All lookup tools

Chakan starts with high-frequency utility checks and keeps expanding toward a full-category lookup platform.

Featured

Muscle group explorer

Find exercises by muscle area, or inspect muscle activation by exercise. This entry is pinned for quick access.

Open

Muscle group explorer

Find exercises by muscle area, or select an exercise to inspect the main and secondary muscle groups.

LookupToolChakan

AI prompt case lookup

Turn a simple need into reusable prompt examples for ChatGPT, Midjourney, Stable Diffusion, FLUX, writing, design, and development.

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Global travel spots and itinerary guide

Look up popular attractions, photo spots, food, local experiences, image and video source links, and simple travel recommendations for countries and cities worldwide.

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Current IP lookup

View your current public IP address and basic request information.

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DNS lookup

Inspect common DNS records such as A, AAAA, CNAME, MX, NS, and TXT.

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WHOIS domain lookup

Inspect public domain registration, registrar, status, dates, and nameserver information.

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IP geolocation lookup

Look up approximate country, region, city, ISP, ASN, and timezone information for IPv4 or IPv6 addresses.

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IPv4 subnet calculator

Calculate network address, broadcast address, host range, wildcard mask, and usable host count for IPv4/CIDR.

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IPv6 subnet calculator

Inspect IPv6 prefix, network range, and address capacity from CIDR notation.

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HTTP headers checker

Use this http headers checker tool to inspect, convert, or generate a clear result directly in your browser.

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Gzip and Brotli compression checker

Check whether a URL response enables gzip, brotli, or related content compression and inspect Vary, cache, and content-type signals.

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User-Agent 解析查看

查看浏览器 User-Agent 字符串里的浏览器、系统、设备类型、渲染引擎和爬虫特征。

User-Agent浏览器爬虫

SEO meta checker

Use this seo meta checker tool to inspect, convert, or generate a clear result directly in your browser.

LookupToolChakan

Hreflang and canonical checker

Check page canonical, hreflang, HTML language, and international SEO consistency.

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Robots and AI crawler checker

Use this robots and ai crawler checker tool to inspect, convert, or generate a clear result directly in your browser.

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JSON Schema generator

Infer a JSON Schema draft from example JSON so you can model payloads, configs, and interface docs faster.

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JSON formatter

Use this json formatter tool to inspect, convert, or generate a clear result directly in your browser.

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JSON deep diff

Use this json deep diff tool to inspect, convert, or generate a clear result directly in your browser.

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URL encode and decode

Use this url encode and decode tool to inspect, convert, or generate a clear result directly in your browser.

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Base64 encode and decode

Use this base64 encode and decode tool to inspect, convert, or generate a clear result directly in your browser.

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Timestamp converter

Use this timestamp converter tool to inspect, convert, or generate a clear result directly in your browser.

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SHA-256 hash viewer

Use this sha-256 hash viewer tool to inspect, convert, or generate a clear result directly in your browser.

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MD5 hash viewer

Use this md5 hash viewer tool to inspect, convert, or generate a clear result directly in your browser.

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SSL certificate checker

Use this ssl certificate checker tool to inspect, convert, or generate a clear result directly in your browser.

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Sitemap checker

Use this sitemap checker tool to inspect, convert, or generate a clear result directly in your browser.

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Structured data checker

Use this structured data checker tool to inspect, convert, or generate a clear result directly in your browser.

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Open Graph checker

Use this open graph checker tool to inspect, convert, or generate a clear result directly in your browser.

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UUID generator

Use this uuid generator tool to inspect, convert, or generate a clear result directly in your browser.

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Text diff viewer

Use this text diff viewer tool to inspect, convert, or generate a clear result directly in your browser.

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Word count

Use this word count tool to inspect, convert, or generate a clear result directly in your browser.

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Word frequency

Use this word frequency tool to inspect, convert, or generate a clear result directly in your browser.

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Keyword density and readability

Measure keyword coverage, density, text structure, and readability signals for content review.

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Regex tester

Use this regex tester tool to inspect, convert, or generate a clear result directly in your browser.

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Text dedupe

Use this text dedupe tool to inspect, convert, or generate a clear result directly in your browser.

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Text sorter

Use this text sorter tool to inspect, convert, or generate a clear result directly in your browser.

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Text extractor

Use this text extractor tool to inspect, convert, or generate a clear result directly in your browser.

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Random number generator

Use this random number generator tool to inspect, convert, or generate a clear result directly in your browser.

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Sequence generator

Use this sequence generator tool to inspect, convert, or generate a clear result directly in your browser.

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Text case converter

Use this text case converter tool to inspect, convert, or generate a clear result directly in your browser.

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Fullwidth and halfwidth converter

Convert fullwidth and halfwidth characters for OCR cleanup, spreadsheet imports, deduplication, and mixed Chinese-English text normalization.

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String HEX converter

Use this string hex converter tool to inspect, convert, or generate a clear result directly in your browser.

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String binary converter

Use this string binary converter tool to inspect, convert, or generate a clear result directly in your browser.

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Text line numbering

Use this text line numbering tool to inspect, convert, or generate a clear result directly in your browser.

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Text replace

Use this text replace tool to inspect, convert, or generate a clear result directly in your browser.

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Text filter

Use this text filter tool to inspect, convert, or generate a clear result directly in your browser.

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Text reverse

Use this text reverse tool to inspect, convert, or generate a clear result directly in your browser.

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Text shuffle

Use this text shuffle tool to inspect, convert, or generate a clear result directly in your browser.

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Join lines

Use this join lines tool to inspect, convert, or generate a clear result directly in your browser.

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JSON5 formatter and validator

Use this json5 formatter and validator tool to inspect, convert, or generate a clear result directly in your browser.

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JSONPath viewer

Use this jsonpath viewer tool to inspect, convert, or generate a clear result directly in your browser.

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JSON to Markdown table converter

Use this json to markdown table converter tool to inspect, convert, or generate a clear result directly in your browser.

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JSON key renamer

Rename JSON keys in bulk with naming-style conversion or custom mapping rules, with nested object and array support.

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JSON Schema validator

Use this json schema validator tool to inspect, convert, or generate a clear result directly in your browser.

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File hash checker

Use this file hash checker tool to inspect, convert, or generate a clear result directly in your browser.

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CRC/BCC/LRC checksum calculator

Use this crc/bcc/lrc checksum calculator tool to inspect, convert, or generate a clear result directly in your browser.

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HMAC calculator

Use this hmac calculator tool to inspect, convert, or generate a clear result directly in your browser.

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YAML and JSON converter

Convert YAML to JSON or JSON to YAML in the browser for configs, API examples, and documentation cleanup.

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XML and JSON converter

Convert XML to JSON or JSON to XML for API responses, legacy data, and configuration inspection.

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CSV and JSON converter

Convert CSV to JSON or JSON to CSV in the browser with delimiter detection, header handling, and preview rows for imports and docs.

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CSV table viewer and validator

Preview CSV as a table and validate delimiter, headers, empty rows, duplicate headers, and uneven column counts in the browser.

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JSONL and JSON converter

Convert JSON Lines to a JSON array or JSON arrays to JSONL in the browser, with per-line validation for logs, datasets, and batch APIs.

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INI and JSON converter

Convert INI to JSON or JSON to INI in the browser with section support, duplicate-key diagnostics, and config cleanup hints.

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TOML and JSON converter

Convert TOML to JSON or JSON to TOML in the browser with table, array, and scalar summaries for config cleanup.

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Base32 and Base58 codec

Encode text to Base32 or Base58, and decode Base32/Base58 values with a HEX byte preview.

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MessagePack and JSON converter

Encode JSON to MessagePack HEX or decode MessagePack HEX back into readable JSON.

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Morse code translator

Translate English letters and numbers to Morse code, or decode Morse code back to text.

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Caesar cipher viewer

Inspect Caesar cipher encryption and decryption with a configurable shift for classical cipher learning.

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Vigenere cipher viewer

Inspect Vigenere cipher encryption and decryption with a keyword for classical cipher learning.

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Basic Auth encoder and decoder

Generate or decode HTTP Basic Authentication headers locally, with a reminder that Basic Auth is not encryption.

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Chmod permission generator

Convert Linux chmod numeric permissions and rwx symbols for server and deployment checks.

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OTP and TOTP generator

Generate a current TOTP code from a Base32 secret locally in the browser for temporary debugging.

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IP number converter

Use this ip number converter tool to inspect, convert, or generate a clear result directly in your browser.

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IPv6 compress and expand

Expand and compress IPv6 addresses to inspect their canonical text representation.

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CIDR aggregation checker

Merge IPv4 CIDR ranges into the smallest equivalent CIDR list for network whitelist cleanup.

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Random IP and MAC generator

Use this random ip and mac generator tool to inspect, convert, or generate a clear result directly in your browser.

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MIME type lookup

Use this mime type lookup tool to inspect, convert, or generate a clear result directly in your browser.

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Port and protocol lookup

Use this port and protocol lookup tool to inspect, convert, or generate a clear result directly in your browser.

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Port checker

Use this port checker tool to inspect, convert, or generate a clear result directly in your browser.

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JWT decoder

Use this jwt decoder tool to inspect, convert, or generate a clear result directly in your browser.

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HTML entity codec

Use this html entity codec tool to inspect, convert, or generate a clear result directly in your browser.

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Markdown and HTML viewer

Use this markdown and html viewer tool to inspect, convert, or generate a clear result directly in your browser.

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SQL formatter

Use this sql formatter tool to inspect, convert, or generate a clear result directly in your browser.

LookupToolChakan

.env formatter

Format .env environment variable text and inspect normalized key/value pairs, duplicates, and suspicious lines.

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PEM certificate parser

Parse PEM X.509 certificate text to inspect subject, issuer, validity, SAN, fingerprints, and chain blocks.

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URL parser

Use this url parser tool to inspect, convert, or generate a clear result directly in your browser.

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HTTP status code lookup

Use this http status code lookup tool to inspect, convert, or generate a clear result directly in your browser.

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Color converter

Use this color converter tool to inspect, convert, or generate a clear result directly in your browser.

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Number base converter

Use this number base converter tool to inspect, convert, or generate a clear result directly in your browser.

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Factorial calculator

Calculate n! exactly with BigInt and inspect the full integer, digit count, and scientific-notation preview.

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Fibonacci sequence generator

Generate a Fibonacci sequence, preview values, and inspect the last number and digit count.

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Prime factorization calculator

Factor an integer into prime factors and exponent notation for quick number theory checks.

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Fraction calculator

Calculate fraction addition, subtraction, multiplication, and division with simplified fraction and decimal output.

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Percentage calculator

Answer common percentage questions such as A percent of B, A as a percent of B, and percent change.

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Average and median calculator

Summarize a number list with count, sum, mean, median, minimum, maximum, and range.

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Variance and standard deviation calculator

Calculate population and sample variance and standard deviation from a number list.

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GCD and LCM calculator

Calculate the greatest common divisor and least common multiple for multiple integers.

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Power and root calculator

Calculate powers, square roots, cube roots, and nth roots with formula output.

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Logarithm calculator

Calculate logarithms with a custom base and compare natural log and common log values.

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Matrix calculator

Calculate matrix addition, subtraction, multiplication, transpose, and determinant from typed matrix rows.

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24 game solver

Search four numbers for arithmetic expressions that make 24 and return copyable solutions.

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Area calculator

Calculate area formulas for rectangles, triangles, circles, trapezoids, parallelograms, and ellipses.

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Perimeter calculator

Calculate perimeter formulas for rectangles, triangles, circles, regular polygons, and ellipses.

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Volume calculator

Calculate volume formulas for boxes, cubes, cylinders, cones, spheres, and pyramids.

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Surface area calculator

Calculate surface area formulas for boxes, cubes, cylinders, cones, and spheres.

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Trigonometry calculator

Convert degrees and radians and calculate sin, cos, tan, cot, sec, and csc values.

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Quadratic equation solver

Solve ax² + bx + c = 0 and inspect the discriminant, real or complex roots, vertex, and formula steps.

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Linear equation solver

Solve ax + b = 0 and inspect the solution, rearrangement steps, and no-solution or identity cases.

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Ratio and proportion calculator

Solve A:B = C:X with cross multiplication for scaling, recipes, ratios, and proportional estimates.

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Two-point geometry calculator

Calculate distance, slope, midpoint, direction angle, and line equation from two Cartesian points.

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Latitude longitude distance calculator

Calculate approximate great-circle distance and initial bearing between two latitude/longitude points.

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Decimal degrees and DMS converter

Convert latitude and longitude between decimal degrees and DMS text with N/S/E/W directions.

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Cartesian and polar converter

Convert between x/y Cartesian coordinates and r/theta polar coordinates with degrees and radians.

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Coordinate axis order swapper

Swap coordinate axis order in batches for lat/lon, lon/lat, and x/y table cleanup.

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Geohash encoder and decoder

Encode latitude/longitude to Geohash or decode a Geohash into its center point and bounding box.

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NMEA-0183 sentence parser

Parse common NMEA-0183 GNSS sentences, checksum status, coordinates, fix quality, speed, and satellite fields.

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NMEA checksum calculator

Calculate and verify the XOR checksum for NMEA-0183 sentences and generate a standard sentence.

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NTRIP Source-Table parser

Parse NTRIP Source-Table STR, CAS, and NET lines for mountpoints, RTCM format, coordinates, authentication, and fee fields.

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NTRIP STR line generator

Generate a copyable NTRIP Source-Table STR line from mountpoint, RTCM, coordinate, authentication, and fee parameters.

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Line chart builder

Generate a local SVG line chart from label/value rows for trend inspection and shareable reports.

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Bar chart builder

Generate a local SVG bar chart from category/value rows for ranking, comparison, and statistics.

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Pie and donut chart builder

Generate a local SVG pie or donut chart and inspect category share, total, and legend values.

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Scatter chart builder

Generate a local SVG scatter chart from x/y rows and inspect distribution, outliers, and correlation.

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Radar chart builder

Generate a local SVG radar chart from dimension scores for product, capability, or option evaluation.

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Funnel chart builder

Generate a local SVG funnel chart and inspect step-by-step and overall conversion rates.

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Gauge chart builder

Generate a local SVG gauge chart from value, min, max, and target for progress or threshold checks.

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Word cloud generator

Generate a local SVG word cloud from pasted text and inspect high-frequency words for reports and keyword summaries.

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Mermaid diagram preview

Render Mermaid flowcharts, sequence diagrams, and state diagrams locally as SVG previews with strict security settings.

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SVG preview viewer

Paste SVG code, clean risky script or external-resource content, and inspect dimensions, element count, and preview.

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SVG to image converter

Convert cleaned SVG code locally into PNG, JPEG, or WebP output with width, height, and quality controls.

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SVG minifier and cleaner

Clean and minify SVG code locally by removing scripts, event handlers, external resources, comments, and extra whitespace.

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SVG Data URI encoder

Generate cleaned SVG Data URI snippets for CSS background images or HTML img tags.

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Aspect ratio and image size calculator

Calculate simplified image ratios, proportional resize dimensions, contain/cover fit sizes, and scale percentages.

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Pixel print size and DPI calculator

Convert image pixels and DPI into printable inch or centimeter sizes, required pixels, and clarity hints.

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Screen PPI calculator

Calculate screen PPI, pixel pitch, physical width and height, and display-density level from resolution and diagonal size.

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Image color palette extractor

Extract average colors, dominant palettes, color shares, and reusable CSS variables from a local image.

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Image coordinate and pixel color picker

Pick an image pixel coordinate locally, inspect HEX/RGBA color values, relative position, and a marked preview.

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Favicon maker

Generate common favicon PNG sizes, HTML snippets, and a web manifest package locally from one image.

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Placeholder image generator

Generate local placeholder images for mockups, covers, ad slots, and layout testing with custom size and colors.

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Text to image generator

Generate local PNG, JPEG, or WebP text cards for social covers, announcements, quotes, and simple posters.

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Barcode generator

Generate local SVG EAN-13, UPC-A, or Code 39 barcodes with checksum status, reusable SVG code, and shareable previews.

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Image metadata remover

Re-export a local image as PNG, JPEG, or WebP to usually remove EXIF, camera, GPS, and source metadata.

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Rounded image generator

Create rounded-corner images locally with radius, padding, background color, format, and quality controls.

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Gradient background image generator

Generate local gradient background images for covers, ads, mockups, and design placeholders.

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Image information viewer

Inspect image file size, type, pixel dimensions, aspect ratio, transparency, and basic color information locally.

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Image resizer

Resize an image locally to a target width and height and export PNG, JPEG, or WebP output.

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Image format converter

Convert images locally between PNG, JPEG, and WebP with quality controls and output preview.

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Image compressor

Compress an image locally with max-width and quality settings and inspect the size reduction.

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Image cropper

Crop an image locally by x, y, width, and height pixel coordinates.

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Image rotate and flip tool

Rotate or flip an image locally and export the transformed PNG, JPEG, or WebP file.

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Image watermark tool

Add a local text watermark to an image with position and opacity controls.

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Batch image compressor

Compress multiple local images by max width, format, and quality, then package the outputs as a downloadable ZIP archive.

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Batch image watermark tool

Add text watermarks to multiple local images and package the processed outputs as a downloadable ZIP archive.

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ZIP archive viewer

Inspect a local ZIP archive for file count, folder count, extension distribution, estimated original size, and entry list.

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ZIP file creator

Select multiple local files and create a downloadable ZIP archive in the browser without uploading anything.

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ZIP text preview

Preview common text files inside a local ZIP archive, including TXT, JSON, CSV, Markdown, XML, HTML, CSS, and JavaScript snippets.

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ZIP file extractor

Extract one matched file from a local ZIP archive in the browser and download it without uploading the archive.

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File chunk splitter

Split a local file into fixed-size chunks and download all parts plus a manifest as a ZIP archive.

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File chunk merger

Merge selected local chunk files into one downloadable file by filename order or selected order.

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PDF metadata viewer

Inspect a local PDF for page count, file size, document metadata, creation and modification dates, and page-size previews.

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PDF page splitter

Extract selected pages from a local PDF by page range and download a new PDF without uploading the file.

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PDF file merger

Merge multiple local PDF files in browser order and download a combined PDF without uploading the source files.

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Images to PDF converter

Convert selected local images into a downloadable PDF with page size, margin, fit mode, and image quality controls.

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PDF page numberer

Add page numbers to a local PDF with position, format, font size, margin, and color controls, then download a new PDF.

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PDF text watermark adder

Add a local text watermark to every page of a PDF with opacity, position, font size, and color controls.

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PDF metadata editor

Update local PDF document metadata such as title, author, subject, keywords, creator, and producer, then download a new PDF.

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PDF page remover

Remove selected pages from a local PDF by page range and download a new PDF without modifying the source file.

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PDF page reorderer

Reorder or duplicate local PDF pages by page order expression and download a new PDF without uploading the source file.

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Batch file rename planner

Select multiple local files and generate a safe rename plan with numbering, case, extension, and CSV export options.

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Filename cleaner

Clean pasted filename lists by removing unsafe characters, normalizing spacing, deduplicating names, and exporting a CSV mapping.

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File signature viewer

Inspect a local file header signature, browser MIME type, extension, and likely real file type without uploading the file.

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File extension lookup

Look up common file extensions, MIME types, format purpose, text/binary nature, related extensions, and handling tips.

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Subtitle format converter

Convert SRT subtitles to WebVTT, WebVTT to SRT, or normalize SRT locally with time offsets and downloadable output.

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Text file splitter

Split pasted text into chunks by line count or character count, then review chunk stats and export chunk mappings.

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File path parser

Parse Windows, POSIX, and URL paths into directory, filename, extension, depth, query parts, and normalized output.

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File size converter

Convert file sizes across SI and IEC units and compare decimal vs binary display values.

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Unit converter

Use this unit converter tool to inspect, convert, or generate a clear result directly in your browser.

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年龄计算与生日查看

输入生日，查看精确年龄、出生星期、下次生日日期和距离生日还有多少天。

年龄生日日期

Japanese era date converter

Convert Gregorian dates and Japanese era dates across Reiwa, Heisei, Showa, Taisho, and Meiji with resume-friendly date text.

LookupToolChakan

Chinese relative title calculator

Look up common Mandarin Chinese kinship titles from a relationship chain such as father’s older sister.

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Leap year checker

Check whether a Gregorian year is a leap year and inspect its February and full-year day counts.

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Day of year calculator

Find the day number, remaining days, quarter, weekday, and leap-year context for a date.

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Workday calculator

Count workdays, weekends, natural days, and manually excluded holidays between two dates.

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Countdown day calculator

Calculate how many days remain until an event date, or how many days have passed.

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Stopwatch and timer

Create a local stopwatch or countdown timer template with a real-time browser timer panel and shareable duration link.

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World time converter

Convert a base date and time across common IANA time zones for meetings, travel, and international coordination.

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Child height estimator

Estimate a child's genetic target adult height range from parent heights, with a clear non-medical disclaimer.

LookupToolChakan

English date formatter

Format a date in common US, UK, long, short, ordinal, weekday, and ISO English date styles.

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Mortgage payment calculator

Estimate monthly payments, total interest, and repayment summaries from loan amount, annual rate, term, and repayment type.

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Housing provident fund mortgage calculator

Estimate monthly payments, total interest, and repayment totals for a housing provident fund mortgage from amount, rate, term, and repayment type.

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Combined mortgage calculator

Estimate a combined commercial and provident-fund mortgage with split principal, split interest, total monthly payment, and total repayment.

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Early mortgage repayment calculator

Compare early mortgage repayment strategies: lower monthly payment versus shorter remaining term, including estimated interest saved.

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VAT and GST calculator

Calculate tax-exclusive price, tax amount, and tax-inclusive total from a manually entered VAT/GST rate.

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Discount calculator

Calculate final price, savings, total price, and discount rate from original price, discount type, and quantity.

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Profit margin calculator

Estimate gross profit, margin rate, markup rate, total revenue, and break-even unit price from cost, price, fees, and quantity.

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Break-even point calculator

Calculate break-even units, target-profit units, contribution margin, and revenue thresholds from fixed cost, unit price, and variable cost.

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ROI calculator

Calculate net profit, ROI, annualized ROI, and payback multiple from investment, final value, income, costs, and holding period.

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Target price and margin calculator

Reverse-calculate target selling price, unit profit, margin, and markup from cost, fees, and target margin or markup rate.

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Simple interest calculator

Calculate simple interest, net interest, maturity amount, and daily yield from principal, annual rate, duration, and interest tax.

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CAGR calculator

Calculate total growth, CAGR, growth multiple, and average annual increase from beginning value, ending value, and years.

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Unit price comparison calculator

Compare two prices by unit cost, cheaper option, unit savings, and equivalent purchase savings.

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Compound interest calculator

Estimate future balance, total contributions, and compounded gains from principal, annual rate, duration, and monthly contributions.

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Savings goal calculator

Estimate the monthly savings required to reach a target amount from current savings, annual return, and timeline.

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Retirement planning calculator

Estimate retirement nest egg target, savings gap, and required monthly contribution from spending, return, inflation, and withdrawal assumptions.

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Stock profit calculator

Calculate stock, ETF, or fund profit and loss from buy price, sell price, quantity, and transaction fees.

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Dividend yield calculator

Calculate dividend yield, annual dividend income, withholding tax, and monthly cash-flow equivalent from manually entered share and dividend assumptions.

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Tip calculator

Calculate tip amount, tax, total payment, per-person amount, and per-person tip from bill amount, tip rate, tax rate, and party size.

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Bill split calculator

Split a bill across people after discounts and service fees, with optional whole-unit rounding and adjustment amount.

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Commission calculator

Calculate commission, total income, effective commission rate, and threshold gap from sales, rate, base salary, threshold, and bonus.

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Inflation purchasing power calculator

Estimate future equivalent cost, cumulative inflation, present purchasing power, and purchasing power loss from amount, inflation rate, and years.

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Asset depreciation calculator

Calculate straight-line asset depreciation, accumulated depreciation, book value, and remaining depreciation from cost, salvage value, useful life, and elapsed years.

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Payback period calculator

Calculate simple and discounted payback period from initial investment, periodic net cash flow, period unit, and discount rate.

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Loan cost and APR calculator

Estimate monthly payments, fees, total borrowing cost, and an approximate APR for consumer, auto, or business loans.

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Loan amortization schedule calculator

Build a monthly loan amortization preview with principal, interest, extra payments, remaining balance, payoff time, and interest saved.

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Debt-to-income ratio calculator

Estimate front-end and back-end debt-to-income ratios from monthly income, housing payment, existing debt, and a planned new payment.

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Salary to hourly wage calculator

Convert annual salary and bonus into monthly, weekly, daily, hourly, and overtime-rate estimates from work hours and paid weeks.

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Korean weekly holiday pay calculator

Estimate Korean weekly holiday pay from hourly wage, weekly hours, scheduled work days, and attendance status.

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Korean severance pay calculator

Estimate Korean severance pay from service dates, monthly salary, annual bonus, and unused annual leave allowance.

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Credit card payoff calculator

Estimate how long it takes to clear a credit card balance from balance, APR, and fixed monthly payment.

LookupToolChakan

US federal income tax estimator 2026

Estimate 2026 US federal individual income tax using IRS standard deduction and progressive tax brackets.

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中国个人所得税综合所得估算查看

按中国个人所得税综合所得年度汇算口径，输入全年收入、专项扣除、专项附加扣除和已预缴税额，估算应纳税额、应补或应退金额。

中国个税所得税税率

Date calculator

Use this date calculator tool to inspect, convert, or generate a clear result directly in your browser.

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RMB uppercase converter

Use this rmb uppercase converter tool to inspect, convert, or generate a clear result directly in your browser.

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China ID checker

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BMI calculator

Use this bmi calculator tool to inspect, convert, or generate a clear result directly in your browser.

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BMR calculator

Estimate basal metabolic rate from sex, age, height, and weight using a common formula.

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Body fat estimator

Estimate body fat percentage from circumference measurements using the US Navy method.

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Healthy weight range calculator

Convert a height into a BMI-based healthy weight range and an approximate BMI 22 reference.

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Fuel consumption calculator

Calculate L/100km, km/L, fuel cost, and cost per kilometer from distance, fuel, and price.

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Shelf life date calculator

Calculate an expiry date and remaining days from production date and shelf-life days.

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GPA calculator

Estimate weighted GPA from course credits and numeric or letter grades.

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TDEE calorie estimator

Estimate BMR and TDEE from sex, age, height, weight, and activity level, then preview maintenance, fat-loss, and muscle-gain calorie targets.

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Sleep cycle calculator

Plan bedtimes or wake-up times from a target clock time, fall-asleep delay, and sleep-cycle length.

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Daily water intake calculator

Estimate daily water intake from body weight, activity minutes, and climate adjustment with cup and reminder ranges.

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Password strength checker

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Random password generator

Generate a secure random password or a memorable passphrase with configurable length, numbers, and symbols in your browser.

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Cron expression viewer

Use this cron expression viewer tool to inspect, convert, or generate a clear result directly in your browser.

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Unicode codec

Use this unicode codec tool to inspect, convert, or generate a clear result directly in your browser.

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String escape and unescape converter

Escape or unescape strings for JSON, JavaScript, HTML, regex, SQL, and CSV contexts locally in the browser.

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Punycode and UTF-8 viewer

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QR code generator

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Lunar calendar

Use this lunar calendar tool to inspect, convert, or generate a clear result directly in your browser.

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Lunar to solar date converter

Convert a Chinese lunar calendar date, including leap months, into its Gregorian date with zodiac, heavenly stems, earthly branches, and solar term context.

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24 solar terms lookup

View the 24 Chinese solar terms for a year and inspect the previous, current, and next solar term around a selected date.

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Date range summary

Summarize a date range with inclusive days, days between, weekdays, weekends, full weeks, month coverage, and weekday distribution.

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Week number calculator

Look up ISO week number, week-year, weekday index, week start and end dates for a Gregorian date.

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Month calendar viewer

Generate a month calendar with week rows, weekdays, weekends, ISO week labels, and date details.

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Time duration converter

Convert days, hours, minutes, seconds, and milliseconds into total units and a normalized human-readable duration.

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Quarter calculator

Find the calendar quarter for a date, quarter start and end dates, progress, remaining days, and next quarter.

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Business hour calculator

Calculate working minutes and hours between two date-times using a weekday schedule and daily work window.

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Date format converter

Convert a local date and time into ISO, UTC, Chinese, slash, compact, Unix timestamp, and RFC 3339 formats.

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Chinese almanac

View Chinese almanac information with a structured layout for lunar date, suitable activities, and cautions.

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Bazi entertainment lookup

Use this bazi entertainment lookup tool to inspect, convert, or generate a clear result directly in your browser.

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Zodiac lookup

Use this zodiac lookup tool to inspect, convert, or generate a clear result directly in your browser.

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Menstrual cycle estimator

Use this menstrual cycle estimator tool to inspect, convert, or generate a clear result directly in your browser.

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Pregnancy due date estimator

Use this pregnancy due date estimator tool to inspect, convert, or generate a clear result directly in your browser.

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Zhougong dream lookup

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Feng shui study lookup

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