Chakan

A full-category lookup toolbox for IP addresses, domains, websites, SEO, AI search visibility, text encoding, prompts, and everyday checks.

Muscle group explorer

Pick a muscle area to find useful exercises, or select an exercise to see its primary and secondary muscle activation.

Open tool

Muscle mapHeat zonesExercise picksTraining notes

Popular lookup tools

High-frequency tools with clear intent and strong search demand are prioritized first.

All tools

AI prompt case lookup

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

LookupToolChakan

Muscle group explorer

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

LookupToolChakan

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.

LookupToolChakan

Current IP lookup

View your current public IP address and basic request information.

LookupToolChakan

DNS lookup

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

LookupToolChakan

WHOIS domain lookup

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

LookupToolChakan

IP geolocation lookup

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

LookupToolChakan

IPv4 subnet calculator

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

LookupToolChakan

IPv6 subnet calculator

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

LookupToolChakan

HTTP headers checker

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

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

JSON Schema generator

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

LookupToolChakan

JSON formatter

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

LookupToolChakan

JSON deep diff

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

LookupToolChakan

URL encode and decode

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

LookupToolChakan

Base64 encode and decode

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

LookupToolChakan

Timestamp converter

Use this timestamp converter 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.

LookupToolChakan

Structured data checker

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

LookupToolChakan

Word count

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

LookupToolChakan

Word frequency

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

LookupToolChakan

Keyword density and readability

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

LookupToolChakan

Random number generator

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

LookupToolChakan

Text case converter

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

LookupToolChakan

Fullwidth and halfwidth converter

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

LookupToolChakan

String HEX converter

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

LookupToolChakan

Text replace

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

LookupToolChakan

Text filter

Use this text filter 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.

LookupToolChakan

JSONPath viewer

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

LookupToolChakan

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.

LookupToolChakan

File hash checker

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

LookupToolChakan

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.

LookupToolChakan

YAML and JSON converter

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

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

TOML and JSON converter

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

LookupToolChakan

Base32 and Base58 codec

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

LookupToolChakan

IP number converter

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

LookupToolChakan

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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MIME type lookup

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

LookupToolChakan

Port and protocol lookup

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

LookupToolChakan

Port checker

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

LookupToolChakan

JWT decoder

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

LookupToolChakan

Markdown and HTML viewer

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

LookupToolChakan

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.

LookupToolChakan

PEM certificate parser

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

LookupToolChakan

URL parser

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

LookupToolChakan

HTTP status code lookup

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

LookupToolChakan

Number base converter

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

LookupToolChakan

Factorial calculator

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

LookupToolChakan

Fibonacci sequence generator

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

LookupToolChakan

Prime factorization calculator

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

LookupToolChakan

Fraction calculator

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

LookupToolChakan

Percentage calculator

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

LookupToolChakan

Average and median calculator

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

LookupToolChakan

Variance and standard deviation calculator

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

LookupToolChakan

GCD and LCM calculator

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

LookupToolChakan

Power and root calculator

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

LookupToolChakan

Logarithm calculator

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

LookupToolChakan

Matrix calculator

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

LookupToolChakan

24 game solver

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

LookupToolChakan

Area calculator

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

LookupToolChakan

Perimeter calculator

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

LookupToolChakan

Volume calculator

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

LookupToolChakan

Surface area calculator

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

LookupToolChakan

Trigonometry calculator

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

LookupToolChakan

Quadratic equation solver

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

LookupToolChakan

Linear equation solver

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

LookupToolChakan

Ratio and proportion calculator

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

LookupToolChakan

Two-point geometry calculator

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

LookupToolChakan

Latitude longitude distance calculator

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

LookupToolChakan

Decimal degrees and DMS converter

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

LookupToolChakan

Cartesian and polar converter

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

LookupToolChakan

Coordinate axis order swapper

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

LookupToolChakan

Geohash encoder and decoder

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

LookupToolChakan

NMEA-0183 sentence parser

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

LookupToolChakan

NMEA checksum calculator

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

LookupToolChakan

NTRIP Source-Table parser

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

LookupToolChakan

NTRIP STR line generator

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

LookupToolChakan

Line chart builder

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

LookupToolChakan

Bar chart builder

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

LookupToolChakan

Pie and donut chart builder

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

LookupToolChakan

Scatter chart builder

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

LookupToolChakan

Radar chart builder

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

LookupToolChakan

Funnel chart builder

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

LookupToolChakan

Gauge chart builder

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

LookupToolChakan

Word cloud generator

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

LookupToolChakan

Mermaid diagram preview

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

LookupToolChakan

SVG preview viewer

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

LookupToolChakan

SVG to image converter

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

LookupToolChakan

SVG minifier and cleaner

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

LookupToolChakan

SVG Data URI encoder

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

LookupToolChakan

Aspect ratio and image size calculator

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

LookupToolChakan

Pixel print size and DPI calculator

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

LookupToolChakan

Screen PPI calculator

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

LookupToolChakan

Image color palette extractor

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

LookupToolChakan

Image coordinate and pixel color picker

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

LookupToolChakan

Favicon maker

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

LookupToolChakan

Placeholder image generator

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

LookupToolChakan

Text to image generator

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

LookupToolChakan

Barcode generator

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

LookupToolChakan

Image metadata remover

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

LookupToolChakan

Rounded image generator

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

LookupToolChakan

Gradient background image generator

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

LookupToolChakan

Image information viewer

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

LookupToolChakan

Image resizer

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

LookupToolChakan

Image format converter

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

LookupToolChakan

Image compressor

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

LookupToolChakan

Image cropper

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

LookupToolChakan

Image rotate and flip tool

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

LookupToolChakan

Image watermark tool

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

LookupToolChakan

Batch image compressor

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

LookupToolChakan

Batch image watermark tool

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

LookupToolChakan

ZIP archive viewer

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

LookupToolChakan

ZIP file creator

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

LookupToolChakan

ZIP text preview

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

LookupToolChakan

ZIP file extractor

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

LookupToolChakan

File chunk splitter

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

LookupToolChakan

File chunk merger

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

LookupToolChakan

PDF metadata viewer

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

LookupToolChakan

PDF page splitter

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

LookupToolChakan

PDF file merger

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

LookupToolChakan

Images to PDF converter

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

LookupToolChakan

PDF page numberer

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

LookupToolChakan

PDF text watermark adder

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

LookupToolChakan

PDF metadata editor

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

LookupToolChakan

PDF page remover

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

LookupToolChakan

PDF page reorderer

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

LookupToolChakan

Batch file rename planner

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

LookupToolChakan

Filename cleaner

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

LookupToolChakan

File signature viewer

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

LookupToolChakan

File extension lookup

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

LookupToolChakan

Subtitle format converter

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

LookupToolChakan

Text file splitter

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

LookupToolChakan

File path parser

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

LookupToolChakan

File size converter

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

LookupToolChakan

Unit converter

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

LookupToolChakan

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.

LookupToolChakan

Leap year checker

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

LookupToolChakan

Day of year calculator

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

LookupToolChakan

Workday calculator

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

LookupToolChakan

Countdown day calculator

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

LookupToolChakan

Stopwatch and timer

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

LookupToolChakan

World time converter

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

LookupToolChakan

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.

LookupToolChakan

Mortgage payment calculator

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

LookupToolChakan

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.

LookupToolChakan

Combined mortgage calculator

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

LookupToolChakan

Early mortgage repayment calculator

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

LookupToolChakan

VAT and GST calculator

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

LookupToolChakan

Discount calculator

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

LookupToolChakan

Profit margin calculator

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

LookupToolChakan

Break-even point calculator

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

LookupToolChakan

ROI calculator

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

LookupToolChakan

Target price and margin calculator

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

LookupToolChakan

Simple interest calculator

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

LookupToolChakan

CAGR calculator

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

LookupToolChakan

Unit price comparison calculator

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

LookupToolChakan

Compound interest calculator

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

LookupToolChakan

Savings goal calculator

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

LookupToolChakan

Retirement planning calculator

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

LookupToolChakan

Stock profit calculator

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

LookupToolChakan

Dividend yield calculator

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

LookupToolChakan

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.

LookupToolChakan

Bill split calculator

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

LookupToolChakan

Commission calculator

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

LookupToolChakan

Inflation purchasing power calculator

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

LookupToolChakan

Asset depreciation calculator

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

LookupToolChakan

Payback period calculator

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

LookupToolChakan

Loan cost and APR calculator

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

LookupToolChakan

Loan amortization schedule calculator

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

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

Korean weekly holiday pay calculator

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

LookupToolChakan

Korean severance pay calculator

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

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

RMB uppercase converter

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

LookupToolChakan

China ID checker

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

LookupToolChakan

BMI calculator

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

LookupToolChakan

BMR calculator

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

LookupToolChakan

Body fat estimator

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

LookupToolChakan

Healthy weight range calculator

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

LookupToolChakan

Fuel consumption calculator

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

LookupToolChakan

Shelf life date calculator

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

LookupToolChakan

GPA calculator

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

LookupToolChakan

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.

LookupToolChakan

Sleep cycle calculator

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

LookupToolChakan

Daily water intake calculator

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

LookupToolChakan

Password strength checker

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

LookupToolChakan

Random password generator

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

LookupToolChakan

Cron expression viewer

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

LookupToolChakan

Unicode codec

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

LookupToolChakan

String escape and unescape converter

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

LookupToolChakan

Punycode and UTF-8 viewer

Use this punycode and utf-8 viewer tool to inspect, convert, or generate a clear result directly in your browser.

LookupToolChakan

QR code generator

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

LookupToolChakan

Lunar calendar

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

LookupToolChakan

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.

LookupToolChakan

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.

LookupToolChakan

Date range summary

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

LookupToolChakan

Week number calculator

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

LookupToolChakan

Month calendar viewer

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

LookupToolChakan

Time duration converter

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

LookupToolChakan

Quarter calculator

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

LookupToolChakan

Business hour calculator

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

LookupToolChakan

Date format converter

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

LookupToolChakan

Chinese almanac

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

LookupToolChakan

Menstrual cycle estimator

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

LookupToolChakan

Pregnancy due date estimator

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

LookupToolChakan

Zhougong dream lookup

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

LookupToolChakan

Feng shui study lookup

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

LookupToolChakan

Browse by scenario

Tools are grouped around real lookup jobs instead of a long flat list.