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Calculators

Financial, health, math, and conversion calculators built for precision.

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Percentage CalculatorHot

Calculate percentage changes, percentage differences, and value percentages.

Fraction CalculatorHot

Add, subtract, multiply, and divide fractions with instant GCD simplification and decimal conversion.

Scientific CalculatorHot

Perform scientific trigonometry, logarithms, exponentials, factorials, and memory operations.

Age CalculatorHot

Calculate exact chronological age in years, months, days, hours, minutes, and seconds.

Average CalculatorHot

Calculate the arithmetic average, count, sum, minimum, maximum, and range of any dataset.

Mean Calculator

Calculate the arithmetic mean (μ) of any dataset with step-by-step summation working.

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Median Calculator

Find the middle value of an odd or even dataset with automatic ascending sorting.

Mode Calculator

Identify unimodal, multimodal, or no-mode distributions with frequency tables.

Probability CalculatorHot

Calculate basic, independent, mutually exclusive, and conditional event probabilities.

Ratio Calculator

Simplify ratios to lowest terms via GCD and solve missing proportion values (A:B = C:X).

Decimal Calculator

Convert decimals to simplified fractions, percentages, binary, hex, and scientific notation.

Matrix CalculatorHot

Perform matrix addition, subtraction, multiplication, transpose, determinants, and inverses.

Quadratic Equation CalculatorHot

Solve quadratic equations ax² + bx + c = 0 with real and complex roots, discriminant, and vertex.

Equation SolverHot

Solve linear equations (ax + b = c) and quadratic equations step-by-step.

Standard Deviation CalculatorHot

Calculate population (σ) and sample (s) standard deviation, variance, and mean.

Date Difference CalculatorHot

Calculate exact duration in years, months, weeks, days, hours, and seconds between dates.

Time CalculatorHot

Add or subtract time durations in hours, minutes, and seconds.

Countdown CalculatorHot

Live ticking countdown timer for future dates, deadlines, and events.

Working Days Calculator

Calculate business days between dates excluding weekends and custom holidays.

Time Zone CalculatorHot

Convert time across global time zones, compare current local times, and calculate UTC offsets.

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Duration Calculator

Calculate total cumulative duration across multiple work shifts or time segments.

Concrete CalculatorHot

Calculate concrete volume, premix 60lb/80lb bags needed, and weight for slabs and footings.

Paint CalculatorHot

Calculate wall area, door/window deductions, paint gallons/liters needed, and can counts.

Tile CalculatorHot

Calculate floor and wall tile quantities, waste allowances, and box counts.

Flooring Calculator

Calculate room flooring material required with waste allowance and cost estimates.

Roofing CalculatorHot

Calculate roof pitch surface area, roofing squares, shingle bundles, and material cost.

Brick Calculator

Calculate bricks needed for masonry walls, mortar bags, and waste allowance.

Gravel Calculator

Calculate driveway gravel volume, weight in tons, and dump truckload estimates.

Ohm's Law CalculatorHot

Calculate Voltage (V), Current (I), Resistance (R), and Power (P) using Ohm's Law.

Voltage Calculator

Calculate electric potential difference in Volts from current, resistance, or power.

Watt CalculatorHot

Calculate electrical power in Watts and kilowatt-hours (kWh) energy consumption.

Resistor Color Code CalculatorHot

Decode 4-band and 5-band resistor color rings into resistance value and tolerance.

Power Calculator

Calculate electrical Watts and mechanical horsepower (HP) from force, velocity, or torque.

Force Calculator

Calculate force using Newton's Second Law (F = m × a) in Newtons, kgf, and lbf.

Torque CalculatorHot

Calculate rotational torque (τ = F × r × sin θ) in Newton-meters and Pound-feet.

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Health Calculators

Free online health calculators and wellness tools to help users monitor fitness, nutrition, body measurements, pregnancy, hydration, and overall health.

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BMI CalculatorHot

Calculate your Body Mass Index (BMI) with WHO weight categories and healthy weight range.

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BMR CalculatorHot

Calculate your Basal Metabolic Rate (BMR) and daily calorie burn at rest using Mifflin-St Jeor.

Body Fat CalculatorHot

Estimate your body fat percentage and lean body mass using the US Navy formula.

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Ideal Weight Calculator

Calculate your ideal body weight across Devine, Hamwi, Miller, and Robinson formulas.

Calorie CalculatorHot

Determine daily calorie intake targets for weight loss, maintenance, or muscle gain.

Water Intake CalculatorHot

Calculate your recommended daily water intake based on body weight, exercise, and climate.

Pregnancy CalculatorHot

Calculate estimated due date, gestational age in weeks and days, and trimester milestones.

Due Date Calculator

Calculate baby due date by LMP, conception date, IVF transfer, or ultrasound scan.

Ovulation CalculatorHot

Calculate peak fertile window, estimated ovulation day, and upcoming cycle dates.

Heart Rate Calculator

Calculate max heart rate and target exercise training zones using the Karvonen method.

Calculate Blood Alcohol Content (BAC %) and estimated hours to reach 0.00% sobriety.

Macro CalculatorHot

Calculate daily protein, carbohydrate, and fat targets in grams for various diet splits.

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Unit Converters

Length, weight, temperature, area, and volume conversions.

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Length ConverterHot

Convert distance measurements between meters, feet, inches, centimeters, kilometers, miles, and yards.

Weight & Mass ConverterHot

Convert weight and mass between kilograms, pounds, grams, ounces, metric tonnes, and stones.

Temperature ConverterHot

Convert thermal scale values between Celsius (°C), Fahrenheit (°F), and Kelvin (K).

Convert surface areas between square meters, square feet, acres, hectares, and square miles.

Volume Converter

Convert liquid and 3D volumetric units between liters, milliliters, gallons, cubic meters, and cubic feet.

Speed Converter

Convert velocity metrics between km/h, mph, meters per second, and nautical knots.

Time Unit Converter

Convert temporal durations across milliseconds, seconds, minutes, hours, days, weeks, and years.

Pressure Converter

Convert pneumatic and atmospheric pressure units between PSI, Bar, Pascal, kPa, and Atmospheres.

Energy & Work Converter

Convert work and thermal energy metrics between Joules, Calories, Kilocalories, kWh, and BTU.

Digital Storage Converter

Convert digital memory sizes between Bits, Bytes, KB, MB, GB, TB, and PB.

Cooking Volume Converter

Convert culinary recipe measurements between cups, tablespoons, teaspoons, milliliters, and fluid ounces.

Typography & PX/REM Converter

Convert frontend CSS font units between pixels (px), REM, and EM with custom base font size.

Live Currency ConverterHot

Convert 160+ world currencies (USD, EUR, GBP, JPY, CAD, INR, etc.) with real-time exchange rates.

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Blood Sugar (Glucose) Converter

Convert blood glucose values between mg/dL (US standard) and mmol/L (International standard).

Meters to Feet Converter

Convert meters to feet.

Inches to Centimeters Converter

Convert inches to cm.

Kilometers to Miles Converter

Convert km to miles.

Yards to Meters Converter

Convert yards to meters.

Kilograms to Pounds Converter

Convert kg to lbs.

Grams to Ounces Converter

Convert grams to ounces.

Metric Tonnes to Kilograms Converter

Convert tonnes to kg.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit.

Fahrenheit to Celsius Converter

Convert Fahrenheit to Celsius.

Kelvin to Celsius Converter

Convert Kelvin to Celsius.

Kelvin to Fahrenheit Converter

Convert Kelvin to Fahrenheit.

PX to REM Converter

Convert px to rem.

PX to EM Converter

Convert px to em.

REM to EM Converter

Convert rem to em.

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Dev Tools

JSON formatting, Base64, SQL minifier, and Regex testers.

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JSON Formatter & PrettifierHot

Format, beautify, inspect, and minify JSON strings with custom indentation.

XML Formatter & BeautifierHot

Format, indent, prettify, and minify XML documents with syntax validation.

HTML Formatter & Prettifier

Format and clean HTML markup strings with tag indentation.

CSS Formatter & Minifier

Format, expand, and minify CSS style rulesets and selectors.

JavaScript Formatter & MinifierHot

Format JavaScript code with clean indentation and minify JS scripts.

SQL Query FormatterHot

Format SQL queries with uppercase keyword capitalization.

YAML Formatter & Prettifier

Format, clean, and convert YAML configuration data to JSON.

JSON Syntax & Schema ValidatorHot

Validate JSON syntax accuracy with line & column error diagnostics.

XML Syntax Validator

Validate XML markup syntax, unclosed tags, and root elements.

Markdown Live Editor & PreviewHot

Live Markdown editor with split-screen preview and GFM support.

Base64 EncoderHot

Encode text strings and binary files to Base64 format with UTF-8.

Base64 DecoderHot

Decode Base64 encoded strings back to original UTF-8 text.

Encode URI components and Unicode characters according to RFC 3986.

Decode percent-encoded URL parameters and URI strings.

UUID Generator (v4)Hot

Generate RFC 4122 compliant version-4 UUIDs individually or in bulk.

Hash Generator (MD5, SHA256, SHA512)Hot

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files.

MD5 Hash Generator

Calculate 128-bit MD5 message digest checksums.

SHA-256 Hash Generator

Generate 256-bit SHA-256 cryptographic hashes for text and files.

Secure Password GeneratorHot

Generate cryptographically secure random passwords and passphrases.

Password Strength & Entropy CheckerHot

Analyze password security strength, Shannon entropy, and vulnerability.

JWT Token Decoder & InspectorHot

Decode JSON Web Tokens (JWT) to inspect Header, Payload, and signature.

JWT Token Generator & SignerHot

Generate and sign custom JWT tokens using HS256/384/512 algorithms.

Regular Expression Tester & DebuggerHot

Test regular expressions with live match highlighting and replace preview.

Structured Regex GeneratorHot

Generate regex patterns for Email, Phone, Date, URL, and Credit Card.

Unix Timestamp ConverterHot

Convert Unix timestamps (sec & ms) to ISO 8601, UTC, and relative time.

Unix Timestamp Generator & TickerHot

Generate current system epoch timestamps with live-updating ticker.

HTTP Header Viewer & Reference

Inspect common HTTP headers for Security, CORS, Caching, and Auth.

MIME Type & File Extension Lookup

Search 150+ file extensions and MIME media types by category.

DNS Record Lookup ToolHot

Lookup domain DNS records via DNS-over-HTTPS (A, MX, TXT, CNAME).

IP Address & CIDR Subnet LookupHot

Analyze IPv4/IPv6 addresses, private subnets, and CIDR math.

User Agent Parser & DetectorHot

Parse User-Agent strings to detect Browser, OS, Device, Engine, and CPU.

QR Code GeneratorHot

Generate custom QR Codes for Text, URL, WiFi, vCard, and Email with PNG.

Barcode GeneratorHot

Generate 1D barcodes for Code128, EAN-13, UPC-A with PNG and Print.

Video ConverterHot

Convert video files between MP4, MOV, AVI, MKV, WEBM, and FLV formats.

Video CompressorHot

Compress large video files to reduce size for email and web sharing.

Video TrimmerHot

Trim and cut start and end points of your video clips.

Crop video dimensions to 16:9, 9:16, 1:1, or custom crop boundaries.

Rotate sideways videos by 90, 180, or 270 degrees.

Resize video dimensions to 1080p Full HD, 720p HD, 480p, or 360p.

Video Speed Controller

Speed up or slow down video playback from 0.25x to 4x speed.

Merge and combine multiple video clips into a single video file.

Split long videos into smaller parts by timestamp or fixed durations.

Extract Audio From VideoHot

Extract MP3 or WAV audio tracks from MP4, MOV, or WEBM videos.

Remove Audio From Video

Strip and remove soundtrack from video files completely.

Mute video audio tracks instantly with one click.

Video Thumbnail Generator

Generate video thumbnails and contact sheets at specific timestamps.

Convert video segments into animated GIF images.

Video Metadata Viewer

View video codec, bitrate, frame rate, resolution, and audio details.

Video Duration Calculator

Calculate total playlist and video clip runtime durations.

Audio ConverterHot

Convert audio files between MP3, WAV, AAC, FLAC, OGG, M4A, and OPUS.

Audio Compressor

Compress MP3 and audio files by reducing bitrate while preserving sound quality.

Audio TrimmerHot

Trim, cut, and slice MP3 audio files with waveform visualization.

Merge and combine multiple audio files into a single track.

Split audio files into equal parts or custom tracks.

Volume BoosterHot

Increase and boost low audio volume levels up to 300%.

Fade In / Fade Out

Apply gradual fade-in and fade-out audio transitions.

Audio Speed Changer

Change audio playback tempo and speed without changing pitch.

Audio Metadata Viewer

Inspect audio tags, bitrate, sample rate, and channels.

Waveform ViewerHot

Visualize audio frequency waveforms and amplitude peaks.

Subtitle Generator FrameworkHot

Generate structured SRT and VTT subtitle file frameworks.

Subtitle Editor

Edit subtitle cue text, start times, and end timestamps online.

Subtitle Synchroniser

Shift subtitle timestamps forward or backward to fix out-of-sync audio.

Subtitle Format ConverterHot

Convert between SRT, WebVTT (.vtt), ASS, and SUB subtitle formats.

Subtitle Merger

Merge multiple subtitle files into a single ordered subtitle track.

Subtitle Splitter

Split subtitle documents into multiple time-based files.

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Media Information Viewer

View comprehensive media file stream information and container headers.

Bitrate CalculatorHot

Calculate recommended streaming bitrates and estimated file sizes.

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Resolution Calculator

Calculate video scaling dimensions maintaining aspect ratio.

Aspect Ratio CalculatorHot

Calculate 16:9, 4:3, 1:1, 21:9, and custom aspect ratios.

Create compressed ZIP archives from multiple files and folders.

ZIP ExtractorHot

Extract and unzip files from ZIP archives in your browser.

Create TAR archives for Linux and Unix server backups.

Extract files from .tar archive packages.

GZIP CompressorHot

Compress single files using the GZIP compression algorithm (.gz).

Decompress .gz files back to their original state.

7Z Extractor Framework

Inspect and extract files from 7-Zip (.7z) archives.

Archive ViewerHot

Browse directory trees and file compression ratios inside archives.

File SplitterHot

Split large files into smaller chunks by size, part count, or lines.

Recombine split file parts back into a single original file.

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Batch File RenamerHot

Rename multiple files with prefixes, suffixes, numbering, and search patterns.

Directory Tree GeneratorHot

Generate ASCII, Markdown, or JSON directory trees from folder paths.

Folder Size Estimator

Calculate total folder byte sizes and file counts.

File Size Calculator

Convert file sizes between Bytes, KB, MB, GB, and TB.

MD5 GeneratorHot

Generate 128-bit MD5 hash checksums for text strings and files.

SHA-1 Generator

Generate 160-bit SHA-1 hash values for files and text.

SHA-256 GeneratorHot

Generate secure 256-bit SHA-256 cryptographic hashes.

SHA-512 Generator

Generate ultra-secure 512-bit SHA-512 hashes.

File Integrity CheckerHot

Verify file integrity against an expected MD5 or SHA-256 hash.

File Type DetectorHot

Detect file types by reading binary magic byte signatures.

MIME Type Detector

Detect official MIME content types for web server configuration.

File Metadata Viewer

View complete file attributes: size, modified date, MIME, and hash.

Duplicate File DetectorHot

Find duplicate files in a collection by comparing SHA-256 hashes.

Binary File Inspector

Inspect raw binary file headers and hexadecimal bytes.

Secure File WiperHot

Learn and test secure file overwrite and wiping algorithms.

Random File Generator

Generate dummy test files of custom size in Binary, Text, or JSON format.

File Permission Viewer

Inspect and translate Unix file permission notation (rwxr-xr-x / 755).

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File Name Sanitizer

Sanitize filenames by stripping invalid characters and path separators.

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Text Tools

Word counter, text case converter, and dummy text generators.

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Word CounterHot

Count words, characters, sentences, paragraphs, reading time, and keyword density in real-time.

Word CounterHot

Count words, characters, sentences, paragraphs, and reading time in real-time.

Character CounterHot

Count total characters with and without spaces for social media and limits.

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Count total lines, non-empty lines, and blank lines in your code or text.

Sentence Counter

Count sentences and calculate average sentence length for readability.

Paragraph Counter

Count total paragraphs and block sections in written articles.

Reading Time Calculator

Estimate reading time and speaking time for speeches and blog posts.

Keyword Density Checker

Analyze keyword frequency and percentage density for SEO optimization.

Case ConverterHot

Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.

Reverse text character by character, word by word, or line by line.

Remove Duplicate LinesHot

Remove duplicate lines from text files or lists while preserving unique entries.

Sort lines alphabetically, numerically, or in reverse order.

Randomly shuffle lines of text or lists for randomized sampling.

Trim Whitespace

Trim leading and trailing whitespace and collapse consecutive spaces.

Remove Blank Lines

Strip empty lines and whitespace lines from text documents.

Find & ReplaceHot

Find and replace text using plain text or regular expressions (RegEx).

Clean text by removing HTML tags, emojis, special characters, and extra spaces.

Slug GeneratorHot

Generate clean, SEO-friendly URL slugs with custom separators.

URL Slug Preview

Preview how your generated URL slug looks in browser address bars.

Lorem Ipsum GeneratorHot

Generate placeholder Lorem Ipsum text in words, sentences, or paragraphs.

Random Text Generator

Generate random paragraphs of mock English text for UI testing.

Random String Generator

Generate random alphanumeric strings or test tokens.

UUID List Generator

Generate bulk lists of random UUID v4 identifiers.

Text Diff CheckerHot

Compare two text documents to highlight added and removed lines inline.

Side-by-Side Diff Viewer

View file differences in a side-by-side split screen diff editor.

CSV Viewer & TableHot

View, filter, sort, search, and paginate CSV files in a data table.

Convert CSV spreadsheets into formatted JSON array of objects.

Convert JSON array of objects into downloadable CSV spreadsheets.

Convert tab-separated values (TSV) into comma-separated values (CSV).

Convert comma-separated values (CSV) into tab-separated values (TSV).

Parse XML documents into formatted JSON structure.

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Convert JSON objects into structured XML documents.

Strip HTML tags and convert web pages into clean plain text.

Convert plain text paragraphs into formatted HTML markup.

Markdown to HTMLHot

Convert Markdown headings, lists, bold text, and code into HTML.

HTML to Markdown

Convert HTML markup into clean Markdown text formatting.

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PDF Tools

Merge, split, compress, and extract text from PDF documents.

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Combine multiple PDF files into one unified document.

Separate PDF pages into individual documents.

Compress PDFHot

Reduce PDF file size while optimizing quality.

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Rotate PDF pages 90°, 180°, or 270° clockwise.

Delete PDF Pages

Remove unwanted pages from your PDF document.

Reorder PDF Pages

Rearrange or drag-and-drop PDF pages into custom sequence.

Extract PDF Pages

Extract specific pages or page ranges into a new PDF.

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Add Page Numbers

Insert header or footer page numbers into PDF.

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Watermark PDFHot

Stamp custom text or image watermarks onto PDF pages.

PDF Metadata Editor

View and edit PDF Title, Author, Subject, Keywords, Creator.

Convert PDF documents into editable Word (.docx) files.

Convert Word (.doc, .docx) files into clean PDF documents.

PDF to ExcelHot

Extract tables and data from PDF into Excel (.xlsx).

Convert Excel spreadsheets (.xls, .xlsx) to PDF.

PDF to PowerPoint

Convert PDF pages into editable PowerPoint (.pptx) slides.

PowerPoint to PDF

Convert PowerPoint decks (.ppt, .pptx) into PDF files.

PDF to ImagesHot

Convert PDF pages into PNG, JPEG, or WEBP images.

Images to PDFHot

Combine PNG, JPEG, WEBP images into a single PDF.

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Home Developer ToolsJWT Token Generator & Signer

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JWT Token Generator & Signer

Generate and sign custom JSON Web Tokens (JWT) using HS256, HS384, or HS512 HMAC algorithms.

Signing Algorithm

Secret Key / Passphrase

Quick Claim Injectors

Payload Claims (JSON)

json(191 chars, 1 lines)

1

Generated Signed JWT Token

Signed Token Output

How to Use JWT Token Generator & Signer

1

Input Data

Paste your raw text, code, or upload a file into the interactive editor above.

2

Instant Execution

Our browser engine processes, formats, validates, or encodes your input in real-time.

3

Export & Copy

Copy the computed result directly to your clipboard or download it as a local file.

Frequently Asked Questions

Which algorithms are supported?expand_more

Supports HMAC SHA-256 (HS256), HMAC SHA-384 (HS384), and HMAC SHA-512 (HS512).

100% Client-Side Session

All transformations and calculations are executed securely within your web browser. No input data is sent to external servers.

Related Developer Tools

Hash Generator (MD5, SHA256, SHA512)

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files.

JWT Token Decoder & Inspector

Decode JSON Web Tokens (JWT) to inspect Header, Payload, and signature.