Financial, health, math, and conversion calculators built for precision.
Calculate percentage changes, percentage differences, and value percentages.
Add, subtract, multiply, and divide fractions with instant GCD simplification and decimal conversion.
Perform scientific trigonometry, logarithms, exponentials, factorials, and memory operations.
Calculate exact chronological age in years, months, days, hours, minutes, and seconds.
Calculate the arithmetic average, count, sum, minimum, maximum, and range of any dataset.
Calculate the arithmetic mean (μ) of any dataset with step-by-step summation working.
Find the middle value of an odd or even dataset with automatic ascending sorting.
Identify unimodal, multimodal, or no-mode distributions with frequency tables.
Calculate basic, independent, mutually exclusive, and conditional event probabilities.
Simplify ratios to lowest terms via GCD and solve missing proportion values (A:B = C:X).
Convert decimals to simplified fractions, percentages, binary, hex, and scientific notation.
Perform matrix addition, subtraction, multiplication, transpose, determinants, and inverses.
Solve quadratic equations ax² + bx + c = 0 with real and complex roots, discriminant, and vertex.
Solve linear equations (ax + b = c) and quadratic equations step-by-step.
Calculate population (σ) and sample (s) standard deviation, variance, and mean.
Calculate exact duration in years, months, weeks, days, hours, and seconds between dates.
Add or subtract time durations in hours, minutes, and seconds.
Live ticking countdown timer for future dates, deadlines, and events.
Calculate business days between dates excluding weekends and custom holidays.
Convert time across global time zones, compare current local times, and calculate UTC offsets.
Calculate total cumulative duration across multiple work shifts or time segments.
Calculate concrete volume, premix 60lb/80lb bags needed, and weight for slabs and footings.
Calculate wall area, door/window deductions, paint gallons/liters needed, and can counts.
Calculate floor and wall tile quantities, waste allowances, and box counts.
Calculate room flooring material required with waste allowance and cost estimates.
Calculate roof pitch surface area, roofing squares, shingle bundles, and material cost.
Calculate bricks needed for masonry walls, mortar bags, and waste allowance.
Calculate driveway gravel volume, weight in tons, and dump truckload estimates.
Calculate Voltage (V), Current (I), Resistance (R), and Power (P) using Ohm's Law.
Calculate electric potential difference in Volts from current, resistance, or power.
Calculate electrical power in Watts and kilowatt-hours (kWh) energy consumption.
Decode 4-band and 5-band resistor color rings into resistance value and tolerance.
Calculate electrical Watts and mechanical horsepower (HP) from force, velocity, or torque.
Calculate force using Newton's Second Law (F = m × a) in Newtons, kgf, and lbf.
Calculate rotational torque (τ = F × r × sin θ) in Newton-meters and Pound-feet.
Free online health calculators and wellness tools to help users monitor fitness, nutrition, body measurements, pregnancy, hydration, and overall health.
Calculate your Body Mass Index (BMI) with WHO weight categories and healthy weight range.
Calculate your Basal Metabolic Rate (BMR) and daily calorie burn at rest using Mifflin-St Jeor.
Estimate your body fat percentage and lean body mass using the US Navy formula.
Calculate your ideal body weight across Devine, Hamwi, Miller, and Robinson formulas.
Determine daily calorie intake targets for weight loss, maintenance, or muscle gain.
Calculate your recommended daily water intake based on body weight, exercise, and climate.
Calculate estimated due date, gestational age in weeks and days, and trimester milestones.
Calculate baby due date by LMP, conception date, IVF transfer, or ultrasound scan.
Calculate peak fertile window, estimated ovulation day, and upcoming cycle dates.
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.
Calculate daily protein, carbohydrate, and fat targets in grams for various diet splits.
Length, weight, temperature, area, and volume conversions.
Convert distance measurements between meters, feet, inches, centimeters, kilometers, miles, and yards.
Convert weight and mass between kilograms, pounds, grams, ounces, metric tonnes, and stones.
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.
Convert liquid and 3D volumetric units between liters, milliliters, gallons, cubic meters, and cubic feet.
Convert velocity metrics between km/h, mph, meters per second, and nautical knots.
Convert temporal durations across milliseconds, seconds, minutes, hours, days, weeks, and years.
Convert pneumatic and atmospheric pressure units between PSI, Bar, Pascal, kPa, and Atmospheres.
Convert work and thermal energy metrics between Joules, Calories, Kilocalories, kWh, and BTU.
Convert digital memory sizes between Bits, Bytes, KB, MB, GB, TB, and PB.
Convert culinary recipe measurements between cups, tablespoons, teaspoons, milliliters, and fluid ounces.
Convert frontend CSS font units between pixels (px), REM, and EM with custom base font size.
Convert 160+ world currencies (USD, EUR, GBP, JPY, CAD, INR, etc.) with real-time exchange rates.
Convert blood glucose values between mg/dL (US standard) and mmol/L (International standard).
Convert meters to feet.
Convert inches to cm.
Convert km to miles.
Convert yards to meters.
Convert kg to lbs.
Convert grams to ounces.
Convert tonnes to kg.
Convert Celsius to Fahrenheit.
Convert Fahrenheit to Celsius.
Convert Kelvin to Celsius.
Convert Kelvin to Fahrenheit.
Convert px to rem.
Convert px to em.
Convert rem to em.
JSON formatting, Base64, SQL minifier, and Regex testers.
Format, beautify, inspect, and minify JSON strings with custom indentation.
Format, indent, prettify, and minify XML documents with syntax validation.
Format and clean HTML markup strings with tag indentation.
Format, expand, and minify CSS style rulesets and selectors.
Format JavaScript code with clean indentation and minify JS scripts.
Format SQL queries with uppercase keyword capitalization.
Format, clean, and convert YAML configuration data to JSON.
Validate JSON syntax accuracy with line & column error diagnostics.
Validate XML markup syntax, unclosed tags, and root elements.
Live Markdown editor with split-screen preview and GFM support.
Encode text strings and binary files to Base64 format with UTF-8.
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.
Generate RFC 4122 compliant version-4 UUIDs individually or in bulk.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files.
Calculate 128-bit MD5 message digest checksums.
Generate 256-bit SHA-256 cryptographic hashes for text and files.
Generate cryptographically secure random passwords and passphrases.
Analyze password security strength, Shannon entropy, and vulnerability.
Decode JSON Web Tokens (JWT) to inspect Header, Payload, and signature.
Generate and sign custom JWT tokens using HS256/384/512 algorithms.
Test regular expressions with live match highlighting and replace preview.
Generate regex patterns for Email, Phone, Date, URL, and Credit Card.
Convert Unix timestamps (sec & ms) to ISO 8601, UTC, and relative time.
Generate current system epoch timestamps with live-updating ticker.
Inspect common HTTP headers for Security, CORS, Caching, and Auth.
Search 150+ file extensions and MIME media types by category.
Lookup domain DNS records via DNS-over-HTTPS (A, MX, TXT, CNAME).
Analyze IPv4/IPv6 addresses, private subnets, and CIDR math.
Parse User-Agent strings to detect Browser, OS, Device, Engine, and CPU.
Generate custom QR Codes for Text, URL, WiFi, vCard, and Email with PNG.
Generate 1D barcodes for Code128, EAN-13, UPC-A with PNG and Print.
Convert video files between MP4, MOV, AVI, MKV, WEBM, and FLV formats.
Compress large video files to reduce size for email and web sharing.
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.
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 MP3 or WAV audio tracks from MP4, MOV, or WEBM videos.
Strip and remove soundtrack from video files completely.
Mute video audio tracks instantly with one click.
Generate video thumbnails and contact sheets at specific timestamps.
Convert video segments into animated GIF images.
View video codec, bitrate, frame rate, resolution, and audio details.
Calculate total playlist and video clip runtime durations.
Convert audio files between MP3, WAV, AAC, FLAC, OGG, M4A, and OPUS.
Compress MP3 and audio files by reducing bitrate while preserving sound quality.
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.
Increase and boost low audio volume levels up to 300%.
Apply gradual fade-in and fade-out audio transitions.
Change audio playback tempo and speed without changing pitch.
Inspect audio tags, bitrate, sample rate, and channels.
Visualize audio frequency waveforms and amplitude peaks.
Generate structured SRT and VTT subtitle file frameworks.
Edit subtitle cue text, start times, and end timestamps online.
Shift subtitle timestamps forward or backward to fix out-of-sync audio.
Convert between SRT, WebVTT (.vtt), ASS, and SUB subtitle formats.
Merge multiple subtitle files into a single ordered subtitle track.
Split subtitle documents into multiple time-based files.
View comprehensive media file stream information and container headers.
Calculate recommended streaming bitrates and estimated file sizes.
Calculate video scaling dimensions maintaining aspect ratio.
Calculate 16:9, 4:3, 1:1, 21:9, and custom aspect ratios.
Create compressed ZIP archives from multiple files and folders.
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.
Compress single files using the GZIP compression algorithm (.gz).
Decompress .gz files back to their original state.
Inspect and extract files from 7-Zip (.7z) archives.
Browse directory trees and file compression ratios inside archives.
Split large files into smaller chunks by size, part count, or lines.
Recombine split file parts back into a single original file.
Rename multiple files with prefixes, suffixes, numbering, and search patterns.
Generate ASCII, Markdown, or JSON directory trees from folder paths.
Calculate total folder byte sizes and file counts.
Convert file sizes between Bytes, KB, MB, GB, and TB.
Generate 128-bit MD5 hash checksums for text strings and files.
Generate 160-bit SHA-1 hash values for files and text.
Generate secure 256-bit SHA-256 cryptographic hashes.
Generate ultra-secure 512-bit SHA-512 hashes.
Verify file integrity against an expected MD5 or SHA-256 hash.
Detect file types by reading binary magic byte signatures.
Detect official MIME content types for web server configuration.
View complete file attributes: size, modified date, MIME, and hash.
Find duplicate files in a collection by comparing SHA-256 hashes.
Inspect raw binary file headers and hexadecimal bytes.
Learn and test secure file overwrite and wiping algorithms.
Generate dummy test files of custom size in Binary, Text, or JSON format.
Inspect and translate Unix file permission notation (rwxr-xr-x / 755).
Sanitize filenames by stripping invalid characters and path separators.
Word counter, text case converter, and dummy text generators.
Count words, characters, sentences, paragraphs, reading time, and keyword density in real-time.
Count words, characters, sentences, paragraphs, and reading time in real-time.
Count total characters with and without spaces for social media and limits.
Count total lines, non-empty lines, and blank lines in your code or text.
Count sentences and calculate average sentence length for readability.
Count total paragraphs and block sections in written articles.
Estimate reading time and speaking time for speeches and blog posts.
Analyze keyword frequency and percentage density for SEO optimization.
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 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 leading and trailing whitespace and collapse consecutive spaces.
Strip empty lines and whitespace lines from text documents.
Find and replace text using plain text or regular expressions (RegEx).
Clean text by removing HTML tags, emojis, special characters, and extra spaces.
Generate clean, SEO-friendly URL slugs with custom separators.
Preview how your generated URL slug looks in browser address bars.
Generate placeholder Lorem Ipsum text in words, sentences, or paragraphs.
Generate random paragraphs of mock English text for UI testing.
Generate random alphanumeric strings or test tokens.
Generate bulk lists of random UUID v4 identifiers.
Compare two text documents to highlight added and removed lines inline.
View file differences in a side-by-side split screen diff editor.
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.
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.
Convert Markdown headings, lists, bold text, and code into HTML.
Convert HTML markup into clean Markdown text formatting.
Merge, split, compress, and extract text from PDF documents.
Combine multiple PDF files into one unified document.
Separate PDF pages into individual documents.
Reduce PDF file size while optimizing quality.
Rotate PDF pages 90°, 180°, or 270° clockwise.
Remove unwanted pages from your PDF document.
Rearrange or drag-and-drop PDF pages into custom sequence.
Extract specific pages or page ranges into a new PDF.
Insert header or footer page numbers into PDF.
Stamp custom text or image watermarks onto PDF pages.
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.
Extract tables and data from PDF into Excel (.xlsx).
Convert Excel spreadsheets (.xls, .xlsx) to PDF.
Convert PDF pages into editable PowerPoint (.pptx) slides.
Convert PowerPoint decks (.ppt, .pptx) into PDF files.
Convert PDF pages into PNG, JPEG, or WEBP images.
Combine PNG, JPEG, WEBP images into a single PDF.
Easily convert 161 bytes to megabytes. 161 B = 0.0002 MB. Complete with formula, conversion steps, and benchmark table.
1 B equals
1 B = 9.5367e-7 MB
