Everyday tools that just work
Fast, private calculators, converters and text tools. No signup, no uploads — most things run right in your browser.
Popular
Most usedPercentage Calculator
Quickly find what percent of a number is — instantly, in your browser.
BMI Calculator
Body Mass Index from weight and height, with category.
Tip Calculator
Work out the tip and split the bill between any number of people.
Age Calculator
Exact age in years, months and days from a birth date.
Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
Length Converter
Convert between metric and imperial length units instantly.
Word Counter
Count words, characters, sentences and reading time as you type.
Character Counter
Count characters (with and without spaces), words and lines.
Calculators
47 toolsPercentage Calculator
Quickly find what percent of a number is — instantly, in your browser.
Discount Calculator
See the final price after a discount and how much you save.
Profit Margin Calculator
Turn cost and selling price into profit, margin and markup.
BMI Calculator
Body Mass Index from weight and height, with category.
Age Calculator
Exact age in years, months and days from a birth date.
Loan / Monthly Payment
Estimate a fixed monthly payment from amount, rate and term.
Tip Calculator
Work out the tip and split the bill between any number of people.
Sales Tax / VAT Calculator
Add sales tax or VAT to a price and see the net, tax and gross.
Compound Interest Calculator
See how savings grow with compound interest over time.
Simple Interest Calculator
Calculate simple interest and the total from principal, rate and time.
Percentage Change Calculator
Find the percentage increase or decrease between two values.
Average (Mean) Calculator
Get the average, sum, count, min and max of a list of numbers.
Date Difference Calculator
Count the days, weeks and months between two dates.
Hours Calculator
Find how much time passes between a start and end time.
BMR & Calorie Calculator
Estimate your basal metabolic rate and daily calorie needs.
Fuel Cost Calculator
Estimate the fuel cost of a trip from distance, consumption and price.
ROI Calculator
Calculate return on investment as a percentage from cost and final value.
Unit Price Calculator
Find the price per unit to compare products of different sizes.
Running Pace Calculator
Calculate your running pace per kilometer and your speed.
Aspect Ratio Calculator
Reduce a width and height to its simplest aspect ratio.
Reverse VAT Calculator
Extract the net amount and VAT from a VAT-inclusive (gross) price.
Electricity Cost Calculator
Estimate the running cost of an appliance from its wattage and usage.
Water Intake Calculator
Estimate how much water to drink per day based on your weight.
Leap Year Checker
Check whether any year is a leap year.
Day of the Week Calculator
Find out which weekday any date falls on.
Ideal Weight Calculator
Estimate a reference ideal body weight for your height.
Hourly to Salary Calculator
Convert an hourly wage into weekly, monthly and annual pay.
Break-Even Calculator
Find how many units you must sell to cover your costs.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple of two numbers.
Mortgage Calculator
Estimate the monthly payment on a home loan after a down payment.
Pythagorean Theorem Calculator
Find the hypotenuse of a right triangle from the two legs.
Circle Calculator
Calculate a circle’s area, circumference and diameter from its radius.
Fraction Simplifier
Reduce a fraction to its simplest form, with decimal and percent.
Stacked Discount Calculator
Apply two discounts in sequence and see the real effective discount.
Savings Goal Calculator
See how long it takes to reach a savings target with monthly deposits.
CAGR Calculator
Calculate the compound annual growth rate between two values.
Average Speed Calculator
Calculate average speed from distance and time.
Decimal to Fraction Converter
Convert a decimal number into a simplified fraction.
Grade Calculator
Turn a score into a percentage and letter grade.
Final Grade Calculator
Find the score you need on a final exam to hit your target grade.
Body Fat Calculator (US Navy)
Estimate body fat percentage from tape measurements (US Navy method).
Random Number Generator
Pick a random whole number in a range.
Proportion Calculator (Rule of Three)
Solve a proportion a : b = c : x for the missing value.
Scientific Notation Converter
Convert a number to and from scientific notation.
Days Until a Date (Countdown)
Count down the days from today to any future date.
TDEE Calculator
Estimate your daily calorie needs (Total Daily Energy Expenditure).
Golden Ratio Calculator
Apply the golden ratio (φ ≈ 1.618) to any size.
Converters
25 toolsLength Converter
Convert between metric and imperial length units instantly.
Temperature Converter
Convert Celsius, Fahrenheit and Kelvin in real time.
Weight Converter
Convert between kilograms, pounds, ounces, grams and more.
Speed Converter
Convert km/h, mph, m/s, knots and feet per second.
Area Converter
Convert square meters, acres, hectares, square feet and more.
Volume Converter
Convert liters, milliliters, gallons, cups and fluid ounces.
Data Storage Converter
Convert bits, bytes, KB, MB, GB and TB.
Time Converter
Convert seconds, minutes, hours, days, weeks and years.
Pressure Converter
Convert pascals, bar, psi, atmospheres and mmHg.
Energy Converter
Convert joules, calories, kilocalories, watt-hours and BTU.
Angle Converter
Convert degrees, radians, gradians and turns.
Roman Numeral Converter
Convert a number (1–3999) into Roman numerals.
Height Converter (cm to feet)
Convert a height in centimeters to feet and inches.
Frequency Converter
Convert hertz, kilohertz, megahertz and gigahertz.
Force Converter
Convert newtons, kilonewtons, kilogram-force, pound-force and dynes.
Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
Fuel Economy Converter
Convert between L/100km, km/L, MPG (US) and MPG (UK).
Bandwidth Converter
Convert data rates: bps, Kbps, Mbps, Gbps and Tbps.
Color Converter (HEX, RGB, HSL)
Convert a HEX color to RGB and HSL instantly.
Cooking Measurement Converter
Convert teaspoons, tablespoons, cups, fluid ounces and milliliters.
Roman Numeral to Number
Decode a Roman numeral into a regular number.
PX to REM Converter
Convert pixels to rem (and back) for responsive CSS.
Torque Converter
Convert newton-metres, pound-feet and kilogram-force metres.
Oven Temperature (Gas Mark ↔ °C ↔ °F)
Convert oven temperatures between gas mark, Celsius and Fahrenheit.
Color Contrast Checker (WCAG)
Check the contrast ratio between two colors against WCAG.
Text Tools
37 toolsWord Counter
Count words, characters, sentences and reading time as you type.
Case Converter
Transform text to UPPER, lower, Title and Sentence case.
Slug Generator
Turn any title into a clean, URL-friendly slug.
Text Reverser
Reverse the characters of any text instantly.
Text to Binary
Convert text into 8-bit binary (ASCII) code.
Morse Code Translator
Convert text into International Morse code.
Base64 Encoder
Encode text to Base64 (UTF-8 safe), right in your browser.
URL Encoder
Percent-encode text so it is safe to use inside a URL.
ROT13 Encoder
Apply the classic ROT13 letter-substitution cipher.
Text to Hex
Convert text into hexadecimal (base-16) byte values.
Base64 Decoder
Decode Base64 back into readable UTF-8 text.
Caesar Cipher
Encode or decode text with a Caesar shift cipher.
Character Counter
Count characters (with and without spaces), words and lines.
Reverse Word Order
Reverse the order of words in a sentence (not the letters).
Hex to Text
Decode hexadecimal (base-16) byte values back into text.
URL Decoder
Decode percent-encoded (%20, %26…) text back to readable form.
Binary to Text
Decode 8-bit binary (ASCII) back into readable text.
HTML Encode / Decode
Escape or unescape HTML special characters (&, <, >, ", ’).
NATO Phonetic Alphabet
Spell out text with the NATO phonetic alphabet (Alfa, Bravo, Charlie…).
Lorem Ipsum Generator
Generate placeholder “lorem ipsum” paragraphs for mockups.
JSON Formatter & Validator
Pretty-print and validate JSON, with clear error messages.
Remove Duplicate Lines
Delete repeated lines from a list, keeping the first of each.
Sort Text Lines
Sort a list of lines alphabetically, ascending or descending.
Password Generator
Generate a strong, random password — entirely in your browser.
UUID Generator
Generate random version-4 UUIDs in your browser.
Find and Replace Text
Replace all occurrences of a word or phrase in your text.
Word Frequency Counter
Count how often each word appears in your text.
Dice Roller
Roll any number of dice with any number of sides.
Pig Latin Translator
Turn ordinary English text into playful Pig Latin.
Coin Flip
Flip a virtual coin — heads or tails.
Text Repeater
Repeat a word or phrase any number of times.
Remove Extra Spaces
Clean up text by collapsing extra spaces and blank lines.
QR Code Generator
Create a QR code from any text or link — free and private.
JWT Decoder
Decode the header and payload of a JSON Web Token.
Unix Timestamp Converter
Convert a Unix epoch timestamp to a human-readable date.
CSV to JSON Converter
Convert CSV data into a JSON array of objects.
CSS Gradient Generator
Create a CSS linear-gradient with a live preview.