Useful tools for everyday tasks.

Percentage Calculator

Calculate percentages, compare values, percentage change and discounts.

Age Calculator

Calculate your exact age from your date of birth.

Date Difference Calculator

Find the number of days, weeks and approximate months between two dates.

Time Duration Calculator

Calculate elapsed time between two times, including an optional break.

Unit Converter

Convert common units of length, weight, temperature, volume and more.

Rounding Calculator

Round to decimal places, the nearest 10, 100 or 1,000, or significant figures.

Scientific Notation Converter

Convert numbers to and from scientific, E and engineering notation.

cm to Inches Converter

Convert between centimetres and inches, with tape-measure fractions.

Grams to Cups Converter

Convert flour, sugar, butter and more between grams and cups.

Military Time Converter

Convert 24-hour time to 12-hour am/pm time and back.

Lotto Number Generator

Random numbers for SA Lotto, PowerBall, EuroMillions and more, with the odds.

Random Team Generator

Split a list of names into random, evenly sized teams.

Text to Speech

Hear any text read aloud with your device’s voices.

Screen Resolution Checker

See your screen resolution, pixel ratio and browser window size.

QR Code Generator

Make a free QR code for a link or text and download PNG or SVG.

Working Days Calculator

Count working days between two dates, skipping weekends and South African public holidays.

Week Number Calculator

Find the ISO week number of any date, and the dates of any week.

Pomodoro Timer

Focus in 25-minute blocks with short and long breaks, timed for you.

Tally Counter

Count up or down with a tap, in any step, towards a target.

Spin the Wheel

Type names or options and spin a fair wheel to pick one.

Square Root Calculator

Square roots, cube roots and nth roots, with the simplified radical.

Exponent Calculator

Raise any number to a power, with every digit of big results.

PX to REM Converter

Convert CSS pixels to rem and back for any root font size.

CSS Gradient Generator

Make linear, radial and conic CSS gradients with a live preview.

Number Base Converter

Convert whole numbers between binary, octal, decimal, hex and any base to 36.

Height Converter

Convert height between centimetres and feet and inches.

kg to lbs Converter

Convert weight between kilograms, pounds and stones.

Celsius to Fahrenheit Converter

Convert temperatures between °C, °F and Kelvin.

km to Miles Converter

Convert distance between kilometres and miles.

mph to km/h Converter

Convert speed between mph, km/h, m/s and knots.

Feet to Metres Converter

Convert length between feet and metres.

Square Metres to Square Feet Converter

Convert floor area between m², ft², square yards and hectares.

Litres to Gallons Converter

Convert volume between litres and US and UK gallons.

mm to Inches Converter

Convert between millimetres and inches, with tape-measure fractions.

Acres to Hectares Converter

Convert land area between acres, hectares and square metres.

ml to fl oz Converter

Convert millilitres to US and UK fluid ounces.

MB to GB Converter

Convert MB to GB, with the binary GiB your computer shows.

Random Number Generator

Generate a random number within any range.

Password Generator

Generate strong random passwords in your browser.

Word Counter

Count words, characters, sentences and lines in your text.

Character Counter

Count characters with and without spaces.

Case Converter

Convert text to upper case, lower case, title case and sentence case.

Duplicate Line Remover

Remove duplicate lines from a block of text.

Line Sorter

Sort lines alphabetically or numerically.

Whitespace Cleaner

Clean extra spaces, blank lines and trailing whitespace.

Text Reverser

Reverse text, words or the order of lines.

JSON Formatter

Format, validate and minify JSON directly in your browser.

Base64 Encoder & Decoder

Encode or decode Base64 text in your browser.

URL Encoder & Decoder

Encode or decode URL text safely.

UUID Generator

Generate UUID v4 identifiers in your browser.

Image Resizer

Resize images in your browser and download the result.

Image Compressor

Compress JPEG and WebP images in your browser.

Color Converter

Convert between HEX and RGB colour values.

Lorem Ipsum Generator

Generate placeholder text for designs and prototypes.

Coin Flip

Flip a virtual coin instantly.

Dice Roller

Roll one or more six-sided dice.

Tip Calculator

Calculate a tip and split a bill between people.

Average Calculator

Calculate the mean average of a list of numbers.

Ratio Calculator

Simplify ratios and calculate proportional values.

Online Timer and Stopwatch

A countdown timer with an alarm, and a stopwatch with lap times.

Days Until Calculator

Count the days until (or since) any date, with weeks, weekdays and hours.

Roman Numeral Converter

Convert numbers to Roman numerals, or Roman numerals back to numbers.

Number to Words Converter

Write numbers out in words, with cheque-style wording for amounts.

Grade Calculator

Turn a test or assignment score into a percentage and a letter grade.

Fraction Calculator

Add, subtract, multiply or divide fractions and mixed numbers, with the working shown.

Scientific Calculator

A free scientific calculator with trigonometry, powers, roots, logarithms and brackets.

Time Zone Converter

Convert a date and time from one time zone and see it in cities around the world.

BMI Calculator

Work out your body mass index (BMI) and the healthy weight range for your height.

GPA Calculator

Calculate your grade point average on the 4.0 scale from letter grades and credits.

Typing Speed Test

Find your typing speed in words per minute (WPM) and your accuracy.

Calorie Calculator

Estimate how many calories you burn each day, and how many to eat to lose or gain weight.

Standard Deviation Calculator

Paste a list of numbers to get the standard deviation, variance, mean and median.

GCD and LCM Calculator

Find the greatest common divisor and least common multiple of two or more whole numbers.

Prime Factorization Calculator

Check whether a number is prime and break it down into its prime factors.

Pace Calculator

Work out your running pace and speed from a distance and a time, with race-time predictions.

Sleep Calculator

Find when to go to bed, or when to wake up, so your alarm falls at the end of a sleep cycle.

Slug Generator

Turn a title or any text into a clean, lowercase URL slug for a web page or blog post.

Morse Code Translator

Translate text into Morse code, or paste dots and dashes to turn them back into text.

Hash Generator

Generate SHA-256, SHA-1, SHA-384 and SHA-512 hashes of text, right in your browser.

Buy Now, Pay Later Calculator

See each instalment and its due date, and what a missed payment would really cost.

Area Calculator

Find the area and perimeter of common shapes, with the answer in square metres and square feet.

Quadratic Equation Solver

Solve ax² + bx + c = 0 and see the discriminant, the roots and the vertex.

Speed, Distance and Time Calculator

Find the speed, distance or travel time when you know the other two.

Electricity Cost Calculator

See what an appliance costs to run each day, month and year.

Due Date Calculator

Estimate your due date and see how many weeks pregnant you are today.

Word Frequency Counter

Count how often each word appears and find the most used words in any text.

JWT Decoder

Decode a JSON Web Token to read its header, payload and expiry time.

Regex Tester

Test a regular expression, see every match and preview a replacement.

Text Compare

Paste two versions of a text to see exactly which lines changed.

Volume Calculator

Find the volume and surface area of common 3D shapes, with litres and gallons.

Body Fat Calculator

Estimate your body fat percentage with a tape measure, using the US Navy method.

Ovulation Calculator

Estimate when you ovulate and your most fertile days for the next three cycles.

Colour Contrast Checker

Check whether your text and background colours meet WCAG accessibility guidelines.

URL Parser

Break a URL into its parts and read every query parameter, decoded.

HTML Tag Remover

Strip HTML tags from text and keep the readable words.

Weighted Average Calculator

Find the weighted average of values that count for different amounts.

Permutation and Combination Calculator

Count the ways to arrange or choose items, with or without repetition.

Date Calculator

Add or subtract days, weeks, months or years from a date.

Time Card Calculator

Add up a week of working hours, breaks and overtime, and work out the pay.

Hourly to Salary Calculator

Convert between hourly, weekly, monthly and annual pay.

Fuel Cost Calculator

Work out the fuel and cost for a trip, and split it between passengers.

Sales Tax and VAT Calculator

Add tax to a price, or work out the tax already included in it.

Unit Price Calculator

Compare pack sizes and find which one is cheapest per gram, millilitre or item.

Paint Calculator

Work out how much paint you need for the walls and ceiling of a room.

Decimal to Fraction Calculator

Convert a decimal to a simplified fraction and a mixed number.

Dog Age Calculator

Find your dog’s age in human years, adjusted for its size.

Chmod Calculator

Work out Unix file permissions as a chmod number or in rwx form.

Subnet Calculator

Work out the network, broadcast address and host range for an IPv4 subnet.

Text to Binary Converter

Translate text into binary code, or paste binary to read it as text.

Discount Calculator

Calculate sale prices, discounts and savings.

Markup Calculator

Calculate markup percentage, cost and selling price.

Aspect Ratio Calculator

Calculate image or video dimensions while preserving aspect ratio.

Reading Time Calculator

Estimate how long it takes to read a piece of text.

Sentence Counter

Count sentences in text quickly.

Find & Replace

Find text and replace it throughout a block of text.

Line Break Remover

Turn multi-line text into a single line or clean paragraph text.

Random Picker

Pick one random item from a list.

Random Color Generator

Generate a random HEX colour instantly.

Day of Week Calculator

Find the weekday for any date.

Unix Timestamp Converter

Convert Unix timestamps to dates and dates to Unix timestamps.

HTML Entity Encoder

Encode or decode HTML entities in your browser.

Binary Converter

Convert decimal numbers to binary and binary back to decimal.

Hex Converter

Convert decimal numbers to hexadecimal and back.

CSV to JSON Converter

Convert simple CSV data to JSON in your browser.

JSON to CSV Converter

Convert a simple JSON array of objects to CSV.

JPG, PNG and WebP Converter

Convert JPG and PNG images locally in your browser.

Image Cropper

Crop an image to custom dimensions in your browser.

PRACTICAL GUIDES

Understand the tools.

Search-focused guides with formulas, examples and practical explanations related to the tools people use.

How to calculate percentages

Percent of a number, percentage increase and percentage decrease.

How word counting works

Words, characters, sentences and lines explained.

How to format JSON

Pretty-print, validate and minify JSON safely in your browser.

How to compress images

Learn how dimensions, formats and quality affect file size.

How to create strong passwords

Length, randomness and safer password habits.

How unit conversion works

Understand common conversion factors and temperature formulas.