Work it out.
Free calculators, converters and generators. Type a number, get the answer, get on with your day.
Maths & percentagesView all ›
Percentages, fractions, ratios and averages. The sums everyday life keeps asking for.
Maths
Percentage calculator
Work out any percentage, three ways.
Maths
Percentage increase calculator
Add a percentage rise to any starting number.
Maths
Percentage change calculator
Increase or decrease between two values.
Maths
Percentage decrease calculator
Take a percentage off any starting number.
Maths
Percentage difference calculator
Symmetric difference between two values.
Maths
Fraction calculator
Add, subtract, multiply or divide fractions.
Maths
Fraction to decimal converter
Fractions to decimals and back, simplified.
Maths
Ratio calculator
Simplify ratios or find the missing value.
Maths
Mean, median & mode calculator
Mean, median, mode and more from any list.
Maths
Standard deviation calculator
Sample and population sd from your data.
Maths
Rounding & significant figures calculator
Round to decimal places or sig figs.
Maths
Roman numerals converter
Numbers to Roman numerals and back.
Money & UKView all ›
VAT, salaries, mortgages and savings. UK rates, current tax year, no jargon.
Money
VAT calculator
Add or remove 20% VAT from any amount.
Money
Compound interest calculator
Watch savings grow year by year.
Money
Take-home pay calculator
Your salary after tax and NI, 2026/27.
Money
Pro-rata salary calculator
Full-time salary scaled to your hours.
Money
Holiday entitlement calculator
Statutory annual leave for your pattern.
Money
National Insurance calculator
Employee NI on your salary, 2026/27.
Money
Hourly wage to salary converter
Hourly rate to annual salary and back.
Money
Stamp duty calculator
SDLT for your next move, band by band.
Money
Mortgage repayment calculator
Monthly payment, total interest, total cost.
Money
Mortgage overpayment calculator
Time and interest saved by paying extra.
Money
Loan repayment calculator
Monthly payments and true cost of a loan.
Money
Margin & markup calculator
Profit, margin and markup from two numbers.
Money
UCAS points calculator
A-level grades to UCAS tariff points.
Money
UK inflation calculator
What past money is worth today, via CPI.
Money
Tip calculator
Tip, total and each person's share.
Money
Fuel cost calculator
What any journey costs in fuel.
Money
Energy running cost calculator
Appliance running costs per day and year.
Money
Student loan repayment calculator
Monthly student loan repayments by plan.
Money
Redundancy pay calculator
Statutory redundancy pay, 2026 caps.
Money
Day rate to salary calculator
Day rate to annual salary and back.
Money
Net to gross salary calculator
The gross salary behind your take-home target.
Money
Overtime pay calculator
Pay at standard, time and a half and double.
Money
CAGR calculator
Annual growth rate from start and end.
Money
Currency converter
30 currencies at daily ECB reference rates.
Text & writingView all ›
Count it, clean it, convert it. Tools for anyone who works with words.
Text
Word counter
Words, characters and reading time, live.
Text
Character counter
Live character counts and limit checks.
Text
Case converter
Switch text between four cases in a click.
Text
Reading time calculator
How long your text takes to read or speak.
Text
Remove line breaks
Turn broken lines back into flowing text.
Text
Remove extra spaces
Collapse repeated spaces and tidy lines.
Text
Duplicate line remover
Delete repeated lines, keep the order.
Text
Alphabetical order sorter
Sort any list A to Z or Z to A.
Text
Lorem ipsum generator
Classic placeholder text in one click.
Text
Small text generator
Tiny superscript, small caps and wide text.
Text
Reverse text generator
Flip characters, word order or letters.
Text
Word frequency counter
Your most used words, counted live.
Text
Morse code translator
Text to Morse and back, live.
Text
Online notepad
Jot notes that autosave in your browser.
Text
Find and replace
Search and replace with regex and live counts.
Text
Text splitter
Split text into chunks or at a delimiter.
Text
Emoji remover
Strip every emoji and see how many went.
Text
Upside down text
Flip your text upside down to paste anywhere.
Text
Special characters to copy
One-tap copy for symbols and accents.
Colour & designView all ›
Convert, pick and test colours. Made for designers, decorators and the colour-curious.
Colour
Hex to RGB converter
Hex codes to RGB and HSL, with preview.
Colour
RGB to hex converter
RGB values to a hex code, with preview.
Colour
Colour picker
Pick a colour, get hex, RGB and HSL.
Colour
Image colour picker
Click any pixel in a photo to get its colour.
Colour
Colour palette generator
Five-swatch palettes from one base colour.
Colour
Random colour generator
Truly random colours with hex and RGB.
Colour
Contrast checker
WCAG contrast ratios with pass badges.
Colour
CSS gradient generator
Two colours to ready-made gradient CSS.
Colour
HSL converter
Hex to HSL, or HSL sliders to hex.
Colour
CMYK to RGB converter
CMYK values to RGB and hex, both ways.
Colour
Shades & tints generator
Five tints and five shades from any colour.
Colour
Colour name finder
Nearest CSS colour name for any hex code.
Colour
Colour palette from image
Get 6 dominant colours from any photo.
Date & timeView all ›
Ages, deadlines, countdowns and timesheets. Every calendar question, answered.
Dates
Age calculator
Exact age, and days to the next birthday.
Dates
Days between dates calculator
Count the days between any two dates.
Dates
Date calculator
Add or subtract time from any date.
Dates
Working days calculator
Count working days between two dates.
Dates
What week number is it?
Find the ISO week number for any date.
Dates
Day of the week finder
Find the weekday for any date.
Dates
Countdown to a date
Live countdown to any date and time.
Dates
Hours calculator
Hours between two times, minus breaks.
Dates
Time calculator
Add or subtract hours and minutes.
Dates
Pregnancy due date calculator
Due date from your last period, plus weeks.
Dates
Sleep cycle calculator
Bedtimes and wake times in 90-minute cycles.
Dates
Star sign calculator
Find the zodiac sign for any birthday.
Dates
Minutes to hours converter
Minutes to h:mm and decimal hours.
Dates
Time zone converter
Convert times between world zones.
Dates
Pomodoro timer
25/5/15 focus timer with session dots.
Dates
Stopwatch
Laps with split and total, to the hundredth.
Dates
Days until Christmas
Live sleeps countdown to 25 December.
Dates
Moon phase calculator
Moon phase and illumination for any date.
Dates
Leap year checker
Yes or no, with the 4/100/400 rule shown.
Dates
Dog age calculator
Dog years to human years, by size.
Dates
Cat age calculator
Cat years to human years, the 15/24/+4 chart.
Random & generatorsView all ›
Passwords, picks, rolls and flips. When you need chance on your side.
Random
Random number generator
Fair picks between any two numbers.
Random
Password generator
Strong random passwords, made locally.
Random
Dice roller
Roll d4 to d20, totals included.
Random
Coin flip
Heads or tails with a running tally.
Random
Wheel spinner
Spin a wheel of names to pick a winner.
Random
Random team generator
Split any list of names into fair teams.
Random
Random letter generator
Random letters, vowels or consonants.
Random
Random word generator
Random words for games and prompts.
Random
Username generator
Fresh username ideas, click to copy.
Random
Passphrase generator
Memorable random word passphrases.
Random
QR code generator
Turn any link or text into a QR code.
Random
Yes or no
Let chance decide, yes or no.
Random
Secret Santa generator
Draw names so nobody gets themselves.
Random
Bulk QR code generator
Up to 1,000 QR codes in one ZIP.
Random
Magic 8 ball
Shake the ball and get one of 20 answers.
Random
Spin the bottle
Spin a bottle to pick a player at random.
Random
Scratch card
Scratch the foil to reveal a random outcome.
Random
Slot machine name picker
Spin a reel of names to pick a winner.
Random
Fortune cookie
Crack a cookie for an original fortune.
Random
Bingo card generator
Generate and print UK 90-ball bingo cards.
Random
Combination generator
Every way of choosing r items from n.
Random
Random coordinates generator
Fair random points across the globe.
Random
Lottery number generator
Random lines for UK lottery games.
Random
EuroMillions number generator
Random EuroMillions lines, drawn fairly.
Converters & unitsView all ›
Kilograms to stones, cups to grams, miles to kilometres. Both ways, instantly.
Convert
Kg to stone converter
Kilograms to stones and pounds, both ways.
Convert
Cm to feet converter
Centimetres to feet and inches, both ways.
Convert
Length converter
mm, cm, m, km, inches, feet, yards, miles.
Convert
Weight converter
Grams, kg, ounces, pounds and stones.
Convert
Temperature converter
Celsius and Fahrenheit, both ways, live.
Convert
Miles to km converter
Miles and kilometres, both ways, live.
Convert
Litres to pints converter
Litres to UK pints, both ways.
Convert
Cups to grams converter
US cups to grams for common ingredients.
Convert
Oven temperature converter
Celsius, fan, Fahrenheit and gas mark.
Convert
MPG converter
UK mpg to litres per 100 km, both ways.
Convert
Shoe size converter
UK shoe sizes to EU and US, men and women.
Convert
Data size converter
KB, MB, GB and TB, decimal or binary.
Convert
Number to words converter
Figures written out in British English words.
Convert
BMI calculator
Body mass index with the NHS categories.
Convert
Speed converter
mph, km/h, m/s, knots and Mach.
Convert
Area converter
sq m, sq ft, acres, hectares, sq miles.
Convert
Volume converter
ml, litres, pints, gallons, UK and US.
Convert
Calories to kJ converter
kcal to kJ and back, exact factor 4.184.
Convert
Pressure converter
Bar, psi, kPa and atm for tyres and more.
Convert
Power converter
Watts, kW, horsepower and PS, both ways.
Convert
Ring size converter
UK letters to US numbers and mm, both ways.
Convert
Military time converter
24-hour to 12-hour am/pm and back.
Convert
Alcohol unit calculator
UK units from ABV and volume.
Dev & dataView all ›
Format, encode, hash and compare. Small sharp tools for people who ship.
Dev
JSON formatter
Pretty print, minify and validate JSON.
Dev
Base64 encode & decode
Encode and decode Base64, UTF-8 safe.
Dev
URL encode & decode
Percent-encode and decode URLs and text.
Dev
HTML escape & unescape
Escape and unescape HTML entities.
Dev
Slug generator
Titles into clean hyphenated URL slugs.
Dev
UUID generator
Random v4 UUIDs, up to 100 at a time.
Dev
Hash generator
SHA-256, SHA-1 and SHA-512 hex digests.
Dev
Unix timestamp converter
Epoch timestamps to dates and back.
Dev
CSV to JSON converter
Turn CSV rows into a clean JSON array.
Dev
Regex tester
Test regex patterns with live matches.
Dev
Diff checker
Compare two texts, see added and removed lines.
Dev
Markdown previewer
Preview markdown as you type.
Dev
Number base converter
Binary, octal, decimal, hex and text.
Dev
JWT decoder
Decode JWT header, payload and expiry.
Dev
XML formatter
Pretty print, minify and check XML.
Dev
CSS minifier
Strip CSS whitespace, see bytes saved.
Dev
Cron expression translator
Cron schedules explained in English.
Dev
URL parser
Split a URL into its decoded parts.
Dev
SQL formatter
Tidy SQL with clauses on their own lines.
Dev
Inline CSS converter
Turn style blocks into inline styles for email.
Dev
Email link generator
Build correctly encoded mailto email links.
Dev
UTM link generator
Build tagged campaign URLs for GA4.
Dev
Dummy data generator
Fake but safe test records, CSV or JSON.
Dev
Meta tag generator
Build title, OG and Twitter meta tags.
Dev
Schema markup generator
Build JSON-LD structured data blocks.
Dev
Robots.txt generator
Build and download a robots.txt file.
CryptoView all ›
Converters, calculators and validators for Bitcoin, Ethereum and beyond. No prices, no wallets, no nonsense.
Crypto
Satoshi to BTC converter
Sats, BTC, mBTC and bits, both ways.
Crypto
ETH unit converter
Wei, gwei and ETH without rounding errors.
Crypto
Crypto profit calculator
Profit, fees and breakeven for any coin.
Crypto
Crypto DCA calculator
Average cost across all your buys.
Crypto
Position size calculator
Units to buy for the risk you choose.
Crypto
Staking rewards calculator
Final balance and true APY from staking.
Crypto
Market cap calculator
Price times supply, and the reverse.
Crypto
Bitcoin address validator
Check BTC addresses: legacy, SegWit, Taproot.
Crypto
Ethereum address checksum
Validate and checksum ETH addresses.
Files & dataView all ›
Convert images, spreadsheets and data files without uploading them. Everything happens on your device.
Files
WebP to JPG converter
WebP to JPG with a quality slider.
Files
PNG to JPG converter
PNG to JPG, white background, sizes compared.
Files
JPG to PNG converter
JPG to lossless PNG in one click.
Files
Image resizer
Resize images to exact pixels, locally.
Files
Image compressor
Shrink photo file sizes with a slider.
Files
Image to Base64 converter
Images to data URIs with copy-ready snippets.
Files
SVG to PNG converter
SVG files to sharp PNGs at 1x, 2x, 4x.
Files
EXIF remover
Strip GPS and metadata from photos.
Files
JPG to PDF converter
Images become PDF pages, in your browser.
Files
Excel to JSON converter
Turn Excel sheets into clean JSON.
Files
Excel to CSV converter
Turn Excel sheets into clean CSV files.
Files
Excel to XML converter
Turn Excel sheets into structured XML.
Files
JSON to Excel converter
Turn a JSON array into a .xlsx file.
Files
CSV to Excel converter
CSV to .xlsx without mangled zeros or dates.
Files
XML to Excel converter
Turn repeated XML records into .xlsx rows.
Files
Favicon generator
Make a real .ico favicon from any image.
Files
File hash checker
Check a file's SHA-256 checksum locally.
Files
Rotate & flip image
Rotate or flip a photo in your browser.
Files
Signature generator
Draw and download a transparent signature.
Files
Add to calendar file generator
Make a .ics calendar file for any event.
Files
Dummy file generator
Test files of an exact size, locally.
Files
Dummy image generator
Placeholder images at any size, locally.
Files
HEIC to JPG converter
iPhone HEIC photos to JPG, in your browser.
Files
Merge PDF files
Combine PDFs into one, in your browser.
Files
Split PDF
Extract pages or split a PDF to a ZIP.