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Unit Converters

Kilometres to Miles, Cups to Grams, Km/h to Mph and PX to REM

Converters for the units that trip people up. Metric and imperial lengths and weights, cups and grams, Fahrenheit and Celsius, knots and kilometres per hour, joules and calories, and pixels and rems for the web. Every converter works both ways and shows the formula it uses.

84 tools tagged Unit Conversion

Baker's Percentage

Baker's percentages, dough hydration and true sourdough hydration from gram weights.

Base Converter

Convert numbers between binary, octal, decimal and hex.

Bed Size Calculator

Mattress dimensions by country in cm and inches, and nearest sizes.

Belt Size Calculator

Find your belt size from your trouser waist or an old belt.

BMI Calculator Kg Cm

Metric BMI from kilograms and centimetres, formula included.

Board Foot Calculator

Board feet, cubic volume and cost of timber or lumber.

Bra Size Calculator

Find your bra size in UK, US, EU, FR and AU sizing.

Bytes To KB

Convert bytes to kilobytes: divide by 1,000, or 1,024 for binary.

Celsius To Fahrenheit

Convert Celsius to Fahrenheit with the exact formula.

Cm To Inches

Convert centimetres to inches with the exact factor.

Coffee Ratio

Grams of coffee for any amount of water by brew method.

Cooking Time Calculator

Convert recipe times and temperatures between oven, fan oven and air fryer.

Coordinate Converter

Convert lat/lng between decimal, DMS and UTM on a map.

CSS Colour Converter

Convert CSS colours between hex, rgb, hsl, hwb, lab, lch and oklch.

Cubic Metres To Cubic Feet

Convert cubic metres to cubic feet with the exact factor.

Cups To Grams

Cups to grams for any ingredient, in US, metric or imperial cups.

Cups To Ml

Convert US cups to millilitres: multiply by 236.59.

Cycling Speed Calculator

Average speed from a ride, or road speed from cadence and gearing.

Data Usage Calculator

Estimate data used per hour, day and month for streaming, calls and browsing.

Decimal Hours Converter

Convert 7:45 to 7.75 hours and back again.

Degrees To Radians

Convert degrees to radians: multiply by π/180.

Distance Calculator

Distance, speed or time from the other two, in any units.

Download Time Calculator

Find how long a file takes to download at your connection speed.

Epoch Converter

Convert Unix timestamps to dates and back again.

Feet To Cm

Convert feet to centimetres: multiply by 30.48.

File Size Converter

Convert any file or drive size into every decimal and binary unit at once.

Frequency To Wavelength Calculator

Convert frequency and wavelength for radio, light and sound.

Furniture Dimensions Calculator

Standard furniture sizes and whether a piece fits your space.

Garden Area Calculator

Garden or lawn area for any shape in m², ft² and acres.

GB To GiB

Convert decimal gigabytes to binary gibibytes: multiply by 0.9313.

GB To MB

Convert gigabytes to megabytes: multiply by 1,000, or 1,024 for binary.

GB To TB

Convert gigabytes to terabytes: divide by 1,000, or 1,024 for binary.

Grams To Ounces

Convert grams to ounces with the exact factor.

Hat Size Calculator

Convert head circumference to US, UK, EU and letter hat sizes.

Hectares To Acres

Convert hectares to acres with the exact factor.

Hours To Minutes Converter

Convert between seconds, minutes, hours, days and weeks.

Inches To Feet

Convert inches to feet: divide by 12.

Jeans Size Converter

Turn waist and inseam measurements into W/L jeans sizes and conversions.

Joules To Calories

Convert joules to calories: divide by 4.184.

Joules To KWh

Convert joules to kilowatt-hours: divide by 3.6 million.

KB To MB

Convert kilobytes to megabytes: divide by 1,000, or 1,024 for binary.

Kelvin To Celsius

Convert kelvin to Celsius by subtracting 273.15.

Kelvin To Fahrenheit

Convert kelvin to Fahrenheit with the exact formula.

Kg To Lbs

Convert kilograms to pounds with the exact factor.

Kg To Stone

Convert kilograms to stone and pounds.

KJ To Calories

Convert kilojoules on a food label to calories: divide by 4.184.

Km To Miles

Convert kilometres to miles with the exact factor.

Km/h To Knots

Convert kilometres per hour to knots with the exact factor.

Km/h To Mph

Convert kilometres per hour to miles per hour with the exact factor.

Knots To Mph

Convert knots to miles per hour with the exact factor.

Length Converter

Convert between metric and imperial lengths.

Litres To Gallons

Convert litres to US gallons with the exact factor.

M/s To Km/h

Convert metres per second to kilometres per hour: multiply by 3.6.

Mach Number Calculator

Convert speed to Mach and back using the speed of sound at your altitude.

Mbps To MB/s

Convert Mbps to MB/s: divide by 8.

Meat Cooking Calculator

Roast times by weight, core temperatures and resting for every common joint.

Metres To Feet

Convert metres to feet with the exact factor.

Metres To Yards

Convert metres to yards with the exact factor.

ML To Fl Oz

Convert millilitres to US fluid ounces with the exact factor.

Modern CSS Units Converter

Convert ch, cap, lh, dvh, cqi and other modern CSS units to px.

Oven Temperature Converter

Celsius, fan, Fahrenheit and gas mark oven temperatures, any direction.

Paper Sizes

A-series, Letter and Legal sizes in mm, inches and pixels at any DPI.

Pasta And Rice Portion Calculator

How much pasta, rice or grain to cook per person, with water and timing.

Pipe Volume Calculator

Water held in a pipe in litres and gallons, and its weight.

Pixels To Inches

Pixels to inches or cm and back, at the DPI you choose.

Pizza Dough Calculator

Flour, water, salt and yeast for any number of pizzas and any rise.

Pounds To Stone

Convert pounds to stone: divide by 14.

Print Bleed Calculator

Work out document size with bleed, the safe area and pixel dimensions.

Print Size Calculator

Pixel dimensions to print size at 300 DPI and every quality level.

PX To REM Converter

Batch convert pixels to rem and back.

Recipe Scaler

Scale a whole ingredient list to a new number of servings.

Running Pace Calculator

Pace per km and mile, finish times and race predictions at the same pace.

Screw And Bolt Size Chart

Pilot, tap drill, clearance hole and spanner size by screw or bolt.

Square Km To Square Miles

Convert square kilometres to square miles with the exact factor.

Square Metres To Square Feet

Convert square metres to square feet with the exact factor.

Steps To Distance Calculator

Steps to km or miles and back, from your height or measured stride.

Tablespoons To Grams

Tablespoons and teaspoons to grams, any ingredient, any spoon standard.

Tablespoons To Ml

Convert US tablespoons to millilitres: multiply by 14.79.

Tailwind Colour Converter

Convert hex codes to the nearest Tailwind class, or Tailwind classes to hex.

TB To PB

Convert terabytes to petabytes: divide by 1,000, or 1,024 for binary.

Teaspoons To Ml

Convert US teaspoons to millilitres: multiply by 4.93.

Tonnes To Pounds

Convert metric tonnes to pounds with the exact factor.

Viewport Unit Converter

Convert px to vw, vh, vmin, vmax and rem for any viewport size.

Water Tank Capacity Calculator

Tank capacity and water at a given depth, in litres and gallons.