OneTaskUnit Converters
Metric to Imperial, Inches to cm, kg to lbs and GB to MB
One pair of units per page, each showing the exact factor, a worked example and a reference table you can scan. Type in either box and the other updates, so every page converts both ways: centimetres to inches or inches to centimetres, kilograms to pounds or pounds to kilograms.
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Every Units tool
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.
Cubic Metres To Cubic Feet
Convert cubic metres to cubic feet with the exact factor.
UpdatedCups 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.
NewDegrees To Radians
Convert degrees to radians: multiply by π/180.
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.
GB To GiB
Convert decimal gigabytes to binary gibibytes: multiply by 0.9313.
UpdatedGB 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.
Hectares To Acres
Convert hectares to acres with the exact factor.
UpdatedInches To Feet
Convert inches to feet: divide by 12.
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.
KJ To Calories
Convert kilojoules on a food label to calories: divide by 4.184.
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.
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.
UpdatedKm/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.
ML To Fl Oz
Convert millilitres to US fluid ounces with the exact factor.
Mbps To MB/s
Convert Mbps to MB/s: divide by 8.
Metres To Feet
Convert metres to feet with the exact factor.
Metres To Yards
Convert metres to yards with the exact factor.
Oven Temperature Converter
Celsius, fan, Fahrenheit and gas mark oven temperatures, any direction.
Pixels To Inches
Pixels to inches or cm and back, at the DPI you choose.
UpdatedPounds To Stone
Convert pounds to stone: divide by 14.
Print Size Calculator
Pixel dimensions to print size at 300 DPI and every quality level.
RGB To CMYK
Convert hex or RGB colours to CMYK percentages and back.
Scientific Notation Converter
Convert numbers to scientific, E and engineering notation and back.
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.
TB To PB
Convert terabytes to petabytes: divide by 1,000, or 1,024 for binary.
UpdatedTablespoons To Grams
Tablespoons and teaspoons to grams, any ingredient, any spoon standard.
Tablespoons To Ml
Convert US tablespoons to millilitres: multiply by 14.79.
Teaspoons To Ml
Convert US teaspoons to millilitres: multiply by 4.93.
Tonnes To Pounds
Convert metric tonnes to pounds with the exact factor.
Exact factors, not rounded ones
Most imperial units are defined in terms of metric ones. The inch is exactly 25.4 millimetres, the pound exactly 0.45359237 kilograms and the US gallon exactly 3.785411784 litres, so these converters use those definitions rather than a rounded approximation. Results are shown to a sensible number of places, and the full factor is on the page if you need more.
Temperature is not a multiplication
Celsius, Fahrenheit and Kelvin have different zero points, so converting between them needs an offset as well as a scale. The temperature pages show the formula and walk through an example, which is also why doubling a temperature in Celsius does not double it in Fahrenheit.
Data sizes: decimal and binary
A gigabyte is 1,000 megabytes in the decimal system drive makers use, but operating systems often count in binary gibibytes of 1,024 mebibytes. The data pages show both, which explains why a new 1 TB drive reports around 931 GB when you plug it in.
Speed, energy and area
Speed pages cover km/h, mph, knots and metres per second. Energy pages convert joules, kilojoules, calories and kilowatt-hours, the units on food labels and power bills. Area covers square metres, square feet, hectares and acres for property and land.
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