Are US and Imperial units the same?
No. US and Imperial fluid ounces, pints, quarts, and gallons have different sizes, so they are listed as separate units.
Free online conversion tool
Unit Converter
Convert everyday, scientific, cooking, digital, and engineering units instantly. Enter a decimal, fraction, mixed number, or running pace and see every useful equivalent.
Distance
Length converter
Convert metric, Imperial, US customary, nautical, and astronomical lengths.
Conversion
1 metre = 3.280839895 feet
All length conversions
Choose any result to make it the destination unit.
Recent conversions
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Quick guide
How to convert units
The result updates as you type, and the complete equivalent table makes it easy to compare one value across an entire measurement category.
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01
Choose a measurement category
Select length, mass, temperature, data, cooking, fuel economy, engineering units, or another category. Search works with unit names and symbols.
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Enter a value and units
Type a decimal, scientific notation, simple fraction, or mixed number. Running pace also accepts entries such as
5:30. -
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Copy, compare, or share
Copy the main result, select another equivalent, adjust the displayed precision, or copy a link that recreates the conversion.
Accurate conversions
Useful units with the important distinctions preserved
The converter keeps similarly named units separate, uses reciprocal formulas where multiplication is not valid, and labels approximate or context-dependent results.
Why are MB and MiB different?
A megabyte is 1,000,000 bytes. A mebibyte is 1,048,576 bytes. Decimal SI and IEC binary prefixes are kept separate.
How is fuel economy converted?
Fuel consumption and fuel economy have a reciprocal relationship. Converting US mpg to L/100 km uses 235.214583 divided by mpg.
Can cooking volume become weight?
Not without knowing the ingredient density. This tool converts cooking volumes and masses separately rather than pretending every ingredient weighs the same.
How much precision should I use?
Automatic precision is useful for everyday work. Technical results should be rounded to match the accuracy and significant figures of the original measurement.
Does mass mean weight?
They are technically different quantities: mass measures matter and weight is a force. Everyday pound and kilogram conversions are grouped under a familiar label.
Included converters
22 unit categories in one tool
From common household measurements to engineering and digital units, every category is available without an account.
Length
Nanometres, millimetres, centimetres, metres, kilometres, inches, feet, yards, miles, nautical miles, and astronomical units.
Area
Square metric units, square inches, square feet, square yards, acres, hectares, and square miles.
Volume
Metric volume, cubic units, US liquid measures, and separately labelled Imperial measures.
Cooking
Millilitres, litres, teaspoons, tablespoons, US cups, metric cups, fluid ounces, pints, quarts, and gallons.
Mass and weight
Milligrams, grams, kilograms, tonnes, ounces, pounds, stone, short tons, and long tons.
Temperature
Degrees Celsius, degrees Fahrenheit, kelvin, and degrees Rankine with absolute-zero validation.
Time, speed, and pace
Time intervals, road and nautical speeds, metres per second, the speed of light, and running pace.
Pressure, energy, and power
Pascals, bar, psi, atmosphere, joules, calories, watt-hours, BTU, watts, kilowatts, and horsepower.
Digital units
Bits, bytes, decimal kilobytes through petabytes, binary kibibytes through pebibytes, and transfer rates.
Engineering units
Acceleration, flow rate, angles, frequency, force, torque, and density.
Fuel economy
Litres per 100 kilometres, kilometres per litre, miles per US gallon, and miles per Imperial gallon.
Flexible input
Decimal and scientific notation, simple fractions, mixed numbers, and minutes-and-seconds pace values.