Unit Converter
Convert length, area, volume, weight, speed, time, data, pressure, energy, power, fuel economy, angle and more — with every unit side by side.
About Unit Converter
This unit converter online converts between units in more than a dozen categories, including length, area, volume, weight, speed, time, digital data, pressure, energy, power, fuel economy and angle. Pick a category, type a value and choose the units, and the table below shows the value in every unit of that category at once.
It covers everyday conversions such as mm to feet, metres to feet, km to miles and kg to lb, as well as technical ones like MB to MiB. It is useful for students, engineers, travellers and anyone shopping online. The converter is free, needs no sign-up and works in your browser.
How to use Unit Converter
- Pick a category such as Length or Weight.
- Type a value and choose the unit you have.
- Choose the unit you want, or use the swap button.
- See the value in every unit of that category in the table below — tap a row to make it the target.
Frequently asked questions
How accurate are the conversion factors?
Factors use exact international definitions where they exist (for example 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 US gallon = 3.785411784 L). Results are shown to 10 significant digits.
What is the difference between MB and MiB?
MB (megabyte) is decimal: 1,000,000 bytes. MiB (mebibyte) is binary: 1,048,576 bytes. Drive makers use decimal units while many operating systems report binary units, which is why a “1 TB” drive shows about 931 GiB.
Why is Mbps different from MB/s?
Internet speeds are quoted in megabits per second. There are 8 bits in a byte, so a 100 Mbps connection downloads at most 12.5 MB/s.
How is fuel economy converted?
km/L and mpg are distance per fuel, while L/100 km is fuel per distance, so it is inverted: L/100 km = 100 ÷ km/L.
How many feet are in a metre?
One metre is about 3.281 feet. Choose Length and type 1 in metres to see it in feet, inches and every other unit.
How do I convert km to miles?
Multiply kilometres by 0.6214. For example, 10 km is about 6.21 miles.
How do I convert kg to pounds?
Multiply kilograms by 2.2046; 70 kg is about 154.3 lb.
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