Unit converter
Length, weight, temperature, volume, data and much more
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What is Unit converter?
This converter turns a measurement from one unit into another: kilometers to miles, kilos to pounds, degrees Celsius to Fahrenheit, liters to gallons, gigabytes to gibibytes and many more.
Besides the conversion you choose, it shows the value in every unit of the same quantity, so you can see all the equivalents at a glance.
How to use it
- Choose the quantity: length, mass, temperature, volume, area, speed, time, data, pressure or energy.
- Enter the value you want to convert.
- Select the source and target units.
- Click the swap button to reverse the conversion.
- Click any equivalent in the list to copy it.
Advantages
- 10 quantities and more than 90 metric, imperial and US customary units.
- Table with the value in every unit at once.
- Distinguishes decimal units (KB, MB, GB) from binary units (KiB, MiB, GiB).
- Free, no sign-up and no ads.
Technical details
Each unit is defined by its factor relative to the base unit of its quantity, and the conversion is value × source factor / target factor, rounded to 12 significant figures to avoid floating-point errors. Temperature isn't proportional and is converted via kelvin (K = °C + 273.15; °F = °C × 9/5 + 32). Exact definitions are used: 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 US gallon = 3.785411784 L. For data, 1 KB = 1000 bytes (SI) and 1 KiB = 1024 bytes (IEC 80000-13). The month is an average and the year is 365.25 days. Mach is taken at sea level. It also includes US and UK pints and gallons, cups and tablespoons, carats, stone, knots, psi, mmHg, kWh, BTU and electronvolts.
Frequently asked questions
How many miles is a kilometer?
One kilometer is about 0.621371 miles, and one mile is 1.609344 km.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C is 68 °F. The other way round: (°F − 32) × 5/9.
Why does a 1 TB drive show less space?
The manufacturer uses 1 TB = 10^12 bytes and many systems count in binary units: 1 TB is about 0.909 TiB, which the system shows as “931 GB”.
How many kilos is a pound?
One pound is exactly 0.45359237 kg, about 454 grams. One kilo is about 2.2046 pounds.
How many bar is 30 psi?
30 psi is about 2.07 bar. One bar is about 14.5 psi, which is handy for tire pressure.
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