Unit Converter
Convert length, weight, temperature and 110+ units instantly. Free
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About the Unit Converter
Whisser Unit Converter changes a value from one unit to another instantly, whether you need kilometers in miles, kilograms in pounds, Celsius in Fahrenheit or gigabytes in megabytes. It covers 12 categories and more than 110 units using exact international conversion factors, and it runs entirely in your browser, so it is fast, private and works without an account.
How to use
- Pick a category, or type a search such as 10 km to miles or c to f and press Enter.
- Enter a value in the From field and choose the units on both sides. You can also type in the To field to convert backwards.
- Use the swap button to flip the units, and change the significant digits if you need more or less precision.
- Check All conversions to see your value in every unit, or the conversion table for common amounts, then copy the result.
Frequently asked questions
Which units can I convert?
You can convert length, weight, temperature, volume, area, speed, time, digital storage, pressure, energy, fuel economy and angle, with more than 110 units in total, from millimeters and ounces to light-years and kilowatt-hours.
How do I convert km to miles quickly?
Type a query such as 10 km to miles or c to f into the search box and press Enter. The converter jumps to the right category, selects both units and fills in the value.
What is the difference between GB and GiB?
A gigabyte (GB) is a decimal unit of 1,000,000,000 bytes, used by drive makers. A gibibyte (GiB) is a binary unit of 1,073,741,824 bytes, which many operating systems report. 1 GiB is about 1.074 GB.
How are L/100 km and mpg converted?
Liters per 100 km measures fuel used over a distance, while miles per gallon measures distance per unit of fuel, so the two are inversely related. The converter handles this automatically; for example, 25 mpg (US) is about 9.41 L/100 km.
How precise are the results?
Results use exact conversion factors from international definitions, such as 1 inch = 2.54 cm, and are shown with 8 significant digits by default. You can switch to 4 or 12 digits, and very large or very small values are shown in scientific notation.
Is the unit converter free?
Yes. It is free, needs no account, and remembers your last category and units on this device only.