Convert units
Choose a category, then convert from one unit to another.
How the conversions work
Length and weight conversions use fixed factors relative to a base unit. One inch is exactly 2.54 centimeters, one foot is 30.48 centimeters, one mile is 1609.344 meters, and one pound is exactly 453.59237 grams. Temperature uses formulas: Fahrenheit is Celsius times 9 divided by 5 plus 32, and Kelvin is Celsius plus 273.15. The converter changes the source value to a base unit, then to the target unit.
Frequently asked questions
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. So one foot is 30.48 centimeters and one mile is about 1609.34 meters.
How many grams are in a pound?
There are exactly 453.59237 grams in one pound. One ounce is one sixteenth of a pound, about 28.3495 grams, and one kilogram is about 2.20462 pounds.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9, divide by 5, and add 32. 100 degrees Celsius equals 212 degrees Fahrenheit.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius value. 0 degrees Celsius is 273.15 Kelvin and 25 degrees Celsius is 298.15 Kelvin.
Is my data saved anywhere?
No. All conversions run entirely in your browser. Nothing you enter is uploaded or saved on a server.
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Disclaimer: Results are provided for general informational purposes only. Always double-check important figures independently.