Free Online Unit Converter
Pick the category, the source and target unit, and enter the value to convert.
Meters, miles, kilos, pounds, liters, gallons, Celsius, Fahrenheit — the conversions that come up most often day to day, using the official conversion factors, no formula to memorize.
Result
0,1
Centimeters (cm)
Mathematical conversions using exact, official factors. For technical or scientific use requiring more decimal places than shown, confirm the factor that applies to your specific standard.
Frequently asked questions
Are the conversion factors exact or approximate?
Exact. Length and mass use the factors from the 1959 international treaty that defines the inch and the pound relative to the metric system — the same ones used in technical and scientific standards.
Why does temperature work differently from the other categories?
Length, mass and volume are linear conversions (multiply by a fixed factor). Temperature has an offset on the scale in addition to the factor — that's why Celsius, Fahrenheit and Kelvin use their own formulas instead of a single factor.
Which volume unit do you use for 'gallon'?
The US gallon (3.785 liters), the most common reference for recipes, fuel and products imported from the US. The British imperial gallon is a different measurement.
Can I convert to more than one unit at once?
The tool shows one conversion at a time (source → target), but the result updates instantly whenever you change either side.