Unit Converter
Convert length, weight and temperature units instantly.
🔒 100% browser-based — your data never leaves your device.
About this tool
Convert between the everyday units of length (millimeter, centimeter, meter, kilometer, inch, foot, yard, mile), weight (gram, kilogram, ton, ounce, pound) and temperature (Celsius, Fahrenheit, Kelvin). Type a value on either side and the other side updates immediately.
Conversion factors follow the international definitions (1 inch = 2.54 cm exactly, 1 pound = 453.59237 g exactly), so results are precise enough for schoolwork, cooking, shipping and shopping.
Frequently asked questions
How do I convert Fahrenheit to Celsius in my head?
Subtract 32 and multiply by 5/9. Quick estimate: subtract 30 and halve it. 68°F is exactly 20°C.
How many centimeters is one inch?
Exactly 2.54 cm, by international definition since 1959.
Is a US pound the same as a UK pound?
Yes, both use the international avoirdupois pound of exactly 453.59237 grams.