Converters · 100% Free
Free Unit Converter Online
Switch between metric and imperial units in a heartbeat. Convert centimeters to inches, kilograms to pounds, Celsius to Fahrenheit and dozens more — free, instant and private.
How to Use the Unit Converter
1
Pick a category: Length, Weight or Temperature.
2
Type the value you want to convert.
3
Choose the ‘from’ and ‘to’ units from the dropdowns — or hit Swap to flip them.
4
Read the result instantly. It updates live as you type.
Why Use Our Unit Converter?
- Three categories. Length (mm to miles), weight (mg to tons) and temperature (°C, °F, K) in one tool.
- Live conversion. Results update with every keystroke — no submit button needed.
- Accurate factors. Standard international conversion constants, rounded sensibly.
- Private and free. Everything computes locally; no account, no cost.
Unit Converter FAQs
Exactly 2.54 centimeters make one inch. Type any value above — for example, 100 cm converts to about 39.37 inches instantly.
Select Weight, enter your kilograms, choose kg to lb. One kilogram equals about 2.20462 pounds.
Pick Temperature, enter your °C value and choose °C to °F. The formula is (°C × 9/5) + 32 — so 20°C is 68°F.
273.15 K. Kelvin starts at absolute zero, so you just add 273.15 to the Celsius value.
It uses exact standard factors (1 inch = 2.54 cm by definition) and shows up to 6 significant decimals — fine for everyday and most technical use.
Once the page has loaded, conversions run entirely in your browser with no network needed.
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