Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Celsius
Fahrenheit
Kelvin
About the Temperature Converter
This temperature converter converts between Celsius (°C), Fahrenheit (°F), and Kelvin (K) instantly. Enter a value in any unit and all three scales update simultaneously, so you can see the equivalent temperature in every unit at once.
Celsius is used in most countries and in science. Fahrenheit is used primarily in the United States. Kelvin is used in physics and chemistry where absolute temperature matters. Common reference points: water freezes at 0°C / 32°F, boils at 100°C / 212°F, and absolute zero is −273.15°C / −459.67°F / 0 K.
Frequently asked questions
How do I convert Fahrenheit to Celsius by hand?
Subtract 32, then multiply by 5/9. Going the other way: multiply by 9/5, then add 32. A quick approximation: subtract 30 and divide by 2 — close enough for casual use.
What's special about Kelvin?
Kelvin starts at absolute zero (the coldest temperature physically possible — about -273.15 °C). It's the SI unit used in physics and chemistry because temperature differences are linear: doubling Kelvin really does mean twice as hot.