Convert a temperature between Celsius, Fahrenheit and Kelvin. Type a value, choose its unit, and see all three at once.
Celsius
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| Fahrenheit | – |
| Kelvin | – |
How it works
Fahrenheit = Celsius × 9 ÷ 5 + 32. Celsius = (Fahrenheit − 32) × 5 ÷ 9. Kelvin = Celsius + 273.15. Absolute zero is 0 K, or −273.15 °C.
Example
20 °C is 68 °F and 293.15 K. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level.
Frequently asked questions
How do I convert Celsius to Fahrenheit quickly?
Double the Celsius number, subtract 10 percent, and add 32. It is close enough for everyday use.
What is 0 Kelvin?
Absolute zero, the lowest possible temperature.
Why do some countries use Fahrenheit?
It is a historical scale still used in everyday life in the United States and a few other places.
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Conversions are rounded to two decimals.