Temperature converter: Celsius, Fahrenheit, Kelvin and Rankine
Type a value in any box and the other three update. Negative numbers and decimals work.
Common reference points
How the numbers are worked out
Kelvin equals Celsius plus 273.15, which follows from the SI definition of the kelvin and the Celsius scale. Fahrenheit equals Celsius multiplied by 9/5, plus 32. Rankine equals Kelvin multiplied by 9/5, so 0 °R and 0 K are both absolute zero. Results are shown to six significant digits. Values below absolute zero (−273.15 °C) are flagged because no physical temperature is lower. The reference points assume standard atmospheric pressure where pressure matters, and body temperature is the conventional figure of 37 °C, which varies between people.