Temperature Converter

Convert between Fahrenheit, Celsius, and Kelvin temperature scales instantly.

Unlike almost every other converter, this one cannot work by multiplying a single factor, because two of its three scales have their zero in a different place. Celsius comes from Fahrenheit by subtracting 32 and multiplying by five ninths; Kelvin is then Celsius plus 273.15, an offset with no multiplication at all since a kelvin and a degree Celsius are the same size. Pick any of the three as your entry and the other two are rebuilt from it, each rounded to two decimals. Two consequences follow. Water freezes at 32 on the Fahrenheit dial and zero on the Celsius one, so the Celsius reading flips negative exactly as you cross 32 °F. And because the entry field accepts anything down to -1000, nothing stops you asking for a temperature colder than absolute zero: the Kelvin figure simply goes negative once you pass -459.67 °F, which is a physical impossibility the page will not warn you about. What it does not do is convert temperature intervals. A rise of one degree Celsius is a rise of 1.8 Fahrenheit degrees, but feeding 1 into this page applies the 32-degree offset and returns 33.8, which is the wrong answer for a difference. Rankine, Réaumur and Delisle are absent, and no pressure is modelled, so the freezing and boiling landmarks assume sea level.