Units · temperatureTemperature units
Convert temperature between Celsius, Fahrenheit, Kelvin and the historical scales. Type a value into any field — the rest update at once.
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Temperature conversion
type a value into any scale — the others follow02
Reference points
tap a row — the value goes into the converterOven temperature in Fahrenheit
how US oven dials round it03
About temperature scales
Temperature is measured on several scales, and converting them is trickier than metres into kilometres: Celsius and Fahrenheit have different zero points, so a conversion is not only a factor but also a shift. Kelvin and Rankine count from absolute zero — the lowest temperature there is.
Celsius
Everyday & science0 °C · 100 °C
Zero is tied to the freezing point of water and one hundred to its boiling point at sea level. The main scale in most countries and in everyday life.
Fahrenheit
USA32 °F · 212 °F
Used in the United States. Water freezes at 32 °F and boils at 212 °F, with 180 degrees in between.
Kelvin
SI · absolute0 K = −273.15 °C
The absolute SI scale: it counts from absolute zero and its step equals a degree Celsius. Written without a degree sign and never negative.
Why not just multiply
OffsetF = C × 9/5 + 32
Celsius and Fahrenheit have different zeros, so conversion is a scale plus a shift. Only Kelvin differs from Celsius by a shift alone (+273.15).
Absolute zero
Limit−273.15 °C
The lowest possible temperature, where thermal motion of particles is minimal. Nothing is colder; this is where Kelvin and Rankine start.
Rankine, Réaumur and others
Historical°Ra · °Ré
Rankine is “absolute Fahrenheit”, still seen in US engineering. Réaumur (0–80) turns up in old recipes and literature. Delisle and Newton are historical curiosities.
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