Temperature Converter (°C, °F, K)

Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine.

How do I convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit, multiply by 9/5 and add 32: 25 °C = 77 °F. To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9. Kelvin is Celsius plus 273.15.

Reference points

°C	°F	K	Meaning
−273.15	−459.67	0	Absolute zero
0	32	273.15	Water freezes
37	98.6	310.15	Body temperature
100	212	373.15	Water boils (sea level)

−40 is the same in Celsius and Fahrenheit. Temperatures below absolute zero are rejected because they cannot exist.

Frequently asked questions

What is 180 °C in Fahrenheit?

356 °F — a common oven temperature.

Why is Kelvin written without a degree sign?

Kelvin is an absolute scale, so values are written as "K", not "°K".

What is Rankine?

An absolute scale using Fahrenheit-sized degrees, used in some US engineering.