Convert between degrees Celsius, degrees Fahrenheit and kelvin. Temperature is the one common quantity where a conversion needs an offset as well as a factor.

Results are estimates. They do not replace the governing code, class or flag requirements, or a check by a competent person. Report a problem

Worked example

25 °C = 77 °F, because 25 × 9/5 + 32 = 77.

Reference points

Point	°C	°F	K
Absolute zero	-273.15	-459.67	0
Water freezes	0	32	273.15
ISO standard atmosphere	15	59	288.15
Room temperature	20	68	293.15
Water boils at 1 atm	100	212	373.15

FAQ

What is the formula from Celsius to Fahrenheit?
Multiply by 9/5 and add 32. The reverse is to subtract 32 and multiply by 5/9.

Does a temperature difference convert the same way?
No. An interval has no offset, so a rise of 10 K equals a rise of 10 °C and a rise of 18 °F. Use the factor alone.

Temperature unit converter

Worked example

Reference points

FAQ