Fahrenheit to Celsius

Convert Fahrenheit to Celsius, with the math shown step by step.

40 °F = 4.44 °C

Also equals

How it works

°C = (°F − 32) ÷ 1.8

Water freezes at 32 °F, which is 0 °C, so first take away 32. Then divide by 1.8, because a Celsius degree is 1.8 times as big as a Fahrenheit degree. A quick check: an oven at 350 °F is about 177 °C.

Subtract 32 40 − 32 = 8
Divide by 1.8 (that is 9/5) 8 ÷ 1.8 = 4.44 °C

Nearby values

Degrees Fahrenheit	Degrees Celsius	Kelvins
37 °F	2.78 °C	275.93
38 °F	3.33 °C	276.48
39 °F	3.89 °C	277.04
40 °F	4.44 °C	277.59
41 °F	5 °C	278.15
42 °F	5.56 °C	278.71
43 °F	6.11 °C	279.26

Printed from rocketcalc.io/temperature/fahrenheit-to-celsius/40