°C to °F: formula °F = °C × 1.8 + 32

The formula

°F = °C × 1.8 + 32

Where the factor comes from — each unit by its definition, then its size in SI:

T(K) = (T(°C) + 273.15) × 1
T(K) = (T(°F) + 459.67) × 0.5555555556

Gas laws and radiation formulas need absolute temperature in kelvin. Celsius and kelvin differ by an offset only; Fahrenheit differs in both offset and step size, so it is a formula, not a single factor.

Worked examples

Water freezing: 0 °C = 32 °F — 0 × 1.8 + 32 = 32
Human body temperature: 37 °C = 98.6 °F — 37 × 1.8 + 32 = 98.6
A baking oven: 176.667 °C = 350 °F — 176.667 × 1.8 + 32 = 350
A warm room (293.15 K): 20 °C = 68 °F — 20 × 1.8 + 32 = 68

Frequently asked questions

How many degrees Fahrenheit is 1 °C?

1 °C = 33.8 °F. The rule is °F = °C × 1.8 + 32.

How do I convert degrees Fahrenheit back to degrees Celsius?

Invert the rule: °C = (°F − 32) / 1.8.

°C to °F conversion table

Degrees Celsius (°C)	Degrees Fahrenheit (°F)
-40	-40
-30	-22
-20	-4
-10	14
-5	23
0	32
5	41
10	50
15	59
20	68
25	77
30	86
35	95
37	98.6
40	104
50	122
60	140
70	158
80	176
90	194
100	212
150	302
200	392
250	482
300	572

Definitions: BIPM, The International System of Units (SI Brochure), 9th edition (2019), Tables 2, 4 and 8 — https://www.bipm.org/en/publications/si-brochure · NIST Special Publication 811 (2008), Guide for the Use of the International System of Units, Appendix B — https://www.nist.gov/pml/special-publication-811. Machine value of the factor: 1.8, offset 32.