Formula
F = C x 9 / 5 + 32. C = (F - 32) x 5 / 9.
Temperature guide
Celsius vs Fahrenheit
Celsius is centered around water freezing at 0 and boiling at 100. Fahrenheit places those points at 32 and 212, so the conversion needs both multiplication and an offset.
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Examples
0 C = 32 F. 20 C = 68 F. 37 C = 98.6 F. 100 C = 212 F.
Where they are used
Celsius is common globally and in science. Fahrenheit is common for weather, cooking, and daily temperature in the United States.