Freezing point of water
Input: 32 F
Output: 0 C
(32 - 32) x 5/9 = 0.
Fahrenheit to Celsius converter
Switch Fahrenheit readings to Celsius with one direct calculation.
Celsius:
Formula and algorithm
- Celsius = (Fahrenheit - 32) x 5/9
- First remove the 32-degree offset, then scale by 5/9.
- This is the inverse of the Celsius to Fahrenheit converter.
Worked examples
Warm weather
Input: 86 F
Output: 30 C
(86 - 32) x 5/9 = 30.
Body temperature
Input: 98.6 F
Output: 37 C
(98.6 - 32) x 5/9 = 37.
FAQ
Why do we subtract 32 first?
Fahrenheit and Celsius have different zero points, so offset correction is required.
Can this return negative Celsius values?
Yes. Temperatures below 32 F convert to negative Celsius values.
Is 212 F equal to 100 C?
Yes. (212 - 32) x 5/9 equals 100.
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Updated: June 7, 2026