How to use this converter
Enter a value in fahrenheit to calculate celsius. Results update as you type. You can swap the direction and choose the displayed precision.
Conversion formula
(°F + 459.67) × 0.555555555556 − 273.15 = °C
Here the starting unit is Fahrenheit (°F) and the result is in Celsius (°C). Temperature scales require offsets as well as scale factors. Values below absolute zero are rejected.
Worked examples
- 1 °F ≈ -17.22222222 °C
- 10 °F ≈ -12.22222222 °C
- 100 °F ≈ 37.77777778 °C
Available temperature options
Celsius (°C) · Fahrenheit (°F) · Kelvin (K) · Rankine (°R)
Unit conventions
Absolute temperatures use offsets. Kelvin begins at absolute zero; temperature intervals use a separate converter.
Frequently asked questions
Why can displayed results differ slightly?
Numeric results are rounded for display. Increase the precision setting to see more digits. Different unit conventions can also produce different results; check the complete unit label.
Can I convert in the opposite direction?
Use the swap control to reverse the selected units or bases.
Related tools
All temperature units · Browse all converters · Celsius to Fahrenheit