Fahrenheit to Celsius
Enter a value in Fahrenheit and get the result in Celsius instantly.
1 °F = -17.2222 °C
How to convert Fahrenheit to Celsius
Temperature scales have different zero points, so conversion uses a formula rather than a single multiplier.
- °C = (°F − 32) × 5/9
Need the opposite direction? Use the Celsius to Fahrenheit converter.
Fahrenheit to Celsius conversion table
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.8889 °C |
| -10 °F | -23.3333 °C |
| 0 °F | -17.7778 °C |
| 10 °F | -12.2222 °C |
| 20 °F | -6.6667 °C |
| 25 °F | -3.8889 °C |
| 30 °F | -1.1111 °C |
| 37 °F | 2.7778 °C |
| 100 °F | 37.7778 °C |
Converting between temperature scales
- °F = (°C × 9/5) + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Why temperature is different
Most units convert with a single multiplier, but temperature scales start at different zero points. Celsius and Fahrenheit meet at −40°, the one temperature that reads the same on both scales. Kelvin shares Celsius’ degree size but starts at absolute zero.
Common questions
What is the formula to convert Fahrenheit to Celsius?
Use °C = (°F − 32) × 5/9. Temperature scales start at different zero points, so you cannot convert by multiplying alone.
Why can I not just multiply Fahrenheit by a single number?
A multiplier only works when both scales share a zero. Fahrenheit and Celsius do not, so the formula has to shift the value as well as scale it.
Is the conversion exact?
Yes. The relationship between the two scales is defined exactly; results are rounded only for display.