Fahrenheit to Celsius
Convert fahrenheit (°F) to celsius (°C) instantly — with formula and reference table.
Quick answer: 1 °F = -17.222222 °C. To convert fahrenheit to celsius, apply °F × 0.555556 + -17.777778.
Converting fahrenheit to celsius
This converter changes a value in fahrenheit (°F) into celsius (°C). One fahrenheit equals -17.222222 °C. To convert Fahrenheit to Celsius, subtract 32 then multiply by 5/9. Room temperature of about 68–72 °F corresponds to roughly 20–22 °C. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
°C = °F × 0.555556 + -17.777778
Example
Convert 25 °F to °C: 25 × 0.555556 + -17.777778 = -3.888889 °C.
Fahrenheit to Celsius conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 1 °F | -17.222222 °C |
| 2 °F | -16.666667 °C |
| 3 °F | -16.111111 °C |
| 5 °F | -15 °C |
| 10 °F | -12.222222 °C |
| 20 °F | -6.666667 °C |
| 25 °F | -3.888889 °C |
| 50 °F | 10 °C |
| 100 °F | 37.777778 °C |
How to use this converter
- Enter a value in the fahrenheit (°F) field.
- Read the converted value in celsius (°C) below.
- Type into the °C field instead to convert in reverse, or use the swap button.
Frequently asked questions
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. °C = (°F − 32) × 5/9.
What is 98.6 °F in Celsius?
(98.6 − 32) × 5/9 = 37 °C — normal body temperature.
What is 100 °F in Celsius?
(100 − 32) × 5/9 = 37.78 °C.