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Fahrenheit to Celsius converter
Enter a number, fraction, power, π, or arithmetic expression.1 °F = -17.2222222222 °C °C = (°F − 32) × 5/9
Ready for local conversionFahrenheit to Celsius formula
°C = (°F − 32) × 5/9
Subtract exactly 32, then multiply by exactly 5/9
The 32-degree offset aligns the freezing point of water, and the 5/9 scale ratio accounts for the different degree sizes.
How to convert Degrees Fahrenheit to Degrees Celsius
Subtract 32 from the Fahrenheit reading, then multiply the remainder by 5/9. Apply the steps in that order to preserve the correct zero-point adjustment.
Example calculation
A temperature of 68 °F is exactly 20 °C: (68 − 32) × 5/9 = 20.
68 °F = 20 °C
When this conversion is useful
Fahrenheit to Celsius is useful for international forecasts, medical readings, recipes, heating controls, and translating US temperature guidance.
Common Degrees Fahrenheit to Degrees Celsius conversions
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| -40 | -40 |
| 32 | 0 |
| 68 | 20 |
| 98.6 | 37 |
| 212 | 100 |
| 350 | 176.666666667 |
Fahrenheit to Celsius FAQ
Subtract 32 from Fahrenheit and multiply by 5/9: °C = (°F − 32) × 5/9.
The commonly cited 98.6 °F body temperature equals exactly 37 °C.
Fahrenheit has a different zero point as well as a different degree size, so both the 32 offset and 5/9 scale are required.