How to convert Fahrenheit to Celsius
°C = (°F − 32) × 5/9. Example: (98.6 °F − 32) × 5/9 = 37 °C.
Fahrenheit to Celsius conversion table
| Fahrenheit (f) | Celsius (c) |
|---|---|
| -40 | -40 |
| -20 | -28.888889 |
| -10 | -23.333333 |
| 0 | -17.777778 |
| 10 | -12.222222 |
| 15 | -9.444444 |
| 20 | -6.666667 |
| 25 | -3.888889 |
| 30 | -1.111111 |
| 35 | 1.666667 |
| 37 | 2.777778 |
| 40 | 4.444444 |
| 50 | 10 |
| 100 | 37.777778 |
About the units
Fahrenheit (f) — the temperature scale used in the US, where water freezes at 32 °F and boils at 212 °F.
Celsius (c) — the metric temperature scale where water freezes at 0 °C and boils at 100 °C at sea level.
Frequently asked questions
What is the formula for Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. Example: (98.6 °F − 32) × 5/9 = 37 °C.
Is there a quick way to estimate it in my head?
Subtract 30 and halve it. For example, 80 °F → (80 − 30) ÷ 2 = 25 °C (exact: 26.7 °C).
Is this converter accurate?
Yes. It uses the internationally defined conversion factors (for example, 1 inch = 2.54 cm exactly and 1 pound = 0.45359237 kg exactly) and shows up to 10 significant digits.
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