Convert Fahrenheit to Celsius
1 °F = -17.2 °C. Type any value below for an instant conversion.
°C
-40 °F = -40 °C
Formula
°C = (°F − 32) × 5/9Worked example: 77 °F − 32 = 45, then 45 × 5/9 = 25 °C
Subtract 32 first, then multiply by 5/9 — doing it the other way round is the most common error. Water freezes at 32 °F and boils at 212 °F, a 180-degree span against Celsius’s 100.
Fahrenheit to Celsius conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| 0 °F | -17.8 °C |
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 68 °F | 20 °C |
| 72 °F | 22.2 °C |
| 85 °F | 29.4 °C |
| 98.6 °F | 37 °C |
| 100 °F | 37.8 °C |
| 212 °F | 100 °C |
Frequently asked questions
How many Celsius are in one Fahrenheit?
One Fahrenheit equals -17.2 Celsius.
How do I convert Fahrenheit to Celsius?
Use the formula °C = (°F − 32) × 5/9. For example, 77 °F − 32 = 45, then 45 × 5/9 = 25 °C.
Is this °F to °C conversion exact?
Yes — the formula is an exact definition, and results are rounded only for display.
What is the reverse conversion?
To go the other way, use the °C to °F converter.
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