Convert Fahrenheit to Celsius
Convert Fahrenheit to Celsius instantly with the exact formula (°C = (°F − 32) × 5/9), a quick table and the reverse conversion.
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How to use Fahrenheit to Celsius Converter
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Open Fahrenheit to Celsius Converter on this page. It loads right in your browser.
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About this tool
This converter turns Fahrenheit into Celsius as you type, using the exact formula °C = (°F − 32) × 5/9. It is handy for weather forecasts, cooking and oven settings, body temperature and travel.
How to convert Fahrenheit to Celsius
Use the formula °C = (°F − 32) × 5/9.
°C = (°F − 32) × 5/9
Worked example
77 °F → 25 °C
Quick mental estimate
For a rough figure: double the Celsius value and add 30 (25 °C ≈ 80 °F). For the reverse, subtract 30 and halve.
Fahrenheit to Celsius table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| -10 | -23.3333 |
| 0 | -17.7778 |
| 10 | -12.2222 |
| 20 | -6.6667 |
| 25 | -3.8889 |
| 30 | -1.1111 |
| 35 | 1.6667 |
| 37 | 2.7778 |
| 40 | 4.4444 |
| 100 | 37.7778 |
| 180 | 82.2222 |
Quick reference
- -10 °F = -23.3333 °C
- 10 °F = -12.2222 °C
- 25 °F = -3.8889 °C
- 35 °F = 1.6667 °C
- 40 °F = 4.4444 °C
- 180 °F = 82.2222 °C
Where Fahrenheit and Celsius are used
Celsius is used for weather and cooking in most of the world, while the US uses Fahrenheit. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F); normal body temperature is about 37 °C (98.6 °F).
Tips
- Use the swap button to convert Celsius back to Fahrenheit.
- Choose 0 to 6 decimals; the full-precision value is used internally.
- The side panel also shows the value in every other unit of the same type.
Why use this converter
It is free, needs no sign-up and runs entirely in your browser, so it keeps working even offline once the page is loaded. Need the opposite? Use the Celsius to Fahrenheit converter or the full unit converter.
Features
- Instant Fahrenheit to Celsius conversion as you type
- Exact factor: °C = (°F − 32) × 5/9
- Quick conversion table of common values
- Swap button for Celsius to Fahrenheit
- Choose 0 to 6 decimal places
- Works offline in your browser
Frequently asked questions
How do I convert Fahrenheit to Celsius?
Use the formula °C = (°F − 32) × 5/9. 77 °F = 25 °C.
What is 212 °F in Celsius?
212 °F equals 100 °C.
Is the conversion exact?
Yes. The tool uses the internationally defined conversion factor and only rounds the displayed result to the decimals you choose.