Fahrenheit to Celsius (F to C) Converter and Formula
To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9: °C = (°F − 32) × 5/9. For example, 100 °F = (100 − 32) × 5/9 = 37.777778 °C. Unlike simple unit ratios, temperature scales have different zero points, so this is an offset formula rather than a single multiplier.
The formula
Subtract 32, then scale by 5/9:
°C = (°F − 32) × 5/9
Example: (212 − 32) × 5/9 = 100 °CTo reverse it, use °F = °C × 9/5 + 32.
Conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| 0 | -17.777778 |
| 32 | 0 |
| 50 | 10 |
| 68 | 20 |
| 72 | 22.222222 |
| 98.6 | 37 |
| 100 | 37.777778 |
| 212 | 100 |
| 350 | 176.666667 |
How to convert online
- Type the Fahrenheit temperature into the first box.
- Read the Celsius value instantly in the second box.
- Or enter a Celsius value to convert back to Fahrenheit — it works both ways.
Use the Fahrenheit to Celsius Converter — free and instant in your browser.
Where this conversion is used
Fahrenheit-to-Celsius conversion is a daily need when travelling between the US and metric countries, reading weather forecasts, following recipes with oven temperatures, checking body temperature, and in science labs where Celsius is standard. The freezing point (32 °F = 0 °C) and boiling point (212 °F = 100 °C) are the reference anchors.
FAQ
What is 100 °F in Celsius?
100 °F equals 37.777778 °C, just below normal body temperature.
What is the formula to convert Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. Subtract 32 first, then multiply by 5/9.
What is 0 °F in Celsius?
Zero °F equals -17.777778 °C. The scales share the same reading at -40, where -40 °F = -40 °C.
How do I convert Celsius back to Fahrenheit?
Use °F = °C × 9/5 + 32, or use our reverse converter. Both share the same exact formula.
Related converters
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