The Celsius to Fahrenheit Formula
The exact formula with worked examples.
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Convert Fahrenheit ↔ Celsius instantly. Two-way, with common reference values.
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Quick references
How to convert Fahrenheit to Celsius
The formula is straightforward: subtract 32 from the Fahrenheit value, then multiply by 5 and divide by 9.
°C = (°F − 32) × 5 / 9
Going the other direction — Celsius to Fahrenheit — multiply by 9/5 then add 32.
°F = (°C × 9 / 5) + 32
When you need this converter
Temperature conversion comes up in cooking (US recipes in Fahrenheit, European ovens in Celsius), weather (travelling between countries), and medicine (understanding fever thresholds). The quick-reference buttons above cover the most common reference points.
Frequently asked questions
- What is the formula to convert Fahrenheit to Celsius?
- Subtract 32 from the Fahrenheit value, then multiply by 5/9. The formula is: °C = (°F − 32) × 5/9.
- What is 100°F in Celsius?
- 100°F is approximately 37.78°C — just above normal human body temperature (37°C).
- What is normal body temperature in Fahrenheit?
- Normal body temperature is 98.6°F (37°C). A temperature of 100.4°F (38°C) or higher is generally considered a fever.
- What is 0°C in Fahrenheit?
- 0°C is 32°F — the freezing point of water at standard atmospheric pressure.