How to use Fahrenheit to Celsius
- Type a value in Fahrenheit.
- The result in Celsius appears instantly.
- Type in the second box to convert the other way.
How to convert Fahrenheit to Celsius
Use the formula °C = (°F − 32) × 5/9. Example: 25 °F = -3.8889 °C.
Common Fahrenheit to Celsius conversions
-10 °F = -23.3333 °C. 0 °F = -17.7778 °C. 37 °F = 2.7778 °C. 100 °F = 37.7778 °C.
Quick mental math
Quick estimate: subtract 30 and halve. For 80 °F that gives 25 °C (exact: 26.7 °C).
Where is °F to °C conversion used?
Temperature conversions matter for weather forecasts when travelling, oven settings in recipes, body temperature and fever checks, aquarium and pool care, and science or lab work.
What are Fahrenheit?
Fahrenheit is used mainly in the United States. Water freezes at 32 °F and boils at 212 °F. Normal body temperature is about 98.6 °F.
What are Celsius?
Celsius is the metric temperature scale. Water freezes at 0 °C and boils at 100 °C at sea level. It is used in most countries.
Fahrenheit to Celsius conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| -20 | -28.8889 |
| -10 | -23.3333 |
| 0 | -17.7778 |
| 5 | -15 |
| 10 | -12.2222 |
| 15 | -9.4444 |
| 20 | -6.6667 |
| 25 | -3.8889 |
| 30 | -1.1111 |
| 35 | 1.6667 |
| 37 | 2.7778 |
| 40 | 4.4444 |
| 50 | 10 |
| 60 | 15.5556 |
| 80 | 26.6667 |
| 100 | 37.7778 |
Frequently asked questions
What is 25 °F in Celsius?
25 °F = -3.8889 °C.
What is 0 °F in Celsius?
0 °F = -17.7778 °C.
What is 100 °F in Celsius?
100 °F = 37.7778 °C.
What is the formula for Fahrenheit to Celsius?
°C = (°F − 32) × 5/9.
Is the °F to °C conversion exact?
Yes. Temperature formulas are exact; results are rounded only for display. Note that temperature scales have different zero points, so you cannot convert by multiplying alone.
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