How to convert celsius to fahrenheit
Temperature conversion needs both multiplication and an offset. Unlike length or weight, zero Celsius is not zero Fahrenheit: 0°C equals 32°F.
Conversion formula
°F = (°C × 9 ÷ 5) + 32
Reverse: °C = (°F − 32) × 5 ÷ 9
For example, -40 °C = -40 °F.
Celsius to Fahrenheit conversion chart
Use these common reference values or the interactive calculator above for any number.
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 37 °C | 98.6 °F |
| 40 °C | 104 °F |
| 100 °C | 212 °F |
When is this conversion useful?
Weather reports in many countries use Celsius, while forecasts in the United States commonly use Fahrenheit. This converter also works for cooking and science examples.
For temperature differences rather than absolute temperatures, use a factor of 9/5 without adding 32. A change of 10°C is a change of 18°F.
Frequently asked questions
What is 20°C in Fahrenheit?
20°C is exactly 68°F.
What is 100°F in Celsius?
100°F is approximately 37.78°C.