Last updated: September 2026
Temperature conversion
Celsius to Fahrenheit (°C to °F)
Convert weather forecasts, oven settings, room temperatures, and scientific readings from Celsius to Fahrenheit.
1 °C
33.8 °F
°F = (°C × 9/5) + 32
The formula
How to convert celsius to fahrenheit
Apply °F = (°C × 9/5) + 32. For example, -40 °C equals -40 °F.
Precision
Accurate constants, readable results
OmniUnit calculates with the full stored conversion factor, then displays up to 12 significant digits.
Common celsius conversions
| Celsius | Fahrenheit |
|---|---|
| -40 °C | -40 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 100 °C | 212 °F |
Related temperature conversions
Frequently asked questions
What is the Celsius to Fahrenheit formula?
°F = (°C × 9/5) + 32. Multiply the Celsius temperature by 9/5 (1.8), then add 32. For example, 20 °C is (20 × 9/5) + 32 = 68 °F.
What is the Fahrenheit to Celsius formula?
°C = (°F − 32) × 5/9. Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, 68 °F is (68 − 32) × 5/9 = 20 °C.
How do I convert Celsius to Fahrenheit without a calculator?
Double the Celsius degrees, subtract a tenth of that doubled value, then add 32. For 20 °C: 40 − 4 = 36, plus 32 = 68 °F — the exact answer.
What is 0 degrees Celsius in Fahrenheit?
0 °C equals 32 °F — the freezing point of water. 100 °C equals 212 °F, the boiling point. These two anchor points let you sanity-check any Celsius-to-Fahrenheit conversion.