Celsius to Fahrenheit
One °C equals 33.8 °F. Type any number and the answer appears as you type — the maths happens in your browser.
The same value in every unit
| Unit | Value |
|---|
- Free
- Files never leave your device
- No sign-up
Common values
| Celsius | Fahrenheit |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °F |
| -10 °C | 14 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 50 °C | 122 °F |
| 100 °C | 212 °F |
| 200 °C | 392 °F |
How to use
- Enter the number of Celsius in the field.
- The result in Fahrenheit updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: °F = °C × 9/5 + 32. Going back the other way, one °F is -17.22222222 °C.
Why you cannot just multiply
Celsius, Fahrenheit and Kelvin start counting from different points, so a temperature is converted with a formula rather than a factor. That is why −40 is the same number in Celsius and Fahrenheit, and why a difference between two temperatures converts differently from a temperature itself.
°F = °C × 9/5 + 32
Frequently asked questions
How many Fahrenheit are in one Celsius?
One °C is 33.8 °F.
How do I convert Celsius to Fahrenheit?
Multiply by the factor: °F = °C × 9/5 + 32.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert Fahrenheit back to Celsius?
One °F is -17.22222222 °C — or open the reverse page linked below.