How to use the Temperature Converter
- Type the temperature you want to convert.
- Choose the unit you're converting from and the unit you want.
- Read the result instantly. Use the swap button to convert the other way.
- Check the tables below for every unit and common values.
What does this tool do?
Temperature scales don't share a zero point, so converting needs a formula rather than a single factor. Celsius and Fahrenheit meet at −40, where both scales read the same.
Kelvin starts at absolute zero (−273.15 °C), the coldest possible temperature, which is why it never goes negative. The converter warns you if a value would fall below absolute zero.
Why use it?
- Cooking, weather, science and travel conversions.
- Formula shown for every pair.
- Common temperatures table.
Common temperatures
Useful reference points:
| Description | °C | °F |
|---|---|---|
| Water freezes | 0 | 32 |
| Cool room | 18 | 64.4 |
| Room temperature | 21 | 69.8 |
| Body temperature | 37 | 98.6 |
| Hot day | 35 | 95 |
| Water boils (sea level) | 100 | 212 |
| Moderate oven | 180 | 356 |
The formula
°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
Privacy
The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.
Frequently asked questions
What's a quick way to convert °C to °F in my head?
Double the Celsius figure and add 30. It's close for everyday temperatures: 20 °C → about 70 °F (the exact answer is 68 °F).
Last reviewed by the M2Toolkit team.