About the Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin for cooking, weather, science and travel.
Key features
- Convert Celsius, Fahrenheit and Kelvin
- Correct offset-based formulas, not just multiplication
- Negative temperatures supported
- Swap direction with one click
- All three scales shown at once
- Free, instant, no sign-up
Celsius, Fahrenheit and Kelvin
Temperature conversion trips people up because the scales start at different zero points. This converter applies the correct formulas, so you can check weather forecasts, oven settings, body temperature or lab values without mental math.
Formulas
| Conversion | Formula |
|---|---|
| °C → °F | °F = °C × 9/5 + 32 |
| °F → °C | °C = (°F − 32) × 5/9 |
| °C → K | K = °C + 273.15 |
| K → °C | °C = K − 273.15 |
| °F → K | K = (°F − 32) × 5/9 + 273.15 |
Reference temperatures
| Description | °C | °F | K |
|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 |
| Celsius = Fahrenheit | −40 | −40 | 233.15 |
| Water freezes | 0 | 32 | 273.15 |
| Room temperature | 20–22 | 68–72 | 293–295 |
| Normal body temperature | 37 | 98.6 | 310.15 |
| Fever (commonly) | 38 | 100.4 | 311.15 |
| Water boils (sea level) | 100 | 212 | 373.15 |
Oven temperatures
| Setting | °C | °F |
|---|---|---|
| Low | 150 | 300 |
| Moderate | 180 | 350 |
| Moderately hot | 200 | 400 |
| Hot | 220 | 425 |
| Very hot | 240 | 475 |
Quick mental estimate
For a rough °C to °F conversion, double it and add 30: 20 °C ≈ 70 °F (exact: 68 °F). It works best for everyday weather temperatures.
Related converters
Converting cooking quantities too? Use the Volume Converter and Weight Converter.
How to use the Temperature Converter
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.