Temperature Converter
Convert temperatures among Celsius, Fahrenheit, and Kelvin. The form asks for a Value, From, and To, then returns the converted temperature and the remaining scale as a reference item.
Use this calculator for weather, cooking, lab notes, device settings, and science problems. For focused conversions, see the Celsius to Fahrenheit calculator or Celsius to Kelvin calculator. For heat-related unit work, the energy converter may also help.
How to use this calculator
- Enter the temperature value.
- Choose Celsius, Fahrenheit, or Kelvin as the source scale.
- Choose the target scale.
- Check that the input is not below absolute zero.
Conversion formula
Celsius is the middle step used by the form.
°F = (°C × 9 ÷ 5) + 32
°C = (°F − 32) × 5 ÷ 9
K = °C + 273.15
°C = K − 273.15
Worked example: 20°C converts to 20 × 9 ÷ 5 + 32 = 68°F. In Kelvin, 20 + 273.15 = 293.15 K.
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| 0°C | 32°F | 273.15 K |
| 20°C | 68°F | 293.15 K |
| 37°C | 98.6°F | 310.15 K |
| 100°C | 212°F | 373.15 K |