How to use the temperature converter
- Type a value in either box. Decimals with a comma or a point both work.
- Choose the units on each side, or press the arrows to swap them.
- The table below shows the value in every unit at once. Click a row to convert to that unit.
About temperature units
Temperature scales differ in both the size of a degree and where zero sits, so one factor is not enough. To go from Celsius to Fahrenheit, multiply by 9/5 and add 32: 25 °C is 77 °F. To go back, subtract 32 and multiply by 5/9.
Celsius is used for weather and cooking in most of the world, Fahrenheit for everyday temperatures in the US, and kelvin in science. Kelvin uses Celsius-sized degrees but starts at absolute zero, so 0 K is −273.15 °C. Rankine does the same for Fahrenheit: 0 °R is −459.67 °F.
A classic mix-up is converting a change in temperature. A rise of 10 °C is a rise of 18 °F, not 50 °F, because only the 9/5 applies to differences. The 32 only shifts the zero point.
Popular temperature conversions
Temperature units
| Unit | Symbol | Definition |
|---|---|---|
| Celsius | °C | °C = K − 273.15 |
| Fahrenheit | °F | °F = °C × 9/5 + 32 |
| Kelvin | K | The absolute scale: 0 K is absolute zero |
| Rankine | °R | °R = K × 9/5 |
Converting something else? The unit converter covers every kind of unit in one place.