Degrees Celsius to kelvin – and kelvin to degrees Celsius
K = °C × 1 + 273.15
All units in this category
- 20°C
- 68°F
- 293.15K
Formula
Temperature is not converted with a simple factor but with a formula that also accounts for the zero point.
How to convert degrees Celsius to kelvin
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Degrees Celsius to kelvin – common values
| Degrees Celsius (°C) | Kelvin (K) |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 37 | 310.15 |
| 100 | 373.15 |
Kelvin to degrees Celsius – common values
| Kelvin (K) | Degrees Celsius (°C) |
|---|---|
| -40 | -313.15 |
| -20 | -293.15 |
| -10 | -283.15 |
| 0 | -273.15 |
| 10 | -263.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 30 | -243.15 |
| 37 | -236.15 |
| 100 | -173.15 |
About the units
Degrees Celsius. The degree Celsius is an SI unit with its own name, exactly the same size as the kelvin but with a shifted zero: a temperature in degrees Celsius is the temperature in kelvin minus 273.15. It is a legal unit in the EU and the standard in weather reports, cooking and medicine outside the US. The name was adopted in 1948, replacing “centigrade”. Water freezes at 0 degrees and boils at roughly 100, but the boiling point is no longer exactly 100: the scale is defined through the kelvin.
Kelvin. The kelvin is the SI base unit of temperature, fixed since 2019 by a defined value for the Boltzmann constant, 1.380649 × 10⁻²³ J/K. Its degree is the same size as the Celsius degree, but its zero is absolute: 0 K is −273.15 °C. It is a legal unit in the EU and the standard in physics, chemistry and engineering. Write “273 K”, never “273 °K” or “degrees kelvin”, since the degree sign was dropped in 1967.