How to convert degrees Celsius to kelvins
A kelvin and a degree Celsius are exactly the same size; the two scales only start from different zero points. To convert, add 273.15 to the Celsius temperature:
Mental-math shortcut: Just add 273.15 (or 273 for a rough figure): 25 °C = 298.15 K.
Example
Convert 25 degrees Celsius to kelvins: 25 °C: 25 + 273.15 = 298.15 K.
Celsius to Kelvin conversion chart
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 | 0 |
| -200 | 73.15 |
| -100 | 173.15 |
| -40 | 233.15 |
| -20 | 253.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 37 | 310.15 |
| 50 | 323.15 |
| 100 | 373.15 |
| 200 | 473.15 |
| 500 | 773.15 |
| 1,000 | 1,273.15 |
What is the Celsius scale?
The Celsius scale (°C) puts the freezing point of water at 0 °C and its boiling point at 100 °C at sea level. It is used for weather and everyday temperatures in almost every country. Normal human body temperature is about 37 °C.
What is the Kelvin scale?
The kelvin (K) is the SI base unit of temperature, used in science and engineering. The scale starts at absolute zero (0 K = −273.15 °C), the coldest possible temperature, so it has no negative values. Kelvins are written without a degree sign: water freezes at 273.15 K and boils at 373.15 K.
Converting the other way? Use the Kelvin to Celsius converter.
Frequently asked questions
What is 0 °C in K?
0 °C is 273.15 K.
How do I convert Celsius to Kelvin?
Use the formula K = °C + 273.15. For example, 25 °C is 298.15 K.
What is 100 °C in Kelvin?
100 °C is 373.15 K.
How do I convert Kelvin to Celsius?
Use °C = K − 273.15, or try our Kelvin to Celsius converter.
Conversions use the internationally agreed definitions of each unit (for example, 1 inch = 2.54 cm exactly) and are rounded for display. Volume converters use US customary units unless stated otherwise.
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