Celsius to Kelvin Converter
25 °C = 298.15 K.
Enter a value
Result
1 degree Celsius =
274.15 K
1 °C = 274.15 K
°F = °C × 9/5 + 32
The working
- Convert 1 °C to the base unit (kelvin): 274.15.
- Convert that to K: 274.15.
1 °C in every unit
Key reference points
- Water freezes
- 0 °C = 32 °F
- Room temperature
- 20 °C = 68 °F
- Body temperature
- 37 °C = 98.6 °F
- Water boils
- 100 °C = 212 °F
- Absolute zero
- −273.15 °C = 0 K
Conversion table
Degrees Celsius to Kelvins
| Degrees Celsius | Kelvins |
|---|---|
| -273.15 | 0 |
| -100 | 173.15 |
| -40 | 233.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 37 | 310.15 |
| 50 | 323.15 |
| 100 | 373.15 |
| 200 | 473.15 |
| 500 | 773.15 |
| 1,000 | 1,273.2 |
Kelvins to Degrees Celsius
| Kelvins | Degrees Celsius |
|---|---|
| -273.15 | -546.3 |
| -100 | -373.15 |
| -40 | -313.15 |
| 0 | -273.15 |
| 10 | -263.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 37 | -236.15 |
| 50 | -223.15 |
| 100 | -173.15 |
| 200 | -73.15 |
| 500 | 226.85 |
| 1,000 | 726.85 |
Formula and worked example
K = °C + 273.15
Convert 25 °C to K: using K = °C + 273.15, 25 °C = 298.15 K.
When you need this
Chemistry and physics formulas, such as the ideal gas law, need absolute temperatures in kelvin. Room temperature, 25 °C, is 298.15 K.
Questions people ask
What is 25 °C in K?
25 °C is 298.15 K.
What is the formula for degrees Celsius to kelvins?
K = °C + 273.15.
Why can't I just multiply by one number?
The scales start from different zero points, so you have to add or subtract an offset as well as scale the value.
How do I convert kelvins back to degrees Celsius?
Use the reverse conversion: 298.15 K is 25 °C.
Related conversions
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
Spotted a mistake? Tell us and we'll check it. How we check our calculators