Kelvin to Celsius Converter
Convert kelvins to degrees Celsius instantly. Type a value, change either unit, or press swap to go the other way.
20 kelvins = -253.15 degrees Celsius
How to convert kelvins to degrees Celsius
°C = K − 273.15
Temperature scales have different zero points, so the conversion needs both a multiplication and an offset rather than a single factor. Apply the formula above in the order shown.
Worked examples
- 100 K: 100 − 273.15 = -173.15 °C
- 233.15 K: 233.15 − 273.15 = -40 °C
- 273.15 K: 273.15 − 273.15 = 0 °C
Subtract 273 (or 273.15 for precision). Since a kelvin and a Celsius degree are the same size, a temperature difference is the same in both.
Kelvin to Celsius conversion table
Kelvins to Degrees Celsius
| K | °C |
|---|---|
| 0 | -273.15 |
| 77 | -196.15 |
| 100 | -173.15 |
| 233.15 | -40 |
| 273.15 | 0 |
| 293.15 | 20 |
| 300 | 26.85 |
| 310.15 | 37 |
| 373.15 | 100 |
| 1,000 | 726.85 |
Degrees Celsius to Kelvins
| °C | K |
|---|---|
| 0 | 273.15 |
| 77 | 350.15 |
| 100 | 373.15 |
| 233.15 | 506.3 |
| 273.15 | 546.3 |
| 293.15 | 566.3 |
| 300 | 573.15 |
| 310.15 | 583.3 |
| 373.15 | 646.3 |
| 1,000 | 1,273.15 |
When you need to convert kelvins to degrees Celsius
Science textbooks, color-temperature ratings for lighting and cryogenic specifications use kelvins. Converting to Celsius gives you a number you can relate to everyday experience, such as the temperature of a room or a freezer.
About the units
Kelvin (K)
Kelvin is the SI base unit of temperature. Zero kelvin is absolute zero, the coldest possible temperature, and one kelvin has the same size as one degree Celsius.
Degree Celsius (°C)
Celsius sets 0 °C at the freezing point of water and 100 °C at its boiling point at sea level. It is used for weather, cooking and everyday temperatures in nearly every country.
Frequently asked questions
What is the formula to convert kelvins to degrees Celsius?
Use °C = K − 273.15. For example, 233.15 K becomes -40 °C.
What is 300 K in degrees Celsius?
300 K is 26.85 °C, a warm room temperature. Room temperature of 293.15 K is exactly 20 °C.
Can I convert other temperature units with this tool?
Yes. Use the From and To drop-downs in the converter to choose any temperature unit, or press the swap button to reverse the conversion. All calculations use internationally defined conversion factors.