Kelvin to Celsius (K to °C)
Convert K to °C — Temperature converter
Also written as K to C.
°C = K − 273.15.
Kelvin (K) is the SI base unit of temperature; Celsius (°C) is the everyday metric scale. Because both use the same degree size, converting Kelvin to Celsius just subtracts the offset: °C = K − 273.15.
Kelvin is measured from absolute zero, so 0 K = −273.15 °C. Water freezes at 273.15 K (0 °C), and a comfortable room around 300 K is about 26.85 °C.
-272.15Click to copy
1 K = -272.15 °C
Kelvin to Celsius formula
°C = K − 273.15
Worked examples
- 25 K = -248.15 °C
- 100 K = -173.15 °C
Common uses
- Turning a Kelvin lab or physics value back into °C
- Interpreting scientific data in familiar units
- Checking thermodynamic results
Kelvin to Celsius conversion table
| Kelvin (K) | 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 |
| 40 | -233.15 |
| 50 | -223.15 |
| 75 | -198.15 |
| 100 | -173.15 |
| 180 | -93.15 |
| 200 | -73.15 |
Frequently asked questions
What is the formula to convert Kelvin to Celsius?
°C = K − 273.15.
What is 0 K in Celsius?
0 K = −273.15 °C — absolute zero, the lowest possible temperature.
What is 300 K in Celsius?
300 K = 26.85 °C, roughly room temperature.
What is 273.15 K in Celsius?
273.15 K = 0 °C, the freezing point of water.