Convert Kelvin to Celsius
K to °C · temperature conversion
What are kelvin and celsius?
Kelvin is the SI base unit of temperature, starting at absolute zero (−273.15 °C) with no negative values. Celsius sets water’s freezing point at 0° and boiling at 100° at sea level, and is used by most of the world. For reference: a comfortable room is about 21 °C (70 °F), and normal body temperature is 37 °C (98.6 °F).
How to convert kelvin to celsius
Temperature scales don't share a zero point, so you can't convert by a single multiplier — use the formula °C = K − 273.15. For example, 0K = -273.15°C, 37K = -236.15°C, and 100K = -173.15°C.
Kelvin to Celsius conversion table
| Kelvin (K) | Celsius (°C) |
|---|---|
| 0 | -273.15 |
| 10 | -263.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 30 | -243.15 |
| 37 | -236.15 |
| 100 | -173.15 |
FAQ
What is the formula to convert kelvin to celsius?
°C = K − 273.15. Temperature scales don't share a zero point, so you convert with this formula rather than a single multiplier.
What is 0 K in °C?
0 K = -273.15 °C, and 100 K = -173.15 °C.
Why can't I just multiply kelvin by a number?
Because Kelvin and Celsius start counting from different zero points, multiplication alone would give the wrong answer — you also have to shift the scale, which the formula above handles.