Kelvin to Celsius Converter
Convert kelvins (K) to degrees Celsius (°C). The two scales start at different zero points, so the conversion uses a formula rather than a single factor: °C = K − 273.15.
Formula: multiply the source value by -272.15
Quick Conversions
About this tool
The kelvin is the SI unit of temperature. 0 K is absolute zero, and a change of 1 K equals a change of 1 °C. On the Celsius scale, water freezes at 0 °C and boils at about 100 °C at sea-level pressure.
How to use it
- Type a value in kelvins in the first field. The unit menus start on K → °C.
- Read the result in degrees Celsius. It updates as you type; use Precision to choose how many decimals are shown.
- Press the swap button, or open the Celsius to Kelvin converter, to convert degrees Celsius back to kelvins.
°C = K − 273.15
K = °C + 273.15
Examples
0 K to °C (absolute zero)
Using °C = K − 273.15: 0 K = -273.15 °C.
273.15 K to °C
Using °C = K − 273.15: 273.15 K = 0 °C.
300 K to °C
Using °C = K − 273.15: 300 K = 26.85 °C.
Kelvins to degrees Celsius conversion table
| Kelvins (K) | Degrees Celsius (°C) |
|---|---|
| 0 | -273.15 |
| 200 | -73.15 |
| 250 | -23.15 |
| 273.15 | 0 |
| 283.15 | 10 |
| 293.15 | 20 |
| 298.15 | 25 |
| 300 | 26.85 |
| 310.15 | 37 |
| 373.15 | 100 |
Degrees Celsius to kelvins (reverse)
| Degrees Celsius (°C) | Kelvins (K) |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 15 | 288.15 |
| 20 | 293.15 |
| 25 | 298.15 |
FAQ
What is the formula to convert K to °C?
°C = K − 273.15. For example, 10 K is -263.15 °C.
How do I convert °C back to K?
Use the reverse formula, K = °C + 273.15.
Can a kelvin value be negative?
Not for ordinary temperatures. 0 K is absolute zero, the lowest possible temperature. The converter accepts any number so you can check calculations.
Is the conversion exact?
Yes. The scale definitions (0 °C = 273.15 K, and one Fahrenheit degree is 5/9 of a kelvin) are exact. Results are only rounded for display.