Celsius to Kelvin Converter
K = °C + 273.15
Written without a degree sign: 300 K, not 300 °K.
1 degree Celsius equals 274.15 kelvins
How to convert Celsius to Kelvin
These formulas convert temperature readings. For a temperature difference, use only the scale factor: do not add or subtract the zero-point offset.
K = °C + 273.15The two scales use degrees of the same size, so converting is only a shift of the zero point by 273.15.
293.15 K = 20 + 273.15Written without a degree sign: 300 K, not 300 °K.
Celsius to Kelvin conversion table
Common values in degrees Celsius, converted to kelvins.
| Degrees Celsius (°C) | Kelvins (K) |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 37 | 310.15 |
| 50 | 323.15 |
| 100 | 373.15 |
Frequently asked questions
Is a change of 1 °C the same as a change of 1 K?
Yes. A change of 1 °C is a change of 1 K. Their degree sizes are equal; their zero points differ.
About these units
degree Celsius°C
Water freezes at 0 °C and boils at 100 °C at standard atmospheric pressure. The everyday scale in most of the world.
kelvinK
The SI base unit of thermodynamic temperature. Its zero is absolute zero, so kelvin values are never negative.
Reference: BIPM SI Brochure (9th ed.).
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.