Convert Celsius to kelvin
K = °C + 273.15. 20 °C = 293.15 K.
K = °C + 273.15
Common values, converted exactly
| degrees Celsius (°C) | kelvins (K) |
|---|---|
| -273.15 °C | 0 K |
| -196 °C | 77.15 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| 1000 °C | 1273.15 K |
To convert Celsius to kelvin, apply K = °C + 273.15. For example, 20 °C = 293.15 K.
The Celsius scale is the kelvin scale shifted by exactly 273.15: °C = K − 273.15. The step is the same size on both, so a change of 1 K is a change of 1 °C. Absolute zero is 0 K, or −273.15 °C. A kelvin takes no degree sign: it is 300 K, not 300 °K.
Everything on this page is computed in your browser from the exact definitions above — the table is not a stored list of pre-rounded answers, and neither is the converter. For a unit not covered here, the full unit converter handles length, weight, volume, temperature and cooking measures.
How many kelvins is 20 °C?
20 °C = 293.15 K. K = °C + 273.15, so any amount converts the same way — the table on this page lists the values most often looked up.
What is the formula for converting Celsius to kelvin?
K = °C + 273.15. The Celsius scale is the kelvin scale shifted by exactly 273.15: °C = K − 273.15. The step is the same size on both, so a change of 1 K is a change of 1 °C. Absolute zero is 0 K, or −273.15 °C. A kelvin takes no degree sign: it is 300 K, not 300 °K.
Is the Celsius to kelvin conversion exact?
Yes. The Celsius and kelvin scales are defined against each other exactly, so the conversion introduces no error — only the rounding you choose to apply to the answer.
How do I convert kelvins back to degrees Celsius?
Use the reverse of the same relationship; the kelvin to celsius page has its own table and converter.