Freezing · 0 °C
273.2 K
Celsius to Kelvin Converter (Celsius to Kelvins)
K = °C + 273.15. 20 °C = 293.15 K.
Boiling · 100 °C
373.2 K
Body · 37 °C
310.2 K
Room · 20 °C
293.2 K
How to convert Celsius to Kelvin
Temperature scales have different zero points, so you can't just multiply: there's an offset too.
K = °C + 273.15
Example: 20 °C = 293.15 K. Water freezes at 0 °C and boils at 100 °C.
About the degree Celsius and the kelvin
Degree Celsius (°C)
The Celsius scale (also called centigrade) puts the freezing point of water at 0 °C and its boiling point at 100 °C at sea-level pressure. Formally it is defined from the kelvin: °C = K − 273.15.
Kelvin (K)
The kelvin is the SI base unit of temperature. 0 K is absolute zero; a change of 1 K equals a change of 1 °C.
1 degree Celsius in every temperature unit
Related conversions
Celsius to Kelvin FAQ
What is the formula for °C to K?
K = °C + 273.15.
How do I convert K back to °C?
Use the reverse formula: °C = K − 273.15. Or press the ⇄ button on the converter.
Can I print this Celsius to Kelvin chart?
Yes. Use "Print / Save PDF" next to the converter for a one-page chart, or "Download CSV" to open it in Excel or Google Sheets.