Celsius to Kelvin Converter

How the celsius to kelvin conversion works

The converter applies K = °C + 273.15. The kelvin and the degree Celsius are the same size — only their zero points differ. Zero kelvin (absolute zero, the coldest anything can be) sits at −273.15 °C, so you just add 273.15 to any Celsius figure. Going the other way, °C = K − 273.15.

Worked example: room temperature of 25 °C is 25 + 273.15 = 298.15 K, water boils at 100 °C = 373.15 K, and water freezes at 0 °C = 273.15 K. The calculator refuses anything below absolute zero — you cannot enter less than −273.15 °C or less than 0 K. For Fahrenheit, use our Fahrenheit to Celsius converter.