Celsius to Kelvin

This converter makes instant conversions from Celsius (°C) to Kelvin (K). It also provides the conversion steps. To use the converter, please provide a value in the input field. The converter will begin making conversions as the values are being typed in.

Celsius and Kelvin are the two units of temperature used within the International System of Units (SI). The Kelvin scale is an absolute thermodynamic temperature scale, meaning it uses absolute zero as its zero point. The definition of the Celsius scale has changed throughout history. Between 1954 and 2019, the degree Celsius was defined based on absolute zero and the triple point of Vienna Standard Mean Ocean Water (VSMOW); this definition is precisely related to the Kelvin scale. Since 2019 the kelvin has been re-defined to be based on the Boltzmann constant rather than the triple point of VSMOW, but since the value of the Boltzmann constant was selected such that the measured value of the VSMOW remained exactly the same, this redefinition, pragmatically, does not change the relationship between the various temperature scales. The Kelvin scale is a scale that is largely used in the sciences.

How to convert Celsius to Kelvin

The scale of the kelvin is the same as the Celsius scale, meaning that a change of 1°C is the same as a change of 1 K. To convert from Celsius to Kelvin, just add 273.15 to the Celsius value:

K = °C + 273.15

For example, the water boiling temperature of 100°C at 1 atm can be converted from Celsius to Kelvin as:

100°C = (100 + 273.15)K = 373.15K