where K = Degrees in Kelvin and C = Degrees in Celcius
The Celsius and Kelvin scales use the same size degrees, but Kelvin has a zero point at absolute zero, not the freezing point of water. So Kelvin temperatures have values 273.15 degrees higher than the same temperature in Celsius.
Example : the boiling point of water is 100 °C , which is equal to 373.15 K