How many degrees Celsius in 21 kelvins?

How to convert 21 kelvins to degrees Celsius using the formula?

1 kelvin equals 1 degree Celsius. The difference between the scales is only in the starting point. To convert the temperature 21 kelvins from Celsius to kelvins, subtract a fixed value of 273.15 from the kelvins:

21 К - 273.15 = -252.15°С