K = C + 273.15
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From Celsius to Kelvin: add 273.15. From Kelvin to Celsius: subtract 273.15. For most purposes, this can be rounded to 273.
Kelvin = celsius + 273.15
0*C = 273.15 K So just subtract 273.15 from Celsius to get Kelvin.
[°Celsius] = [Kelvin] − 273.15
T (f) = 9/5 (T (k) - 273.15) + 32