Use this equation to convert Celsius/Centigrade to degrees Kelvin: [K] = [°C] + 273.15
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Kelvin = celsius + 273.15
From Celsius to Kelvin: add 273.15. From Kelvin to Celsius: subtract 273.15. For most purposes, this can be rounded to 273.
K = C + 273.15
Answer: 200 K = -73 ºC
0*C = 273.15 K So just subtract 273.15 from Celsius to get Kelvin.