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A good was of converting Celsius into Kelvin is to just add 273.15 to Celsius and you will get Kelvin. This is how I worked it out:

Celsius temperatures: Freezing: 0'C Boiling: 100'C.
Total gap: 100'.

Kelvin temperatures: Freezing: 273.15'K Boiling: 373.15'K
Total gap: 100'.

Therefore, because the gap is the same, you just have to add 273.15 to the Celsius temperature to get Kelvin, and vice-versa.

To convert Fahrenheit into Kelvin you need to do the following equation:

(Fahrenheit – 32) x 5/9 + 273.15 = Kelvin

The way I found this was that I did the formula from Fahrenheit into Celsius and added 273.15 to the end.