how to convert fahrenheit to celsius and kelvin
1 Say '373 Kelvin' instead of '373 degrees Kelvin'. 2  For very precise conversions use 273.15 instead of 273. 3  To convert from Fahrenheit when there's no need to be precise I just take the temperature in Fahrenheit, subtract 32, and divide by 2. Eg: (100F-32)/2=34Â°c.