Do you need to convert Fahrenheit to Kelvin . The most likely reason is that someone assigned you a homework question for practice. Here is the formula for converting Fahrenheit to Kelvin. Next, two example problems show how to convert Fahrenheit to Kelvin and then Kelvin to Fahrenheit.
Fahrenheit to Kelvin Conversion Formula
There are a few different ways of writing the Fahrenheit to Kelvin conversion formula. It does not matter which one you use, so choose the one that is easiest.
- K =
- K =
- K = /1.8 + 273.15
- K = /1.8
Note: some people drop the decimal from the Kelvin temperature and use “273” instead of “2713.15”. This is less precise, but usually close enough for most purposes.
How the Formula Works
The Fahrenheit to Kelvin conversion is essentially a two-step process, first converting Fahrenheit to Celsius and then Celsius to Kelvin.
The Kelvin temperature scale is an absolute temperature scale related to the Celsius temperature scale. The relationship between Kelvin and Celsius is the formula:
Remember, Kelvin does not use a degree symbol (
Now use the formula and convert Celsius to Fahrenheit
Put the second equation into the first equation.
This gives us a conversion factor to convert Kelvin to Fahrenheit.
Multiplying by 5/9 is the same as dividing by 1.8. So, you don’t need to work with fractions.
Convert Fahrenheit to Kelvin Example Problem
Question: The average body temperature of a person is 98.6
Solution: Plug 96.8 into
Answer: The average body temperature of a person is 310.15 Kelvin.
Kelvin to Fahrenheit Conversion Formula
To find a formula to convert Kelvin to Fahrenheit, just solve the previous equation for K. An easier method would be to use Celsius conversion factors as before.
This time, solve the Celsius to Kelvin for K
Celsius is converted to Fahrenheit using the formula:
If we plug the first equation into the second equation, we get a formula to convert Kelvin to Fahrenheit.
This is the same equation you would get if you solved the Fahrenheit to Kelvin conversion forin the first section.
Convert Kelvin to Fahrenheit Example Problem
Question: Nitrogen is a liquid around 70 K. What is this temperature in Fahrenheit?
Solution: Plug 70 K into the conversion formula and solve for
Answer: 70 K is the same as -333.67