You may have the need to convert a temperature reading in Fahrenheit to the Kelvin absolute temperature scale. The most likely reason is that someone assigned you a homework question for practice. These two example problems show how to convert Fahrenheit to Kelvin and Kelvin to Fahrenheit.

### Fahrenheit to Kelvin Conversion Formula

The Kelvin temperature scale is related to and defined by the Celsius temperature scale. The relationship between Kelvin and Celsius is expressed by the formula:

K =

Remember, Kelvin does not use a degree symbol (

Now use the formula to convert Celsius to Fahrenheit

^{5}_{9}

Put the second equation into the first equation.

K = ^{5}_{9}

This gives us a conversion factor to convert Kelvin to Fahrenheit.

### Convert Fahrenheit to Kelvin Example Problem

**Question:** The average body temperature of a person is 98.6

**Solution:** Plug 96.8 into

K = ^{5}_{9}

K = ^{5}_{9}

**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:

^{9}_{5}

If we plug the first equation into the second equation, we get a formula to convert Kelvin to Fahrenheit.

^{9}_{5}

This is the same equation you would get if you solved the Fahrenheit to Kelvin conversion for

in 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

^{9}_{5}

^{9}_{5}

^{9}_{5}

**Answer:** 70 K is the same as -333.67