# Converting temperature - fahrenheit to celsius

You're about to learn how to convert fahrenheit to celsius (also known as centigrade).

Fahrenheit and celsius are scales of temperature with units °F (degrees fahrenheit) and °C (degrees celsius).

## So what's the fahrenheit -> celsius formula?

If you know the temperature in °F, you can change it to °C using the formula

We'll use examples which are the reverse of those considered in celsius to fahrenheit - hopefully this will help you appreciate how easy it is to convert from one measure of temperature to another and back again!

## The freezing point of water is 32 degrees fahrenheit - what is it in degrees celsius?

Here's the calculation

°C

=  (°F  -  32)  x  5/9

=  (32  -  32)  x  5/9

=  0  x  5/9

=  0

i.e. the freezing point of water in degrees celsius is zero.

## Next what's the boiling point of water in °C if it's 212°F?

°C

=  (°F  -  32)  x  5/9

=  (212  -  32)  x  5/9

=  180  x  5/9

=  100

i.e. the boiling point of water's 100°C.

## A human's normal body temperature is 98.6°F - work out the equivalent temperature in °C

°C

=  (°F  -  32)  x  5/9

=  (98.6  -  32)  x  5/9

=  66.6  x  5/9

=  37

i.e. the equivalent temperature is 37°C.

## Calculate 14, 69.8 and 140 degrees fahrenheit in degrees celsius

Working through each of these calculations in turn gives

 °C  =  (°F  -  32)  x  5/9  =  (14  -  32)  x  5/9  =  -18  x  5/9  =  -10°C  =  (°F  -  32)  x  5/9  =  (69.8  -  32)  x  5/9  =  37.8  x  5/9  =  21°C  =  (°F  -  32)  x  5/9  =  (140  -  32)  x  5/9  =  108  x  5/9  = 60

## How about a fahrenheit to celsius chart?

Notice this is the same as the celsius to fahrenheit conversion chart only flipped!

You probably don't need two charts - just read left to right, or right to left, depending on which temperature scale you're converting from/to.

## Now have a go at your own °F to °C conversions

Changing fahrenheit into celsius becomes easier with a little practice. Why not add the results of your calculations to the °F to °C chart?

› Fahrenheit to celsius