Converting between Fahrenheit and Celsius temperature scales is useful if you are working temperature conversion problems, work in a lab, or simply want to know how hot or cold it is in a country that uses the other scale! It's easy to make the conversion. One way is to look at a thermometer that has both scales and simply read the value. If you're doing homework or need to do a conversion in a lab, you'll want the calculated values. You can use an online temperature converter or else do the math yourself.

## Celsius to Fahrenheit Degrees

The formula to convert Celsius to Fahrenheit is:

**F = 1.8 C + 32**

- Multiply the Celsius temperature by 1.8.
- Add 32 to this number.
- Report the answer in degrees Fahrenheit.

Example: Convert 20°C to Fahrenheit.

- F = 1.8 C + 32
- F = 1.8 (20) + 32
- 1.8 x 20 = 36 so F = 36 + 32
- 36 + 32 = 68 so F = 68°F
- 20°C = 68°F

## Fahrenheit to Celsius Degrees

It's easy to work the conversion the other way. The formula to convert Fahrenheit to Celsius is:

**C = 5/9 (F-32)**

- Subtract 32 from the degrees Fahrenheit.
- Multiply the value by 5.
- Divide this number by 9.
- Report the answer in degrees Celsius.

Example: Convert body temperature in Fahrenheit (98.6°F) to Celsius.

- C = 5/9 (F-32)
- C = 5/9 (98.6 - 32)
- 98.6 - 32 = 66.6 so you have C = 5/9 (66.6)
- 66.6 x 5 = 333 so you have C = 333 / 9
- 333 / 9 = 37°C
- 98.6°F = 37°C

## Converting to the Kelvin Scale

Other common conversions are between Fahrenheit and Kelvin and between Celsius and Kelvin: