- 1). Set up the equation. In this example "F" stands for degrees Fahrenheit, and "C" stands for degrees Celsius. The equation for converting between the two measurement systems is F = (9/5)C + 32.
- 2). Translate the (9/5) value into a decimal. If you divide 9 by 5, you get 1.8. Substitute 1.8 for (9/5) to get F = 1.8C + 32.
- 3). Enter the value for Celsius into the equation. For example, if it is 22 degrees Celsius outside and you want to know how warm that is in Fahrenheit, set up the equation this way: F = 1.8(22) + 32.
- 4). Solve the equation. First, multiply 1.8 by the Celsius value, which in this case is 22. The answer comes out to be 39.6. After that, add 32 to get the overall total of the conversion from Celsius to Fahrenheit. In this case, 22 degrees Celsius is equal to 71.6 degrees Fahrenheit.