Subtract 32 from the Fahrenheit temperature. For example, if the temperature is 86 degrees Fahrenheit, subtract 32 from 86 to get 54.
Multiply the result from Step 1 by 5. Continuing the example, multiply 54 by 5 to get 270.
Divide the result from Step 2 by 9. To complete the example, divide 270 by 9 to get 30. Therefore, 86 degrees Fahrenheit is equal to 30 degrees Celsius.