Converting between Celsius and Fahrenheit There are two ways you can convert between Celsius and Fahrenheit 1. Use a thermometer. Look at the temperature gauge on a thermometer and find the equivalent temperature 2. Calculate using the two formulas below: Change Celsius to Fahrenheit: F = (1.8 x C) + 32 Example a) Estimate then calculate the conversion of (85 Fahrenheit (F) to Celsius (C). Calculated Answer: Conversion Formula (F-32) x 5/9-C C = (85-32) x 5/9 C= 53 x 5/9 C= 265/9 C= 29.1 More Change Fahrenheit to Celsius: C = (F-32) x