Conversion from Celsius to Fahrenheit is done in three steps: 1. Multiply value in degrees Celsius by 9. 2. Divide result of step 1 by 5. 3. Add 32 to result of step 2. … Conversion formula: [°F] = [°C] * 9 / 5 + 32 = 220 * 9 / 5 + 32 = 428 °F.ou can use the formula Tc = (5/9)*(Tf-32) where Tc = temperature in degrees Celsius, Tf = temperature in d … egrees Fahrenheit.