C to F.. Multiply by 1.8 then add 32.
F to C.. Subtract 32 then divide by 1.8
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Use this formula to convert degrees Fahrenheit (F) to degrees Celsius (C): [°C] = ([°F] − 32) × 5⁄9
F = C × 9/5 + 32 C = (F - 32) x 5/9
Minus 40. You can obtain this by using the conversion formula, for example, F = (9/5)C + 32, setting F = C (that is, replacing the F with C, or the other way round), and solving.
°Celsius to °Fahrenheit: [°F] = [°C] × 1.8 + 32
°Fahrenheit to°Celsius (or°Centigrade): [°C] = ([°F] − 32) × 5⁄9°Celsius (or°Centigrade) to°Fahrenheit: [°F] = [°C] × 1.8 + 32