What is the Fahrenheit to Celsius conversion formula?

• A. C=(F+32)/1.8
• B. C=(F-32)/1.8
• C. C=(F-32)*1.8
• D. C=(F-32)/1.2

Answer: (B)

To convert Fahrenheit to Celsius, you start by removing the offset of the freezing point, since 32°F corresponds to 0°C. Then you scale by the Fahrenheit-to-Celsius ratio, which is 9 Fahrenheit degrees for every 5 Celsius degrees, so you multiply the remaining difference by 5/9. Practically, that means C = (F − 32) ÷ 1.8, which is the same as C = (F − 32) × 5/9. This is why subtracting 32 first and then dividing by 1.8 is the correct approach. The other forms don’t fit: adding 32 reverses the offset, multiplying after subtracting (instead of dividing) overestimates the value, and dividing by 1.2 uses the wrong ratio.