How do you convert a temperature change from °F to °C?

To convert a temperature difference from Fahrenheit to Celsius, multiply the Fahrenheit difference by five ninths so ΔC equals ΔF times five over nine.

Think of it like shrinking a number because Celsius degrees are bigger than Fahrenheit degrees when measuring change, so you multiply by five ninths to get the same amount of warming or cooling in Celsius. If you have a ten degree Fahrenheit change, for example, you multiply ten by five ninths to get about five point six degrees Celsius. We do not convert temperature values the same way when there is an offset from zero because that involves the thirty two degree shift between scales, but differences ignore that shift. So for any change or difference in temperature, just multiply the Fahrenheit difference by five ninths to find the Celsius difference.

A common mistake is adding or subtracting thirty two degrees when converting a temperature change, which is unnecessary because that offset only applies to absolute temperatures, not differences, and you should avoid doing that. Another error is trying to use the conversion for single temperature readings without applying the offset when needed, so remember that differences use only the ratio and full temperatures need both ratio and offset; check whether you are converting a change or a specific temperature. A quick tip is to ask yourself if you are comparing how much warmer or cooler something got; if yes, use ΔC equals ΔF times five ninths.

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Convert °F Temperature Change to °C

1. Multiply by 5/9
2. Celsius degrees are larger
3. Differences ignore the 32°F offset
4. Use ratio for changes
5. Avoid offset for differences

Common Temperature Conversion Mistakes

1. Adding or subtracting 32°F unnecessarily
2. Using change formula for full temperatures
3. Confusing differences with absolute values

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