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Who even uses Celsius (programming.dev)

submitted 2 years ago by [email protected] to c/[email protected]

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[–] scutiger 6 points 2 years ago (1 children)

Remember the easy round estimates for common numbers. 30F/0C is the freezing point, room temperature is around 70F/20C, very hot weather is 100F/40C, boiling point is 210F/100C, -40 is where they both converge.

It's actually 32/0, 68/20, 100/37, and 212/100, but these are close enough. The actual conversion is C=(F-32)/95, or F=C5/9+32

[–] bandwidthcrisis 3 points 2 years ago

For C to F, double it, subtract a 10th of the result, add 32.

E.g. 20 double is 40, minus a 10th is 40-4, so 36, add 32 giving 68.

If you ignore fractions when you take the tenth, you can do it in your head to be pretty close.

17, x2 is 34 a 10th is about 3, so 34-3 is 31, +32 is 63 (actually 62.6).