this post was submitted on 02 Nov 2025
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LPT: Easy way to convert Celsius to Fahrenheit (lemmy.world)
submitted 3 weeks ago by xylogx@lemmy.world to c/lifeprotips@lemmy.world
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Double the number, then reduce by one-tenth the doubled number, then add 32

Example: To convert 25 C double it to 50, reduce by 5 to get 45, then add 32 to get 77 F.

The reason this works is because 9/5 = 10/5 - 1/5. And the nice thing about this is that it is an exact conversion not an estimation.

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[–] bdonvr@thelemmy.club 2 points 3 weeks ago (1 children)

What about negative numbers

[–] xylogx@lemmy.world 2 points 3 weeks ago (1 children)

Works just the same:

-10 C doubles to -20, reduce by -2 to -18, and add 32 to get 14 F.

[–] bdonvr@thelemmy.club 2 points 3 weeks ago

I think I was getting confused with the "reducing" a negative number. But yeah reducing a negative negatively moves it positively