this post was submitted on 02 Nov 2025
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LPT: Easy way to convert Celsius to Fahrenheit (lemmy.world)
submitted 2 days ago by xylogx@lemmy.world to c/lifeprotips@lemmy.world
12 comments fedilink hide all child comments
 

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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[–] ook@discuss.tchncs.de 31 points 2 days ago (1 children)

"Easy"

[–] xylogx@lemmy.world 10 points 2 days ago (1 children)

Ok maybe a bit of a stretch, but definitely easier than directly calculating 9/5ths.

[–] panda_abyss@lemmy.ca 10 points 2 days ago (1 children)

9/5 is easy though, you double then subtract a tenth