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
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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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[–] hypeerror@sh.itjust.works 11 points 2 days ago

every 10 degrees Celcius is 18 Fahrenheit.

0c is 32

10 c is 32 + 18 or 50f

20c is 50 + 18 or 68f

30c is 68 + 18 or 86f

40c is 86 + 18 or 104f

Congrats you can now dress comfortably when you travel.