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Metric monster (lemmy.world)
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[-] Mac@mander.xyz 0 points 2 weeks ago

1kg = double it and add a little lb
1lb = just under half kg

1cm = just under half in
1in = a little more than double cm

F vs C = give up

To easily convert between F and C, simply cool the thing down to -40° and you're good you go

[-] Grabthar@lemmy.world 1 points 2 weeks ago

For above freezing, terrestrial temperatures, Canadians have long depended on the "double it and add 30" rule to understand freedom temperature units while travelling.

[-] twopi@lemmy.ca 1 points 1 week ago

1 kg = 2 * lb + 1/5 * lb (lucky for us 5 is a prime factor of base 10)

[-] Onomatopoeia@lemmy.cafe 0 points 2 weeks ago

For F and C, there's a 10% variation from double/divide (5/9 vs 9/5).

So add or subtract 10% after doing that part.

[-] droans@midwest.social 1 points 2 weeks ago

It's exactly (C*9/5)+32. That's not a rough formula, it's exact.

this post was submitted on 27 Jul 2025
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