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The only metric to imperial conversion I remember is kilometers to miles since it’s pretty close to the golden ratio.

Even if you don’t remember that the golden ratio is 1.6 and a bit, you can approximate it by using successive terms of the Fibonacci sequence.

1, 1, 2, 3, 5, 8, 13 …

So 8 miles is about 13km (actually 12.87)

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captainlezbian@lemmy.world ⁨1⁩ ⁨day⁩ ago
Its 2.54 cm to the inch. Its close to 2.5 and as an engineer in America I am stuck doing that conversion a lot

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- MisterFrog@lemmy.world ⁨7⁩ ⁨hours⁩ ago
  If it makes you feel any better, most pipe standards around the world are based on the American system, as well as bloody valve coefficients.
  
  I am far too aware that 1" is 25.4 mm :(
  
  And I’m in Australia. Grumble
  
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aarRJaay@lemmy.world ⁨1⁩ ⁨day⁩ ago
This has blown my mind

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- VolumetricShitCompressor@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago
  Fucking Dan Brown in the comment section
  
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  - jia_tan@lemmy.blahaj.zone ⁨1⁩ ⁨day⁩ ago
    Lmao your username is awesome
    
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    VolumetricShitCompressor@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago
    Thank you, kind stranger on the internet!
    
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    mere@lemmy.blahaj.zone ⁨1⁩ ⁨day⁩ ago
    and your username is scary
    
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ricecake@sh.itjust.works ⁨12⁩ ⁨hours⁩ ago
2.2 pounds per kilogram. For a rough conversion just multiply or divide by two. For a more precise conversation do the same thing, then wiggle a decimal and do it again.

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Peppycito@sh.itjust.works ⁨1⁩ ⁨day⁩ ago
A meter is a Baker’s yard. 3 free inches!

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Mirodir@discuss.tchncs.de ⁨1⁩ ⁨day⁩ ago
I usually just go with 1.5 because adding half/subtracting a third is way easier to do in my head, and I’m not worried about a ~10% error in casual conversation.

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notarobot@lemmy.zip ⁨1⁩ ⁨day⁩ ago
Forma me it’s the yard. It’s so close to the meter its ridiculous. I just ignore the difference an treat as the same. One yard = 0.9144 meters

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- bryndos@fedia.io ⁨18⁩ ⁨hours⁩ ago
  A yard is about 1.4 litres in my book, or 2.1/2 pints - imperial pints mind, not US ones.
  I'm not ignoring away that 20% difference; it's bad enough with all the fucking "pint to brim" glasses these days.
  
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  - notarobot@lemmy.zip ⁨16⁩ ⁨hours⁩ ago
    Liters? Pints? How are you converting from distance to volume?
    
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