• Djehngo@lemmy.world
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    3 months ago

    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)

      • MisterFrog@lemmy.world
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        3 months 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

    • ricecake@sh.itjust.works
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      3 months 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.