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.
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.
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)
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
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
This has blown my mind
Fucking Dan Brown in the comment section
A meter is a Baker’s yard. 3 free inches!
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.
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.