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I generally just multiply miles * 1.5 for a rough approximation.



Adding 10% of the original number to that is often easy as well, and makes the estimate very close to the correct conversion.


Works great for kg/lb conversions too.

kg x2 + 10% = lbs

lbs /2 - 10% = kg

I've yet to find a fast one for C to F temp conversions though. It takes a bit longer to do the 9/5-5/9 + or - equation in your head.




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