There's a new website called "Rules of Thumb" that collects and publishes rules of thumb. Like "MEASURING WITH A DOLLAR BILL: A US Dollar bill is 6 1/8" long. By folding back part of the margin of the bill or 1/8" you have a 6" long piece of paper. Folding this in half, thirds etc, you can easily measure 2", 3", 4" 6" et cetera very easily, and fairly accurately."
It's searchable and seems to have rules for just about everything.
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