Step 7:
Know how to improvise measures with nearby objects
Just because you don't have a ruler or tape measure on hand, doesn't mean you can't make some terrific measure estimates. If you know the lengths of certain body parts, or other accessible objects, you'll always have a good standard of measure on hand.
One of the knuckles of your hand is probably close to one inch long. Likewise, the width of one of your fingernails is one centimeter.
A U.S. standard-size piece of paper is 8 1/2 by 11 inches, or 215mm by 275 mm. In other countries, A4 is the standard size, which is 210 by 297mm, or roughly 8 1/2 by 12 inches.
Take the most common paper currency in your country, and measure its length or width. Then you'll always have a reliable standard that's equal to a certain measure.
If you're very keen on measured body parts, other good ones are your forearm, the width of your palm, the lenght of your foot, and how many of your strides equals ten yards (or meters).
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