alt Hacker NewsIt is hand to remember a few finger/knuckles/elbow/shoulder combinations for common measures. One of your phalanges should be ~1 inch, for example, and one of your finger nails is probably ~1 cm wide.
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adzm • last Wednesday at 7:15 PM
Or be like the mythbusters guy and get a ruler tattooed on your arm!
There's a reason that the English system of measurement had things like "hand" and "foot" - because when you're not measuring things exactly, close enough and commonly available is fine.