23mm is about 9/10 of an inch. That's about halfway between 7/8 and 15/16
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Ruler/Walking ruler thingy
The easy way to find the length of a pencil is to use a ruler to measure it. A "small" ruler might not make it, but a "regular" one foot ruler will do the job nicely.
It depends on .67 of which unit of length.
The answer will depend on how long the ruler is!