A five dollar "foot long sub" and a ruler
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My foot is actually about 1 foot long!
A long time ago a king wanted to see how long his foot was. His foot was exactly 12 feet long so he called that a foot.
12 inches
AnswerThe volume of a box one foot long, one foot high, and one foot wide is 1 foot3 or 7.480519 liquid gallons.
I can think of no household item that is 1mm long. It would be very difficult to pick up and manipulate.