Varies but there are a few standard sized 6, 12, 25 and 50 are most common.
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depends on the type of measure
With a tape measure or a yard stick.
With a "ruler" or "tape measure" calibrated in imperial units
A ruler or a tape measurer
A caliper is a tool used to measure distances (small ones typically). It is not a unit of measure. Your question is like asking how many feet are in tape measure or how many pounds are in a scale.