There are about 2.54 in an inch. is a unit of measurement used to measure lengths of a variety of things, as well as plant and bone sizes; among many other things.
When another person’s height is expressed it is natural to try and figure out what the equivalent of such height is. Doing the Math.
Metric Length – Math is Fun – Maths Resources
US and Metric Weights and Measures Compared
Saddle Dimensions — ISM