Many customers assume that their waist size for pants is
the same as their belt measurement. This isn't usually the case.
In order to make sure that you get a belt that fits you, please measure a
belt you currently wear. If you already have a heavy belt, and are
going to be wearing the same type of holster on your new belt as the old
one, it's just a straight measurement. If, on the other hand, you currently
wear a thin dress belt and don't wear a holster on it you'll probably want
to add an inch or two (depending on your pistol) to the length.
Measure from where the leather bends around the base of the buckle
down the belt to the hole you use. Add length to that figure if the
last part of the above paragraph applies. Whatever length you decide
on will become the middle hole of five on your new belt.