Using a belt you already wear, measure the distance from where the leather wraps around the buckle to the hole you are currently using. Round up to the next even number (for example, 35½", order size 36). Select this size when you order. See the picture below.
In addition, check the width of your belt loops to ensure that the width of your new belt will fit through the loops. See the section below, "About buckles," for more information.
Select a belt size that's one size up from your pants (waist) size, to the nearest even number. For example, if you wear size 34 pants, then order a size 36 belt.
If you are ordering a belt on which you intend to snap on your own buckle, follow these steps: