Take your current belt and measure from the end where the leather folds over the buckle to the hole that you comfortably wear the belt on. If you plan on using this belt for carrying a gun, make sure that you measure to the hole that you use while doing so. Regardless if you used the current belt that you have or a piece of string, order the belt size that you measured. Example: Your current belt measures 38” from the end of the leather that folds over the buckle, to the hole that you most comfortably wear your belt on. You will need to order a size 38” belt.