How to Measure Your Belt Size
Measuring a well-fitting belt you already own is the best way to determine your belt size. Lay the belt on a clean, flat surface. Start the tape measure at the hole you use and measure to the end of the belt, where it meets the buckle. Belts are measured in inches and you should round to the nearest inch. If you measure 36 inches, you will want to purchase a size 36 belt.