Using an existing belt, correct measurement begins from the place where the buckle connects to the belt and then to the center hole. The rest of the belt is not considered for measurement purposes. To ensure a perfect fit, belts are sized in inches and should be ordered 2 inches larger than your pant size. For example: if you wear 34" pants, you would order a 36" belt. Size 36 will fit down to 34" and up to 38".