The most widely used method is to choose a belt that is 1-2" larger than your pants size, or as some say: ONE SIZE UP. Example, if you wear a size 36 pants, you would choose a size 38 belt. Being we do not offer odd size belts (35, 37, 39, etc), you will choose a belt that is two inches larger. Size 34 waist choose a 36 size belt, 36 waist choose a size 38 belt, 38 waist choose a size 40 belt, etc.
If you wear an odd size pants, say a size 35, and sticking with the 1-2" rule, you would choose a size 36 belt. If you wear a 33 pants, order a size 34 belt, a 35 pants order a 36 belt, 37 pants order a 38 belt, etc.
Your belt size should be one size larger than your waist size.