To find your belt size, measure your existing belt from the point where the strap loops over the buckle to the hole you currently use. That distance in inches is the belt size.
Odd sizes should round up to the next even size; even sizes should not round up. For example: if you measure a size 33, round up and order a size 34; but if you measure a size 34, don’t round up — just order a size 34.