The best way to determine belt size (external waist size) is by measuring an existing belt strap.
Measure an existing belt strap from the fold at the buckle end of the strap to the hole used most when wearing.
For a full detailed example of how to measure your waist for a new leather belt please click the following link:
* Belt Size IS NOT the total length of the leather belt strap.
** Made to Measure Leather Belt Straps are non returnable.