The best way to determine belt size (external waist size) is by measuring an existing belt.
Measure an existing belt from the end of buckle (buckle width included within the measurement) 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.
** Made to Measure Leather Belts are non returnable.