Common problem we are experiencing is people ordering belts that are to small. Please follow the guide.
Best Method: Measure a belt currently being used.
Measure from the end of the buckle pin, to the hole currently being used.
OK Method: Measure the person that the belt is for.
Use a Soft Tape Measure around the waist at the height that the belt will be worn. The measurement (in inches) is the size you need.
'Not an ideal' Method: Estimate from Pants size.
Identify the pants size of the person the belt is for, then add 2 inches. e.g. size 38" Jeans would take a 40" belt.
Worst Method: Guessing.
This is where it usually goes wrong and only the courier wins.