Tefillin Sizing

How to measure your Tefillin Box for Sizing:
METHOD ONE:
The bottom of your Tefillin Box may show the size.
These are the 4 standard sizes: 32-34, 35-37, 40-42, and 43-44.
If you would like a different size than these, it is considered
Custom.

METHOD TWO:
Place the TOP of your Tefillin Box
on a flat surface.
Line up 2 quarters alongside the edge of the TOP
(see photo for reference)

Here are the size equivalents:
1 1/3 (1.35) Quarters = Size 32-34
1 ½ (1.5) Quarters = Size 35-37
1 ¾ (1.75) Quarters = Size 40-42
Any size larger than 1¾ = Size 43-44