As an easy method for organizing fractional sizes in order from smallest to largest, an EDP number is used to represent each size as a numerical equivalent of 64ths. Using the selectors bleow, you can find the EDP equivalent of any fractional size. Numbering convention continues beyond the 2" diameter listed. Just substitute the whole inch diameter. Example: 236 = 2-9/16 : 336 = 3-9/16 : 436 = 4-9/16 etc.

Select Fractional size for EDP number
Fractional Size EDP Number Decimal Equivalent
1/64 to 1/2
001
.015625
33/64 to 1
033
0.515625
1-1/64 to 1-1/2
101
1.015625
1-33/64 to 2
133
1.515625