App Description

<img src="http://drr.ikcest.org/static/upload/b3/b38d6876-ee5b-11e9-a476-00163e0618d6_m.jpg" />

Usage example

Input data:

Hole diameter (D): 8

Center (C): 3

Opening ratio (OA): 711.111%

Per square inch: 0.141 holes