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Ring Binder Planning Guide
Determining Ring Binder Capacity

If you have a sample ring binder into which you know your materials will fit, open the binder and measure the inside dimensions of the round ring. For the "Angle D", measure the inside dimensions of the vertical post (see diagram). Do not measure the outside spine width.
If you do not have a sample ring binder, simply use the chart below to determine which ring metal capacity you will need.

Capacity (inside diameter)……holds approx.
1/2" ring size……………..….….100 pages
3/4" ring size……….......……….150 pages
1" ring size…………………..….200 pages
1 1/2" ring size……………........300 pages
2" ring size…………………..….400 pages
2 1/2" ring size……..…….……..500 pages
3" ring size………………...……600 pages
***Capacities are based on 20# bond paper***
Remember to add for any special pages or index tabs that may be added later!