How to choose a binder ring size

Most binder orders that go wrong go wrong here. The ring is the only part of the book that has to hold a specific stack of paper, and it is the one spec people guess at. This is how we size rings on the floor: what the number means, what it holds, and what it costs to move up one.

One table

Everything a ring size decides, side by side — capacity, the spine panel your artwork designs to, and what the size does to the published vinyl price:

Three caveats that keep this table honest. Capacity is for 20# bond — heavier stock, coated sell sheets, and laminated inserts fill a ring well short of these counts, so count your actual stack in the actual stock. Spine allowances are provisional round-ring vinyl figures from the artwork specs page — build final art to the template that comes with your proof. And adders are flat per binder at every quantity tier; the full ladders are on the binders page.

Ring size is not spine width

A “2-inch binder” is a two-inch ring. It is not a two-inch spine. The ring is the inside diameter — the paper stack it will carry — and the spine has to be wider than that because it has to clear the hardware, the covers, and the hinges. Order a binder by spine width and you will get a book that holds less paper than you planned for; design cover art to the ring number and your spine copy will not fit the panel. The table above pairs them so neither happens.

Round, D, and angle-D

Round rings are the standard and the least expensive. Sheets ride on a curve, which wastes a little capacity in the middle of the ring and lets pages slide toward the low side of the stack. The hardware mounts to the spine, and rivets may be exposed there — where they are, spine art has to fit between them. Our published vinyl and turned-edge ladders are quoted on a 1” round ring.

D-rings hold more paper than a round ring of the same nominal size, because the sheets stack flat against a straight edge instead of fanning around a curve. Because the stack sits flat rather than fanned, pages lie flatter as the book fills. The hardware mounts to the back cover rather than the spine, which changes the spine allowance and the rivet positions, so do not assume the round-ring spine figures transfer. D-ring hardware adds $1.00 per binder on our vinyl ladder at any ring size.

Angle-D rings (also called slant-D) mount to the back cover like a D-ring and hold the stack square against it as the book grows — that’s our ring supplier’s own term for the hardware. An easy-load variant exists for thick books that load like a post binder; ask. Geometry is confirmed on your proof.

Leave room

A book filled to the last sheet will not shut. Size the ring for the content plus the tabs plus whatever gets added later. Index tabs take real space — a 10-tab bank of 90# index with mylar is not a rounding error, and the tab extension adds bulk at the edge where the book has to close. Our rule is simple: if your finished stack lands close to the capacity in the table, take the next size up.

What upsizing costs

Read the adder column before you agonize. Going from 1” to 1-1/2” is forty cents a book — $40 on a 100-piece order — which makes that step cheap insurance. Going from 1” to 2” is $3.00 a book, $300 on the same order, so that is the step worth actually measuring for. The jump in the adder between 1-1/2” and 2” is where the hardware and the cover blank both get materially bigger, and the ladder reflects it.

When to split into two volumes

Past 3” you are out of published ring sizes and, frankly, out of good binders — a 600-plus sheet book is heavy, hard to open one-handed, and hard on the hardware. Split it.

Splitting is not free. Two 1-1/2” volumes at 100 sets means 200 binders at $13.15 rather than 100 at $18.50, so the goods cost more even though the ring is smaller. Buy the split when the content genuinely exceeds a 3” ring, when the book gets used in the field, or when the set has a natural break — volume by year, by matter, by section — that a reader would want anyway. Do not buy it to save money on rings, because it won’t.

How to order

Pick the ring size on the order page and the ladder price with the adder is on screen. If you are between sizes, send the page count and the stock and we will size it for you the same business day. More product questions are answered on the FAQ.