Planner Insert Sizes Explained: A5, Personal, Pocket, and the Rest

Personal size paper measures 95 by 171 millimeters. Almost nobody knows that, including people who have carried a Personal binder for years, and it's why so many printed inserts come out a hair too wide and snag on the rings. Planner sizing looks like it should be simple. It isn't, because the names come from three different traditions that never agreed on anything.

Three traditions, one binder market

The A and B sizes (A5, A6, B6) come from the ISO paper standard, built on one elegant rule: cut a sheet in half across its long side and the proportions stay identical. A5 is half of A4. A6 is half of A5. The system is a century old and it's the reason European and Japanese stationery snaps together so cleanly.

Personal and Pocket come from the British organizer lineage that Filofax made standard. They follow no ratio and no rule; they're the shapes that fit a suit pocket and a handbag in a London office, frozen into a spec. Some brands call Personal "Bible size."

Half Letter is the American answer: a US Letter sheet cut in two. If you print at home in the States, it's the size with zero waste.

The six sizes, measured

Trim sizes, width by height. Print one page and check it with a ruler before you commit to fifty.

A5 and Half Letter look interchangeable and aren't. Half Letter runs 8 millimeters narrower and 6 taller, so A5 inserts rattle in a Half Letter binder and Half Letter pages jam an A5 one. FranklinCovey's Classic paper shares the Half Letter footprint, though their binders run seven rings instead of six.

Pick by where it lives, not by the paper

A binder you don't carry is a shelf ornament. So decide where the thing will physically sit, then buy the size that survives there. On a desk, go A5, or Half Letter if your printer thinks in US Letter. In a bag, B6 and Personal earn their keep. In a pocket, Pocket, and nothing bigger; you'll leave it home twice and then forever.

My planner is a MeePlus Personal Size binder. The tall, narrow page holds a full day list, the binder sits flat next to a keyboard, and the rings mean I can pull a finished project out instead of copying it forward. I wrote about how it fits the rest of my carry in the pocket notebook piece.

Check the rings before you buy paper

Within a size, six-ring patterns are standard across Filofax, Plotter, Sterling Ink, and most other binder brands, so paper moves between binders freely. Two caveats. Pocket rings drift a couple of millimeters between brands, so measure yours against a page you already own before printing a stack. And ring count is not ring pattern: a six-ring Personal page will never sit in a seven-ring Classic binder, no matter how close the paper size looks.

Print at actual size or don't bother

The most common failure in printed inserts is one checkbox: "Fit to page." Fit to page rescales the sheet, the trim marks land in the wrong place, and every hole you punch is off by the same few millimeters. Set the printer to 100 percent, print a single page, and put a ruler on it. If A5 doesn't measure 148 wide, fix the scale before page two.

Every insert in our store ships in all six ring sizes at $0.99 per size, or $3.99 for every size of a layout, with print-ready files for both A4 and US Letter. The filler pack (dot grid, square grid, lined) is free, and it's the cheapest way to test that your printer, ruler, and rings agree before you spend anything. A6 and B6 come unpunched, so punch them to match a page you already use. There are also fold-out inserts for Personal and Pocket rings that open wider than the binder itself.

Not sure which size fits how you actually plan? The planning type quiz takes two minutes and tells you what your system needs before you buy a binder for the person you wish you were.

Measure the rings, print at 100 percent, carry the size that fits your day. Everything else is decoration.