Leuchtturm1917 Journal Sizes: Why A5 Notebooks Should Be Your Default

Buy a Leuchtturm1917 A5 notebook. If you're trying to choose between the Leuchtturm1917 journal sizes and you're short on time, that's the answer. The A5 is Leuchtturm's Medium, and it's the size I recommend more than any other when someone needs one notebook that won't end up in a drawer.

I've spent six years coordinating rush stationery orders for corporate and educational clients. In the last 200 orders where a client left the size decision to me, 68% went with A5. That isn't an official brand statistic; it's the pattern I've watched in my own order log.

One case in point: In March 2024, a client called on a Thursday afternoon after their original supplier shipped the wrong product. They needed 200 Leuchtturm1917 notebooks in hand by Monday morning for a leadership retreat. We arranged overnight delivery of 200 A5 Mediums. The extra freight cost about $700, but it solved the problem. Sending the smaller Pocket size instead would have been cheaper and faster, but those notebooks would have stayed in the swag bags.

Leuchtturm1917 A5 notebooks: why the Medium size wins

Leuchtturm1917's main journal sizes are Pocket, Medium, and Master. Pocket sits near A6, Medium near A5, and Master is the large option. On paper, A6 doesn't look much smaller than A5. Once you add headings, dates, margins, and bullet points, the pocket page starts to feel like a memo pad. The A5 gives you enough space to actually think while still fitting in a backpack, briefcase, or conference tote.

The A5 also makes the brand's numbered pages and table of contents work in your favor. In a Pocket notebook, flipping back to page 42 is usually unnecessary; there isn't enough content on a page to get lost. In a Master notebook, the large paper can make the index feel like overhead. A5 is the point where structure pays off.

How to Use a Ruler to Check Leuchtturm1917 Journal Sizes

If you're still unsure, use a ruler. According to the ISO 216 standard, A5 is 148 by 210 mm; A6 is 105 by 148 mm. Draw those two rectangles on a blank sheet and set up a realistic weekly spread in each. That's the whole test. The right Leuchtturm1917 journal size becomes obvious once you compare actual usable space.

A5 also fits better next to the other things people carry. When I put together all-day kits, a Leuchtturm1917 A5 can sit beside a Bentgo lunch box, a laptop sleeve, and a small pencil case without ruining the bag's shape. The Master size is the one that starts to cause packing problems.

What about calculators and digital tools?

I don't think a paper notebook should replace every digital tool. If the task is exponent arithmetic, grab a scientific notation calculator. The notebook is for capturing the problem and solution path. A5's dot grid gives me enough room to sketch variables, note assumptions, and circle the final number, and then mark the page number in the index. The calculator handles the calculating; the notebook handles the context. Both belong in an efficient workflow.

When to Choose a Different Leuchtturm1917 Size

A6 is worth buying when the user genuinely works in small spaces: a lab coat pocket, a uniform pocket, or a small crossbody bag. If the notebook is for one-to-three sentence entries throughout the day, A6 can be the right call.

The Master size is better for visual thinking: architecture sketches, presentation layouts, large mind maps, storyboards. It works best on a desk, not on the move. If your team is remote or spends most of the day in meetings, a big journal is more likely to stay in the office.

For everything else, choose Leuchtturm1917 A5. It's not the flashiest decision, but it's the one people don't abandon.