A5 vs A6 Leather Journal: Which Size Should You Choose?

Short answer: A5 is 5.8" × 8.3" (14.8 × 21 cm) and A6 is 4.1" × 5.8" (10.5 × 14.8 cm) — exactly half the page. Choose an A5 leather journal if you want one comfortable main journal for daily writing, planning, work notes, study, or longer entries. Choose an A6 leather journal if you want a smaller refillable cover for travel, quick notes, lists, and everyday carry. If you want the tiny-carry setup, look at Pocket Size leather journals.

The real question is not only “which size is better?” It is where the journal will actually live: desk, work bag, small crossbody, travel pouch, or bedside table. That decides the size better than any abstract chart.

A5 vs A6: The Numbers

Both are ISO 216 sizes, which is why the relationship between them is exact rather than approximate. Fold an A5 sheet in half and you get A6. Fold A4 in half and you get A5. Every size in the A series keeps the same proportions, so the shape of the page never changes as it gets smaller.

	A5	A6
Paper size	5.8" × 8.3" (14.8 × 21 cm)	4.1" × 5.8" (10.5 × 14.8 cm)
Page area	About 48 sq in (311 cm²)	About 24 sq in (155 cm²) — exactly half
Line length	Full width, roughly 12–14 words	About 71% as wide, roughly 8–10 words
Lines per page	About 70% more than A6	About 70% of A5's line count
Asperaria cover size	6.3" × 9.1" (16.0 × 23 cm)	4.5" × 6.7" (11.4 × 17 cm)
Best use	Daily journal, planner, work notes, study notes, longer entries	Travel notes, quick thoughts, lists, compact everyday carry
Best buyer	Someone who wants one serious everyday notebook	Someone who wants a compact journal always nearby

The cover is always cut slightly larger than the paper so the notebook sits protected inside rather than level with the edges. That is why an Asperaria A5 cover measures 6.3" × 9.1" (16.0 × 23 cm) closed while the paper it holds is 5.8" × 8.3" (14.8 × 21 cm). Matching A5 inserts sit snugly on the elastics. Anything smaller will fit, but it will shift as you write. The A6 cover is 4.5" × 6.7" (11.4 × 17 cm) closed and holds A6 paper 4.1" × 5.8" (10.5 × 14.8 cm).

Which Notebooks Are A5 and A6?

If you already own a notebook, this is usually the quickest way to decide: match the format you already write in.

A5 notebooks: the Leuchtturm1917 Medium at 5.7" × 8.3" (14.5 × 21 cm), which is the standard bullet journal notebook; the Hobonichi Cousin; Rhodia, Clairefontaine, Stalogy and Muji A5 notebooks. A Moleskine Large is slightly narrower than true A5 and simply leaves a little more room at the sides.

A6 notebooks: the Hobonichi Techo Original at 4.1" × 5.8" (10.5 × 14.8 cm), the Midori MD A6, and A6 notebooks from Rhodia, Clairefontaine and Muji.

Because a refillable cover holds the notebook on elastic bands rather than clamping it into a fixed frame, brand does not matter and thickness is flexible. Match the format name and it works.

Choose A5 if you want your main writing journal

An A5 leather journal is the safer choice if you write more than a few lines at a time. It gives room for daily journaling, meeting notes, class notes, project planning, lists, and longer ideas.

A5 works best when the journal lives on a desk, in a backpack, in a work bag, or next to your laptop. For many buyers, this is the “one real journal” size.

A5 is best for:

• Longer journal entries and daily reflection
• Work notes, study notes, meetings, and planning
• Bullet journalling, which is built around the A5 page
• People with larger handwriting
• Gift buyers who want the journal to feel substantial
• A fuller refillable setup with inserts and organization

Choose A6 if portability matters more

An A6 leather journal is better when the journal needs to move with you. It is smaller, lighter, and easier to grab for quick notes, travel plans, field notes, or short daily entries.

A6 is best for:

• Travel notes and compact everyday carry
• Quick thoughts, quotes, ideas, and reminders
• Smaller bags and lighter setups
• People who write in short bursts
• A companion journal next to a larger A5 setup

Choose by where the journal will live

If the journal will live mostly on a desk, choose A5. If it will live in a small bag, coat pocket, travel pouch, or car console, choose A6. If it needs to be truly tiny, choose Pocket Size.

This matters more than page area, because the best journal is the one that is with you when you need it. An A5 that stays at home loses to an A6 in your coat.

What If Neither Feels Right? B6 and the Sizes Between

A5 and A6 are two steps apart on the ISO scale, which leaves a real gap. Plenty of people try both and want something in the middle.

• B6 paper is 4.9" × 6.9" (12.5 × 17.6 cm). The B6 leather cover measures 5.3" × 7.7" (13.5 × 19.6 cm) closed. It sits almost exactly between A5 and A6 — wide enough for a full sentence but short enough for a handbag.
• Regular Size inserts are 4.3" × 8.3" (11 × 21 cm), and traveler's notebook Regular refills are 4.3" × 8.3" (11 × 21 cm). The Regular leather cover measures 4.8" × 9.1" (12.2 × 23 cm) closed — the same height as A5 but much narrower.
• Pocket Size inserts are 3.5" × 5.5" (8.9 × 14 cm). The Pocket leather cover measures 4.3" × 5.9" (10.9 × 15 cm) closed, the smallest Asperaria cover that still takes a proper insert.
• B5 paper is 6.9" × 9.8" (17.6 × 25 cm) and A4 paper is 8.3" × 11.7" (21 × 29.7 cm). The covers are 7.5" × 10.6" (19.0 × 27 cm) closed and 8.9" × 12.6" (22.6 × 32 cm) closed — both desk formats for sketching and documents.

How refillable inserts affect the choice

Asperaria journals are built around a refillable leather cover system. The cover stays with you, while the paper insert can be replaced when it is full. A5 gives more room for multiple sections. A6 keeps the setup leaner. For extra organization, pair the cover with compatible leather journal inserts.

Worth knowing before you decide: an insert takes one of the elastic slots a notebook would otherwise use. On an A6 cover with three bands, adding a card-and-zip insert leaves you two notebooks. On A5 the same trade-off costs proportionally less, because each notebook holds twice as much.

Which size is better as a gift?

For gifts, A5 usually feels more substantial. A6 feels more personal and travel-friendly, especially for someone who likes compact carry or quick notes. Both sizes can work as personalized leather journals.

If you genuinely do not know how the recipient writes, A5 is the lower-risk choice. It is the format most people already own something in, so it will match notebooks they can buy anywhere.

When A5 is the wrong choice

A5 can be the wrong choice if you mostly write quick capture notes, carry very small bags, or avoid larger notebooks when you travel. In that case, A6 or Pocket Size will probably get more real-life use.

When A6 is the wrong choice

A6 can feel too small if you write long entries, use wide handwriting, plan across full-page spreads, sketch often, or want one notebook for both work and personal writing. If small notebooks make you feel cramped, go A5.

Best Asperaria collections to compare

• Leather Journals — browse all refillable leather journal covers
• A5 Leather Journals — best for daily writing and planning
• A6 Leather Journals — best for compact writing and travel
• B6 Leather Journals — the middle ground between the two
• Pocket Size Leather Journals — smallest carry option
• Regular Size Leather Journals — tall, narrow writing format

Final recommendation

Choose A5 if you want your main journal for writing comfort. Choose A6 if you want a compact journal you will actually carry. Choose Pocket Size if the goal is tiny everyday notes.

The clean rule: A5 for writing comfort. A6 for carrying comfort.

Frequently Asked Questions

What size is A5 in inches?

A5 is 5.8" × 8.3" (14.8 × 21 cm). That is half an A4 sheet and double an A6.

What size is A6 in inches?

A6 is 4.1" × 5.8" (10.5 × 14.8 cm). It is exactly half of A5.

Is A6 half the size of A5?

Yes, exactly. A5 is about 48 square inches of page and A6 is about 24. Fold an A5 sheet in half along its long edge and you have an A6. The proportions stay identical, so an A6 page is the same shape as an A5 page, just smaller.

What is the standard journal size?

A5 at 5.8" × 8.3" (14.8 × 21 cm) is the closest thing to a standard. It is the most common notebook format in Europe, the default for bullet journalling, and the size most sold notebooks are cut to. A6 is the standard for pocket carry.

Is A5 or A6 better for journaling?

A5 is usually better for longer journaling because it gives more room per page. A6 is better for short entries, quick notes, travel writing, and compact carry.

Is A5 too big to carry every day?

A5 is easy to carry in a backpack, work bag, or tote, but it is not as compact as A6 or Pocket Size. If your usual bag is small, A6 or B6 will get more use.

Is A6 big enough for daily notes?

Yes. A6 is big enough for daily notes, lists, ideas, and travel writing. Each line holds roughly 8 to 10 words against 12 to 14 on A5, so it suits short bursts rather than long-form writing.

Should I choose A5 or B6?

B6 at 4.9" × 6.9" (12.5 × 17.6 cm) sits between A5 and A6. Choose B6 if A5 feels too large for your bag but A6 feels too narrow for a proper sentence. It is the size most people settle on after trying both.

Are Asperaria A5 and A6 leather journals refillable?

Yes. Asperaria A5 and A6 journals are refillable leather cover systems, so you can replace the paper insert and keep using the same leather cover.