Sara Grupe - Brand Marketing Coordinator, Leatherology
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Journal sizes are the first decision in a setup that lasts. Choose your format, then build around it with a well-made leather cover, a refill system you can restock, and inserts that hold together. Make those decisions once, and the setup carries you for years.
Where do you begin when the goal is a journal you will still reach for years from now?
The format you choose determines which covers, refills, and journal inserts will fit, which is why size comes before everything else. Most journals fail quietly. The spine cracks, the paper fights your pen, or the last page arrives and the whole thing goes on a shelf. A considered setup works the other way. The cover stays, the paper changes, and the system improves with every refill. So where do you begin when the goal is a journal you will still reach for years from now?
Start With the Size: Picking Your Format Before Anything Else
Size is the decision everything else depends on. Covers are cut to fit specific notebook sizes, refills are sold by format, and inserts only work when they match. With so many different notebook sizes on the market, choosing the format first makes every later choice simpler.
How Standard Notebook Sizes Work
There is no single standard notebook size, but most journals follow the ISO 216 paper system, where each size is half the area of the one above it. A5 is half of A4, and A6 is half of A5. B sizes sit between the A sizes, so B6 falls between A6 and A5. US Letter and Half Letter sit outside this system, so letter size notebooks and A-series covers are not interchangeable.
Matching the Size to Where You Write
Consider where the journal will live. A7, the smallest common format at 74 x 105 mm, fits a shirt pocket. Pocket notebooks vary by maker, but most fall between A7 and A6. A6 and other pocket size journal formats slip into a jacket or a small crossbody, which suits lists and quick notes. B6 is a compact middle ground for daily entries on the go. A5 balances page space with portability, which is why it anchors so many planners and refillable systems. The B5 journal size suits desk work, meeting notes, and anyone who writes at length. Letter size, at 8.5 x 11 inches, is the largest common format and is happiest on a desk.
A4 vs Letter: Why They Do Not Swap
A4 measures 210 x 297 mm, or about 8.3 x 11.7 inches, while US Letter measures 8.5 x 11 inches, or 216 x 279 mm. Letter is slightly wider and A4 is about 18 mm taller, so pages, punched refills, and covers made for one rarely fit the other cleanly. A4 is the everyday paper size in most of the world, while Letter is the standard in the US and Canada, which is why US journals and refills at this scale come in Letter.
A Quick Way to Choose Your Journal Size
Ask where the journal spends most of its day. If it rides in a pocket or small bag, choose A6 or B6. If it moves between home and work, choose A5, the most widely supported size for covers and refills. If it stays on a desk, choose B5 or Letter.
Traveler's Notebook Sizes
Leather travelers notebook covers use their own tall, narrow inserts. The regular traveler's notebook size measures about 110 x 210 mm, and the passport size about 89 x 124 mm. They are a distinct system, so A-series refills will not fit them. Decide which family you are building in before buying a single refill.
Journal and Notebook Size Chart
| Size | Dimensions (mm) | Dimensions (in) | Carry | Suits |
|---|---|---|---|---|
| A7 | 74 x 105 | 2.9 x 4.1 | Shirt or jacket pocket | Pocket notes, lists |
| A6 | 105 x 148 | 4.1 x 5.8 | Pocket or small bag | Lists, quick notes, travel |
| B6 | 125 x 176 | 4.9 x 6.9 | Small to medium bag | Daily entries on the go |
| Traveler's Regular | 110 x 210 | 4.3 x 8.3 | Small to medium bag | Travel logs, lists, slim inserts |
| A5 | 148 x 210 | 5.8 x 8.3 | Tote or work bag | Planners, journaling, all-purpose |
| Half Letter | 140 x 216 | 5.5 x 8.5 | Tote or work bag | US planners and inserts |
| B5 | 176 x 250 | 6.9 x 9.8 | Work bag or desk | Meeting notes, long-form writing |
| Letter | 216 x 279 | 8.5 x 11 | Desk or laptop bag | Desk notes, meetings, padfolios |
| A4 | 210 x 297 | 8.3 x 11.7 | Desk or laptop bag | Study notes, desk work outside the US |
A and B sizes reflect the ISO 216 standard, and Letter and Half Letter follow US paper sizes. B6 and B5 notebooks made to the Japanese JIS standard run slightly larger (JIS B6 is 128 x 182 mm and JIS B5 is 182 x 257 mm), so confirm the exact measurement before buying a cover. Traveler's notebook dimensions are approximate and vary slightly by maker.
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Choosing the Cover: Leather Types, Closures, and What Actually Wears Well
A journal cover is the one piece you keep, so it deserves the most scrutiny.
Journal Cover Sizes: Measure the Notebook, Not the Page
Journal cover sizes follow the notebook, not the paper. A cover labeled A5 is cut to hold an A5 notebook or binder, so it runs a little larger than the 148 x 210 mm page itself. Binding adds bulk too, since rings, spirals, and thick boards all widen the footprint. Before buying a cover for a notebook you already own, measure the closed notebook, including its thickness, and compare it with the cover's interior dimensions.
Leather Types
Full grain leather keeps the outermost layer of the hide intact. It is the most durable option and develops a patina with handling, so the cover looks more personal over time. Top grain leather is sanded for a more uniform surface. Bonded and coated alternatives tend to peel at the edges and corners, which is where a journal takes the most wear.
Closures
Snap closures keep the cover shut in a bag and hold loose pages in place. Wrap ties and elastic bands are simple and flexible but loosen with time. Zip closures add security at the cost of bulk. If your journal travels daily, a snap or zip keeps it intact. If it stays on a desk, an open cover is fine.
Details That Signal Longevity
Look for finished edges, reinforced stitching at stress points, and a pen loop or built-in pen holder that keeps its shape. Interior pockets and card slots turn an A5 leather journal cover into a small organizer for receipts, tickets, and business cards.
The Refill System: Paper, Rulings, and Never Getting Stranded
The refill is where a journal is actually used, so paper quality matters as much as the cover.
Paper Weight
Paper weight is measured in grams per square meter (GSM). Lighter paper is fine for ballpoints, but wet inks need more. Fountain pen writers should treat 80 GSM as a minimum, and 90 to 100 GSM is widely considered the range where most inks behave. Weight is not the whole story. Coated or calendered paper resists feathering even at lower weights, so look for an explicit "fountain pen friendly" note when you shop for good paper for fountain pens.
Rulings
Lined pages suit prose and long-form journaling. A dot grid journal keeps writing straight while leaving room for lists, sketches, and layouts, which is why it is the go-to page for bullet journaling. Blank pages give sketchers and planners total freedom. Grid, also called quad ruled, suits technical notes and tables.
Never Getting Stranded
Choose a widely supported format so an A5 journal refill is easy to find when you need one. Keep one spare refill on hand, and note your format and ring pattern somewhere you will remember. Running out is a minor inconvenience. Being unable to find a matching refill is what ends a journal setup.
Journal Size and Paper Facts
- The ISO standard specifies A5 at 148 x 210 mm, A6 at 105 x 148 mm, and B6 at 125 x 176 mm, all at a height-to-width ratio of the square root of two.
- Japan's JIS standard uses the same A series as ISO 216 but a slightly different B series.
- Each ISO paper size is half the area of the next larger size in the series.
- 80 GSM is the minimum most fountain pen users recommend, with 90 to 100 GSM as the ideal range, while coating, texture, and manufacturing also affect performance.
Sources: Markus Kuhn, University of Cambridge, International Standard Paper Sizes; Wikipedia, ISO 216; Pure Pens, Fountain Pen Paper Guide
Journal Inserts and Binding: How the System Holds Together
The binding determines how pages go in, come out, and lie under your hand.
Ring Binders
An A5 ring binder lets you add, remove, and reorder pages freely. You can mix lined, dot grid, and blank sheets in one book, add dividers, and file finished pages elsewhere. The trade-off is that rings can interrupt your writing hand on left-hand pages.
Ring patterns are not universal. A5 binders typically use 6 rings, while US Letter binders use the standard three ring layout. A leather three ring binder takes ordinary hole-punched Letter paper, but an A5 six ring binder needs pages punched to match, so buy refills by ring count as well as size.
Elastic Band Systems
Traveler's style covers hold slim stitched booklets with elastic cords. They stay light and flexible, and you can carry a planner, a notebook, and a folder in one cover.
Slip-In Covers
Slip-in covers hold a bound notebook by its front and back boards. They work well if you prefer a finished, stitched book and want to replace the whole notebook when it fills.
Spiral Bindings
A spiral journal lies completely flat and folds back on itself, which makes it easy to write in at a desk or on your knee. In a refillable leather cover, you swap the spiral notebook when it fills and keep the cover, as with the A5 Snap Spiral Journal. The coil can press against a left-handed writer's wrist, much like rings, and it adds width to the closed book, so check the cover's fit before you buy a replacement.
Stitched Versus Glued Bindings
Thread-stitched notebooks open flatter and hold up to repeated handling. Glued bindings can crack along the spine with heavy use. If a refill is bound, stitching is the more durable choice.
A Refillable Leather Journal Built Around the System
The A5 Binder Journal in Garnet Red is built on the principles above. A 6-ring binder lets you rearrange pages and mix rulings. A snap closure keeps everything secure in a bag. Card slots, interior pockets, and a built-in pen loop keep the essentials in one place. As an A5 leather binder journal, it accepts widely available A5 6-ring refill pages, so restocking stays simple. It can be personalized with debossed initials, making it as fitting for your desk as it is as a gift.
The full range of leather journals and planners comes in A5, B5, and Letter sizes, with matching journal refills for each format.
Making It Yours and Keeping It: Personalization and Leather Care
A journal you plan to keep for years should feel like yours from the first page.
Personalization
Debossed initials are the classic choice, and foil adds a quiet flash of color. Leatherology also offers Trapunto and hand paint for something more distinctive. If you are unsure which initials to use or how to order them, our guide to monogram etiquette tips and tricks walks through placement and traditional ordering. A monogrammed leather journal also makes a considered gift, since the recipient keeps the cover long after the first notebook fills.
Leather Care
Keep the cover away from prolonged heat and direct sun, which dry and fade leather. Wipe away spills promptly and let the leather air dry naturally. Condition occasionally to keep it supple. Avoid overstuffing the cover, which strains the spine and closure.
Refill, Do Not Replace
A lasting setup rewards working with what you already own, the same idea behind learning how to accessorize for fall without buying a thing. Swap the paper, keep the cover, and let the leather record every year you carry it.
How Leatherology Approaches Journals and Planners
Leatherology was founded in 2008 by siblings Rae and David Liu with a single traditional bifold wallet and a belief that great design and quality can be accessibly priced. Today the collection spans handbags, small leather goods, and desk essentials, including journals and planners in full grain Signature cowhide and specialty Italian and German Premium leathers. As a vertically integrated, direct-to-consumer brand, Leatherology controls its standards from material to finished piece, and its personalization program, from deboss to hand paint, keeps every journal one of a kind.
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Frequently Asked Questions
What size is an A5 journal, and will standard refills fit?
An A5 journal page measures 148 x 210 mm, or about 5.8 x 8.3 inches. Standard refills fit when they match your binding system. Ring binders need A5 pages punched in the matching ring pattern, usually 6-ring. Slip-in covers need a bound A5 notebook. Confirm the system before you buy a size A5 journal refill.
What is the most common journal size?
A5 is the most widely supported journal size. A5 notebook dimensions are 148 x 210 mm, which is 14.8 x 21 cm, or about 5.8 x 8.3 inches. That is large enough for full journal entries and small enough for a work bag, and covers, refills, and inserts are easiest to find in this format. That makes A5 the safest choice for a first setup.
What size is A6 in inches?
A6 measures 105 x 148 mm, which is 10.5 x 14.8 cm, or about 4.1 x 5.8 inches. It is exactly half of an A5 page, small enough for a jacket pocket or crossbody bag.
Which is bigger, A5 or B5?
B5 is bigger. An ISO B5 page measures 176 x 250 mm, or about 6.9 x 9.8 inches, compared with 148 x 210 mm for A5. That works out to about 40 percent more page area, which suits meeting notes and long-form writing at a desk.
What size is a B6 notebook?
An ISO B6 notebook measures 125 x 176 mm, or about 4.9 x 6.9 inches. Notebooks made to the Japanese JIS standard run slightly larger at 128 x 182 mm. B6 sits between A6 and A5, which makes it a popular compact size for daily journaling on the go.
What paper weight should I look for if I write with fountain pens?
Start at 80 GSM and aim for 90 to 100 GSM. Weight helps, but coating matters just as much, so look for paper labeled fountain pen friendly.
Lined, dot grid, or blank: how do I choose?
Choose lined if you mostly write prose. Choose dot grid for a mix of writing, lists, and layouts. Choose blank for sketching or freeform planning. A ring binder lets you combine all three in one journal.
Can I keep the same cover when the notebook runs out?
Yes. That is the purpose of a refillable leather journal. Replace the paper, keep the cover, and the leather continues to develop character with each refill.
Should I order spare refills with a new leather journal?
Whether paper comes installed varies by product, so check the listing before you order. Either way, adding one spare refill in your exact size and binding means you are never stuck when the last page fills.
How thick should a journal be to fit its cover?
Thickness depends on page count and paper weight, so two notebooks of the same size can differ noticeably. A cover fits only when it allows for both the page size and the closed thickness of the notebook. If a notebook feels too thick or too wide for its cover, check the binding first, since rings and spirals add width, then compare the closed measurements with the cover's interior.
How many inserts can one cover hold?
It depends on the system. Ring binders are limited by ring capacity. Elastic band covers are limited by the number of bands and the thickness of each booklet. Slip-in covers typically hold one notebook. Whichever system you use, stop adding pages before the cover strains to close.
Addressing Common Objections
"A refillable system sounds fussy." Once your format is set, a refill takes seconds. You choose the system once, not every time.
"A leather cover costs more than a notebook." A cover kept for years spreads its cost across every notebook it holds, and it improves with use where disposable covers wear out.
"Rings get in the way when I write." Write on right-hand pages, or lift a page out of the rings to write on it flat, then clip it back in.
Limitations to Consider
- If you want each year preserved as a single sealed volume, a bound journal in a slip-in cover may suit you better than loose rings.
- Alcohol-based markers bleed through most notebook paper regardless of weight, so heavy art journaling may call for dedicated mixed-media paper.
- If you journal digitally, a physical system may not earn its place in your bag.
What Customers Are Saying
"I bought this journal as a gift. It's a high-quality journal and I'm proud to give it to my sister-in-law. Her initials in gold look lovely. Thanks for the exquisite craftsmanship."
Final Thoughts
A journal that lasts is assembled, not bought in one piece. Settle on your journal size, invest in a cover worth keeping, choose paper that respects your pen, and pick a binding that fits how you write. The pages will turn over. The leather stays and keeps the record.
