Notebook Size Guide: A5, A6, B5 Dimensions & Best Uses

Choosing a notebook size is less straightforward than it looks. A5, A6 and B5 are among the most searched and widely used formats, but real notebooks also appear in A4, B6, A7, Pocket, Passport, Cardbook, Slim, Traveler’s and brand-specific “Plus” sizes. Some names follow international paper standards; others do not.

This guide brings those systems together in one place. You will find dimensions in millimeters and inches, practical use cases, the difference between ISO and Japanese B sizes, and a clear explanation of why labels such as A5+ or B6+ should never be treated as universal standards.

Notebook Size Chart: A3 to Cardbook, Passport & More

Start with the standardized formats. ISO 216 defines the familiar A and B paper series; notebook covers and finished products may be a few millimeters different because of trimming, binding or manufacturer design.

Common Non-ISO and Specialty Notebook Formats

These names are useful in the stationery market, but they are not one universal paper standard. Dimensions can change by brand, so treat them as common references rather than fixed specifications.

Sizing note: A, B and JIS labels describe paper-size systems; Pocket, Passport, Cardbook, Slim, Composition and Traveler’s formats are market conventions or product systems. For a physical notebook, the manufacturer’s actual trim and cover dimensions are the final reference.

How Notebook Size Standards Actually Work

The A Series: A4, A5, A6 and Smaller

The ISO A series is the cleanest part of notebook sizing. A4 is 210 × 297 mm, A5 is 148 × 210 mm, and A6 is 105 × 148 mm. Each step down has half the area of the previous size while keeping the same proportions. That makes A-series layouts easy to resize for printing and familiar to readers around the world.

For notebooks, A4 is desk-oriented, A5 is a strong middle ground, and A6 prioritizes portability. A7 and A8 continue the same system, but their small pages are better suited to short notes than long-form writing.

The B Series: Why B5 and B6 Can Be Confusing

B5 and B6 need more care because ISO B sizes and Japanese JIS B sizes are different. ISO B5 is 176 × 250 mm, while JIS B5 is 182 × 257 mm. ISO B6 is 125 × 176 mm; JIS B6 is 128 × 182 mm. Japanese notebook makers may also trim the finished notebook slightly differently from the nominal sheet size.

That difference is small enough to be missed in a product title but large enough to matter when buying fitted covers, printing inserts or preparing artwork. If “B5” is all a listing tells you, check the millimeter dimensions before assuming compatibility.

Page Size, Cover Size and Finished Size Are Not Always the Same

A notebook sold as “A5” may refer to its paper format, its approximate body size, or simply a product category. Hard covers, coils, binding margins and trimming can change the final footprint. For custom printing, the artwork template matters more than the nickname on the product page.

The Most Common Notebook Sizes Explained

A4 Notebook Size: Maximum Space for Desk Work

Standard A4 measures 210 × 297 mm (8.27 × 11.69 in). It gives you the same familiar page area as common office printer paper, so it works well for detailed class notes, meeting records, mind maps, technical sketches and projects that need room to breathe.

A4 is best when page space matters more than portability. It fits backpacks and document bags, but it is noticeably less convenient for casual everyday carry than A5 or B5.

A5 Notebook Size: The Everyday All-Rounder

A5 measures 148 × 210 mm (5.83 × 8.27 in). It is one of the most practical notebook formats because it leaves enough space for paragraphs, weekly layouts, checklists and small sketches without turning the notebook into a desk-only object.

For journaling, planning, meeting notes and creator merchandise, A5 is often the easiest size to understand at a glance. It also works naturally with A-series artwork because an A4 design can be reduced proportionally to A5.

A6 Notebook Size: Compact Without Becoming Tiny

A6 is 105 × 148 mm (4.13 × 5.83 in). It is half the area of A5 and a much stronger choice for travel, quick ideas, to-do lists, language notes and small daily journals.

The trade-off is simple: A6 is easy to carry, but long entries and wide layouts can feel cramped. For custom merch, that compact format can still be a benefit when the product is designed as a collectible, gift or everyday-carry item.

B5 Notebook Size: More Room Than A5, Less Bulk Than A4

Under ISO 216, B5 measures 176 × 250 mm (6.93 × 9.84 in). It sits between A5 and A4, giving significantly more writing area than A5 without reaching full A4 size.

That extra width is useful for class notes, diagrams, large bullet-journal spreads, drawing and visual planning. If you buy Japanese stationery, remember that JIS B5 is larger at 182 × 257 mm, and some finished Japanese school notebooks use their own trimmed dimensions.

B6 Notebook Size: A Comfortable Compact Middle Ground

ISO B6 measures 125 × 176 mm (4.92 × 6.93 in). It is larger than A6 but smaller than A5, which makes it useful for people who want a compact journal without giving up as much writing room as A6.

B6 is also common in Japanese stationery, where JIS B6 is 128 × 182 mm. “B6 Slim” is a separate, non-standard idea: makers reduce the width while keeping a similar height, creating a narrow book that feels more like a paperback or travel journal.

Smaller and Specialty Notebook Sizes Worth Knowing

A7 and A8: Mini Notebooks for Short Notes

A7 is 74 × 105 mm and A8 is 52 × 74 mm. These are true ISO sizes, but their writing area is small. They are better for reminders, vocabulary, swatches, tiny sketches or pocket reference notes than for full journal pages.

Pocket vs. Passport Notebook Size

“Pocket” is not a single standard. A common reference is roughly 90 × 140 mm, while some brands use 90 × 150 mm. Passport notebooks are usually shorter; TRAVELER’S COMPANY, for example, uses 89 × 124 mm for its Passport Size refill. Other makers often round that to about 90 × 125 mm.

Use Passport when you want the smallest practical travel journal. Choose Pocket when you want a little more height for lists and everyday notes. In either case, check the exact dimensions before buying a fitted cover or insert.

Cardbook / Card-Size Notebook

Cardbook is a niche product name rather than an international standard. Some stationery makers use it for notebooks around 55 × 90 mm (about 2.17 × 3.54 in), close to a card-sized footprint. It is useful for tiny reminders, pocket references or novelty stationery, but there is no guarantee that two “Cardbook” products will match exactly.

A5 Slim, B6 Slim and Traveler’s Regular

Slim formats keep the height of a familiar notebook while narrowing the page. A5 Slim is often around 125 × 210 mm, while B6 Slim commonly appears around 105–110 × 175–182 mm. These are not ISO sizes, and dimensions vary across brands and planner systems.

TRAVELER’S Regular is another recognizable specialty format at 110 × 210 mm. Its tall, narrow page is especially suited to travel notes, lists, collage and modular refill systems.

US Letter, Half Letter, Legal and Composition Sizes

North American notebooks often use familiar office and school formats instead of ISO names. Letter is 8.5 × 11 inches; Half Letter is 5.5 × 8.5 inches; Legal is 8.5 × 14 inches. “Composition” is a product convention rather than a single international standard, with many classic books near 7.5 × 9.75 inches.

These sizes are useful to include in a global guide because a shopper searching for “notebook size” may be comparing ISO stationery with US school or office notebooks, not just A-series formats.

What Do A4+, A5+, A6+, B6+ and Other “Plus” Sizes Mean?

The “+” symbol is not part of ISO 216. It usually means a brand has made a format slightly larger, taller, wider or differently proportioned than the standard name suggests. The important point is that “Plus” does not add a fixed number of millimeters.

This is why an “A4+ notebook size” search cannot be answered with one universal measurement. Dingbats and LEUCHTTURM1917 both sell products called A4+, yet their dimensions differ. Treat the plus sign as a brand-specific format label, not a paper standard.

A4 vs. A5 vs. A6 vs. B5 vs. B6: Quick Comparison

 If you are deciding between the five most useful everyday formats, think of them as a sliding scale: A4 favors space, A6 favors portability, and A5 sits near the center. B5 gives you an extra step toward desk space, while B6 gives you an extra step toward portability.

Best Notebook Size for Different Uses

For Journaling and Planning

A5 is a reliable default for daily journaling, bullet-style planning and weekly layouts. B6 works well when you want a smaller personal journal, while B5 is better for decorative spreads, trackers and layouts that need more horizontal room. A6 is practical for short daily entries rather than long reflective writing.

For School, Study and Work

B5 and A4 are strongest for detailed class notes, diagrams and subjects that benefit from larger pages. A5 is easier to carry between classes or meetings and still gives enough room for structured notes. For short meeting notes or a compact work notebook, B6 or A6 can be enough.

For Drawing and Creative Projects

A4 and B5 offer the most flexible space for sketches, visual notes and mixed layouts. A5 is better when the notebook needs to travel with you. Page size is only one factor here: paper weight, surface and binding can matter just as much for markers, paint or wet media.

For Travel and Everyday Carry

A6, B6, Pocket and Passport formats are easier to keep in a small bag. Passport is the most travel-specific; A6 is more versatile; B6 gives extra writing room; Pocket varies widely enough that you should check the actual measurements. Traveler’s Regular is useful when you like a tall page and interchangeable inserts.

For Creator Merch and Custom Stationery

For creator merchandise, the best size is not automatically the biggest. A6 can feel collectible and giftable, A5 has broad everyday appeal, and B5 gives artwork more visual presence. Think about how the cover illustration will read at the final physical size, how much the product will weigh, and whether buyers are likely to carry it or keep it at a desk.

How to Choose a Notebook Size for Custom Printing

1. Start With the User, Not the Size Name

Choose the use case first. A travel notebook, class notebook, artist sketch notebook and convention merch item solve different problems. Once the use is clear, size becomes a practical decision instead of a guess.

2. Separate Page Size From Cover and Artwork Size

The page dimensions in a size chart are not automatically the dimensions of your cover artwork. Spiral binding, wraparound covers, bleed, safe zones and rounded corners can all change the production file. Never build print artwork from a generic “A5 = 148 × 210 mm” assumption alone.

3. Check the Exact Product Template Before You Design

For Vograce, the current Custom Spiral Notebooks list A6 at 105 × 148 mm, A5 at 148 × 210 mm and B5 at 176 × 250 mm. That B5 is the ISO B5 format, not the larger JIS B5. Other notebook constructions can use different inner-page or cover dimensions, so the product template should always be your production source of truth.

If you are comparing notebook types first, browse Vograce custom notebooks and then check the size, page style and template on the specific product page before preparing final artwork.

4. Balance Portability, Page Count and Shipping Weight

A larger page gives more room, but notebook thickness and binding also affect the final product. A compact A6 with many pages can still feel substantial; a thin B5 can remain easy to handle. For merch, consider the whole object rather than treating page dimensions as the only sizing decision.

Final Takeaway

A good notebook size guide should do more than list measurements. The useful distinction is between standard sizes such as A4, A5, A6 and ISO B5/B6, and market or brand formats such as Pocket, Passport, Cardbook, Slim and “Plus” sizes. Once you know which system you are looking at, comparing notebooks becomes much easier.

For most people, A5 is the balanced everyday choice, A6 is the portable option, B5 is the roomy creative or study format, B6 sits comfortably between A6 and A5, and A4 is best when maximum page space matters. For custom printing, always finish the decision with the manufacturer’s exact dimensions and artwork template.

Notebook Size FAQs

What is the most common notebook size?

There is no single global notebook standard, but A5 is one of the most common all-purpose formats because it balances writing space and portability.

What size is an A5 notebook?

Standard ISO A5 is 148 × 210 mm, or about 5.83 × 8.27 inches. Finished covers may differ slightly.

Is B5 bigger than A5?

Yes. ISO B5 is 176 × 250 mm, while A5 is 148 × 210 mm. Japanese JIS B5 is larger again at 182 × 257 mm.

Is B6 bigger than A6?

Yes. ISO B6 is 125 × 176 mm compared with A6 at 105 × 148 mm, so B6 provides more writing area while remaining compact.

Are all B5 notebooks the same size?

No. ISO B5 is 176 × 250 mm and JIS B5 is 182 × 257 mm, and individual notebook makers may trim their finished products differently.

What is the difference between A5 and A5+?

A5 is a standardized ISO size. A5+ is a brand-defined size that is usually somewhat larger, but there is no universal A5+ measurement.

What size is a Passport notebook?

Passport is not an ISO size. A common reference is about 89–90 × 124–125 mm; TRAVELER’S COMPANY uses 89 × 124 mm for its Passport Size refill.

What size is a Cardbook notebook?

Cardbook is not standardized. Some makers use roughly 55 × 90 mm, but you should check the exact brand dimensions before buying accessories or preparing inserts.

What notebook size is best for journaling?

A5 is the most versatile starting point. B6 suits a more compact journal, while B5 gives extra room for decorative or visual layouts.

What notebook size is best for custom merch?

A5 is broadly versatile, A6 is compact and collectible, and B5 gives artwork more presence. Choose based on how buyers will use and carry the notebook, then design from the exact production template.