The Kokuyo Campus notebook is the most popular notebook in Japan — and once you try one, you’ll understand why. After decades of refinement, Kokuyo has created a notebook that does everything well: the paper handles every writing instrument without bleeding, the binding lies flat, the ruling options cover every use case, and the price-to-quality ratio is unmatched.
But the Campus line is extensive. There are multiple sizes, ruling styles, paper weights, and specialty variants. This guide walks through every option so you can find the perfect Campus notebook for your needs. For a detailed review of the standard Campus notebook, see our Kokuyo Campus review.
Paper Quality: What Makes Campus Paper Special
All Campus notebooks use Kokuyo’s proprietary paper blend, which is engineered for the Japanese market where gel pens, fountain pens, and mechanical pencils are daily tools. The paper characteristics:
- Weight: Approximately 70-75 gsm (standard line) — lightweight but opaque
- Surface: Smooth with micro-texture for pen grip
- Ink handling: Minimal bleeding with gel pens, no feathering with fine fountain pen nibs
- Pencil performance: Adequate tooth for graphite grip, clean erasability
- Show-through: Minimal with standard pens; slight with heavy fountain pen inks
- Color: Clean white (not cream)
The paper is not Tomoe River (used in Hobonichi planners) — it’s thicker, more opaque, and more suitable for everyday notebook use. For pure fountain pen performance, Tomoe River is superior. For everything else, Campus paper is the better all-rounder.
Sizes
B5 (6.9 x 9.8 inches / 179 x 252mm) — The Standard
B5 is the standard Japanese student and office notebook size. It’s large enough for detailed notes and diagrams, portable enough for daily carry, and fits in most bags. If you’re buying your first Campus notebook, start with B5.
This is the size used by Japanese students from middle school through university. It’s the size we use for language study notes, meeting notes, and general daily writing.
A5 (5.5 x 8.3 inches / 148 x 210mm) — The Portable Option
A5 is the same width as an A4 sheet folded in half. It’s significantly more portable than B5 and fits in smaller bags, jacket pockets, and planner covers. The trade-off is less writing space per page.
A5 works well for bullet journals, daily planners, personal journals, and situations where you need a notebook but don’t want to carry a full B5.
A4 (8.3 x 11.7 inches / 210 x 297mm) — The Full-Size
A4 is standard for printed documents in Japan (like US Letter in the United States). Campus A4 notebooks are used for detailed notes that need maximum space — project planning, sketching, technical documentation, and long-form writing.
Semi-B5 / B6
Kokuyo also offers smaller variants including semi-B5 (slightly smaller than standard B5) and B6 for pocket notebooks. These are less common but available for specific portable needs.
Ruling Styles
Dotted Lines (ドット入り罫線) — Our Top Recommendation
Available spacings: 6mm (A ruling), 7mm (B ruling)
The dotted line ruling is Kokuyo’s innovation that has become our standard recommendation for almost every use case. Instead of solid horizontal lines, the pages feature rows of evenly spaced dots. These dots guide your writing with the same precision as solid lines but are visually lighter, creating cleaner-looking pages.
The dots also serve as vertical guides — connect them vertically for tables, columns, or margins. This hidden grid functionality makes dotted Campus notebooks remarkably versatile for text, tables, lists, and diagrams without the visual clutter of grid paper.
Best for: Note-taking, study notes, bullet journaling, general writing, lists
Standard Ruled (罫線)
Available spacings: 6mm (A ruling), 7mm (B ruling), 8mm (C ruling)
Traditional horizontal lines with no vertical guides. Clean and simple. The 6mm spacing (A ruling) is standard for adult writing; the 7mm (B ruling) provides slightly more space; the 8mm (C ruling) is used in elementary education.
Best for: Extended writing, journaling, people who prefer traditional ruled paper
Grid (方眼)
Available spacings: 5mm
Grid paper with 5mm squares. Essential for technical drawing, graphing, math, engineering notes, and any content that benefits from both horizontal and vertical alignment. The 5mm size is small enough for detailed work but large enough for comfortable handwriting.
Best for: Math and science notes, technical drawing, architecture, diagram-heavy work
Blank (無地)
No lines, no dots, no grids. Pure white paper for freeform writing, sketching, mind mapping, and creative work. The Campus paper quality makes blank pages suitable for both pen and pencil work.
Best for: Sketching, mind mapping, freeform creative work, pasting-in clippings
Kanji Practice (漢字練習)
Specialized grid paper for kanji practice with cross-guide squares. Available in 8mm, 10mm, 12mm, and 15mm grid sizes. Each square has faint cross lines dividing it into quadrants for character proportion guidance.
Best for: Japanese language learning, kanji writing practice, character proportion development
Specialty Campus Lines
Campus Smart Ring (Binder)
Price: ~$8-12
A slim binder system that uses specially designed Campus loose-leaf paper. The Smart Ring mechanism holds up to 60 sheets and maintains the flat-lying property of bound notebooks. Add, remove, and reorganize pages freely.
This is the best option for language learners who want to reorganize notes by topic, students who take notes across multiple subjects in one binder, and anyone who wants the flexibility of loose-leaf with the portability of a notebook.
Campus Soft Ring
Price: ~$5
Uses a soft, flexible ring binding that doesn’t dig into your hand when writing on the left page. This solves the most common complaint about ring-bound notebooks — the rings pressing into your wrist. The soft material compresses under hand pressure, providing a nearly flat writing surface.
Campus High-Grade Paper
Price: ~$6-8
A premium variant with heavier, smoother paper (approximately 80-85 gsm) designed specifically for fountain pen use. The paper handles wetter inks with less show-through and provides a smoother writing surface for nibs. If you use fountain pens daily, this is the Campus variant to buy.
Excellent with Pilot Iroshizuku inks and fine Japanese fountain pen nibs.
Campus Todai Series
Price: ~$4-5
Developed in collaboration with University of Tokyo students, this variant features wider margins, dedicated space for date and subject labeling, and dot-ruling optimized for academic note-taking. The layout encourages organized, structured notes.
Choosing Your Campus Notebook
For Students
- Size: B5
- Ruling: Dotted B (7mm)
- Why: Standard Japanese student size, dotted ruling is most versatile for notes, diagrams, and lists
For Professionals
- Size: A5 (meetings, portable) or B5 (desk)
- Ruling: Dotted A (6mm)
- Why: Tighter line spacing fits more content per page; A5 is discreet in meetings
For Japanese Language Learners
- Study notes: B5, Dotted B (7mm) — for grammar and vocabulary
- Kanji practice: B5, Kanji Grid 12mm — for character writing
- See our complete language study stationery guide
For Bullet Journaling
- Size: A5
- Ruling: Dotted A (6mm) or Grid (5mm)
- Why: A5 is the standard bullet journal size; dots/grid support both text and layout design
For Fountain Pen Users
- Size: Your preference
- Paper: Campus High-Grade
- Why: Heavier paper handles wet inks better; smoother surface for nib glide
- For comparisons with other fountain pen papers: see our Leuchtturm vs. Kokuyo article
Campus vs. Competitors
Campus vs. Midori MD
Midori MD offers cream-colored paper, thread-bound construction, and a more premium aesthetic. Campus offers whiter paper, more ruling options, and lower prices. Midori MD wins on aesthetics and fountain pen performance. Campus wins on versatility and value. See our full comparison.
Campus vs. Leuchtturm 1917
Leuchtturm offers numbered pages, index pages, and a built-in bookmark — features that bullet journalists love. Campus offers better paper quality (less ghosting, less bleeding) at a lower price. Leuchtturm is better as a self-contained journal system. Campus is better as a pure notebook.
Campus vs. Maruman Mnemosyne
Maruman Mnemosyne uses heavier paper (80 gsm) with a smoother surface, and the perforated pages tear out cleanly for sharing or filing. Campus is cheaper, more widely available, and offers more ruling options. Mnemosyne is the choice for professionals who tear out and share pages regularly.
Frequently Asked Questions
What’s the difference between A ruling and B ruling?
A ruling is 6mm line spacing — tighter lines that fit more text per page. B ruling is 7mm — slightly wider lines that are more comfortable for larger handwriting. In Japan, A ruling is standard for high school and above; B ruling is standard for elementary and middle school. Most adults prefer A ruling.
Do Campus notebooks work with fountain pens?
Standard Campus notebooks work well with fine Japanese fountain pen nibs and well-behaved inks. For wetter pens, broader nibs, or saturated inks (like some Pilot Iroshizuku colors), the High-Grade Campus variant provides better performance with less show-through.
How many pages are in a Campus notebook?
Standard Campus notebooks contain 30 or 40 sheets (60 or 80 pages). Some variants offer 50 or 80 sheets. The 40-sheet version is most common.
Where can I buy Campus notebooks in the US?
Amazon carries the most popular variants. JetPens offers the widest selection, including specialty variants not commonly available on Amazon. Some Asian stationery stores and Daiso locations also stock Campus notebooks. For more options, see our guide on where to buy Japanese stationery.
Are Kokuyo Campus notebooks eco-friendly?
Kokuyo uses FSC-certified paper in many Campus products and has committed to increasing the percentage of recycled materials. The thin, efficient paper uses less raw material per page than many competitors. The notebook covers are made from recycled materials in several lines.