Japanese paper sizes: Complete guide to dimensions & common uses

Japanese paper sizes are more than just numbers on a sheet, they reflect centuries of craftsmanship, precision, and practicality in Japanese stationery and printing. Whether you’re exploring notebooks, postcards, or artistic papers, understanding these sizes can transform how you choose and use stationery. Discover the full guide below and check out Kiichin’s curated selection of Japanese-style notebooks and stationery to experience these sizes firsthand.

1. What is the Japanese Industrial Standard?

The Japanese Industrial Standard (JIS) is Japan’s national standard system that ensures consistency and quality across products, including paper, machinery, electronics, and more. For paper, JIS defines official sizes, thicknesses, and quality standards used by publishers, manufacturers of stationery from Japan, and printers throughout Japan.

In terms of paper, JIS includes:

• JIS A series: Aligns with international ISO A sizes (A0, A1, A2… A4, A5, etc.), commonly used for office documents, notebooks, and general printing.

• JIS B series: Slightly larger than ISO B sizes at the same nominal number, often used for books, magazines, and stationery.

• Traditional formats: Older or legacy sizes like Shiroku‑ban and Kiku, still used for certain crafts, notebooks, and postcards.

By following JIS, manufacturers ensure that Japanese paper products are standardized, reliable, and compatible across various applications, making it easier to design, print, and use paper domestically and internationally.

2. The entire Japanese paper sizes chart in millimeters, centimeters, and inches

Japan uses a combination of JIS B series, traditional formats like Shirokuban and Kiku, and other popular sizes for stationery, postcards, and notebooks. All measurements are provided in mm, cm, inches, and aspect ratio where relevant.

2.1 JIS B Japanese paper dimensions

The JIS B series is the most widely used for books, magazines, and general stationery. Its aspect ratio is approximately 1:√2 (≈1.414), which allows for scaling up or down by halving or doubling a side.

2.2 Shirokuban Japanese paper size chart

Shirokuban is a traditional Japanese paper format, commonly used for notebooks, stationery, and some print work. Sizes may vary slightly by manufacturer.

Best for: Vintage-style notebooks, specialty stationery, calligraphy papers.

2.3 Kiku Japanese standard paper sizes

Kiku is another traditional format often used for small books, leaflets, or artistic papers.

Best for: Compact books, postcards, small-format print, decorative stationery.

2.4 Other popular paper sized in Japan

Japan also has hybrid or specialized sizes, which are commonly used for postcards, small flyers, envelopes, and hobby crafts.

Quick tip: Hagaki paper size is particularly important for Japanese postcards and greeting cards. It fits standard postal requirements in Japan.

3. Paper sizes in Japan for commonly printed items

When it comes to everyday printed materials, different Japanese paper sizes are chosen to suit specific uses. From the compact B6 formats commonly used in a Japanese notebook perfect for journaling to larger B4 sheets used in magazines and catalogs, the right size can make a big difference in practicality and aesthetics.

The table below highlights the most common paper sizes in Japan for various printed items, helping you understand how each format is applied in real-world contexts.

FAQs - People also ask about Japanese paper sizes

After exploring the various Japanese paper sizes and their common uses, you might still have some questions about how they compare to international formats or why certain sizes are preferred. The following FAQs address the most frequently asked questions to help you better understand Japanese paper sizes and their practical applications.

What is the standard paper size in Japan?

Japan commonly uses the JIS A series (aligned with ISO A sizes like A4, A5) for office and school documents. However, JIS B series (B5, B6) is often preferred for books, magazines, and products from leading Japanese notebook brands. There isn’t a single standard; the choice depends on the type of printed material.

Is JIS B5 the same as A5?

No. JIS B5 measures 182 × 257 mm (~7.2 × 10.1 in), while A5 is 148 × 210 mm (~5.8 × 8.3 in). B5 is larger and has a different aspect ratio, making it suitable for books, magazines, and notebooks rather than small-scale prints or personal planners.

Why is Japanese paper different?

Japanese paper follows the JIS (Japanese Industrial Standards), which defines B series, A series, and traditional sizes like Shirokuban and Kiku. These sizes evolved for practical printing, publishing, stationery, and cultural needs, making Japanese paper distinct from American or international formats in dimensions, aspect ratios, and typical uses.

Japanese paper sizes offer a perfect balance of practicality, elegance, and cultural heritage. From compact B6 notebooks ideal for journaling to Hagaki postcards suited for personal messages, these sizes provide versatility for everyday use, creative projects, and professional printing. Understanding JIS standards and traditional formats helps you select the right paper for any purpose, whether for books, stationery, or design work.