When preparing documents for print, mailing invoices, picking photo frames, or shopping for business card holders, you often need to check exact dimensions: "What are the millimeter measurements of A4 paper?", "Will this card fit in my wallet?", or "What is the maximum thickness for post office letter mail?"
This reference guide details standard international and Japanese dimensions (A-series, JIS B-series, business cards, photo prints, envelopes) and explains how to project these standard sizes directly onto Jougi Online's screen ruler to verify physical fit instantly.
1. Comprehensive Standard Dimensions Reference Table
① Paper Standards (A-Series & JIS B-Series)
| Standard | Width × Height (mm) | Centimeters (cm) | Inches (in) | Common Applications |
|---|---|---|---|---|
| A3 Paper | 297.0 × 420.0 mm | 29.7 × 42.0 cm | 11.69 × 16.54 in | Architectural drawings, posters, brochures |
| A4 Paper | 210.0 × 297.0 mm | 21.0 × 29.7 cm | 8.27 × 11.69 in | Worldwide office paper, reports, official documents |
| A5 Paper | 148.0 × 210.0 mm | 14.8 × 21.0 cm | 5.83 × 8.27 in | Notebooks, manuals, invoices |
| JIS B4 Paper | 257.0 × 364.0 mm | 25.7 × 36.4 cm | 10.12 × 14.33 in | Flyers, drafting sheets, awards |
| JIS B5 Paper | 182.0 × 257.0 mm | 18.2 × 25.7 cm | 7.17 × 10.12 in | Japanese school notebooks, textbooks, magazines |
② Cards, Identification & Photo Prints
| Standard | Width × Height (mm) | Centimeters (cm) | Inches (in) | Details |
|---|---|---|---|---|
| Japanese Business Card (No. 4) | 91.0 × 55.0 mm | 9.1 × 5.5 cm | 3.58 × 2.17 in | Standard Japanese business card (Tokyo No. 4) |
| US Business Card | 89.0 × 51.0 mm | 8.9 × 5.1 cm | 3.50 × 2.00 in | North American standard business cards |
| ISO Credit Card (ID-1) | 85.60 × 53.98 mm | 8.56 × 5.40 cm | 3.37 × 2.13 in | Driver's licenses, bank cards, IC transit cards |
| Postal Postcard | 100.0 × 148.0 mm | 10.0 × 14.8 cm | 3.94 × 5.83 in | Official postcard format |
| Photo L-Size | 89.0 × 127.0 mm | 8.9 × 12.7 cm | 3.50 × 5.00 in | Most common photographic print size in Japan |
| Photo 2L-Size | 127.0 × 178.0 mm | 12.7 × 17.8 cm | 5.00 × 7.01 in | Group portraits and large framed prints |
2. A-Series vs JIS B-Series Paper: The Historical Distinction
- A-Series (ISO 216 International Standard): Designed around a constant aspect ratio of 1 : √2 (the Silver Ratio, roughly 1 : 1.414). When cut in half, the resulting halves retain the exact same proportions without waste.
- B-Series (Japanese JIS Standard): Rooted in traditional Edo-period Mino paper (美濃紙). Japanese JIS B-series is roughly 1.22 times larger than ISO B-series, and remains widely used in school notebooks, manga anthologies, and governmental publications in Japan.
3. Projecting Standard Dimensions on Jougi Online
On Jougi Online's homepage table, clicking "Project to Ruler" (定規に投影) automatically positions the screen caliper pins to that exact millimeter dimension (e.g. 91.0 mm for a business card or 30.0 mm for postal parcel thickness).
Overlaying an object between the pins allows you to verify physical fit instantly without digging out a plastic ruler or tape measure.