Free Japanese Paper Sizes Converter
Convert traditional Japanese book, postcard, and business card sizes to screen pixels based on DPI
Common DPI Settings:
Paper Size
Books, magazines, notebooksDPI/PPI
Orientation
Paper Dimensions
182 × 257 mm
Physical Size
× px
Pixel Dimensions @ 300 DPI
VGA
Closest Screen Resolution
B5 (JIS) Portrait
× px
300 DPI
Japanese Paper Sizes: A Complete Guide
Japanese paper sizes combine international ISO standards with traditional Japanese formats, creating a unique system used for everything from books and manga to business cards and postcards.
The B Series (JIS B Sizes)
The JIS B series is the Japanese adaptation of the ISO 216 B series. Each size is the geometric mean of the corresponding A series sizes.
// B Series size relationships
B0: 1030 × 1456 mm
B1: 728 × 1030 mm (B0 halved)
B2: 515 × 728 mm (B1 halved)
B3: 364 × 515 mm (B2 halved)
B4: 257 × 364 mm (B3 halved)
B5: 182 × 257 mm (B4 halved)
// Aspect ratio: 1:√2 (approximately 1:1.414)
B0: 1030 × 1456 mm
B1: 728 × 1030 mm (B0 halved)
B2: 515 × 728 mm (B1 halved)
B3: 364 × 515 mm (B2 halved)
B4: 257 × 364 mm (B3 halved)
B5: 182 × 257 mm (B4 halved)
// Aspect ratio: 1:√2 (approximately 1:1.414)
Traditional Japanese Sizes
| Size Name | Dimensions (mm) | Japanese Name | Common Uses | Equivalent Western Size |
|---|---|---|---|---|
| Shiroku-ban | 127 × 188 mm | 四六判 | Books, manga, magazines | ~5" × 7.4" |
| Kiku-ban | 150 × 220 mm | 菊判 | Novels, literature | ~5.9" × 8.7" |
| AB判 | 210 × 257 mm | AB判 | Magazines, booklets | ~8.3" × 10.1" |
| Chuban | 112 × 173 mm | 中判 | Manga, paperbacks | ~4.4" × 6.8" |
| B6 Chuban | 112 × 174 mm | B6中判 | Light novels, manga | ~4.4" × 6.9" |
Postcard Sizes (Hagaki)
// Japanese postcard sizes
Hagaki (はがき): 100 × 148 mm - Standard postcard
Oufuku Hagaki (往復はがき): 148 × 200 mm - Reply postcard (folded)
Nenga Hagaki (年賀はがき): 100 × 148 mm - New Year's postcard
Yūbin Hagaki (郵便はがき): 100 × 148 mm - Postal service postcard
// Unique feature: Nenga hagaki have lottery numbers printed on them
Hagaki (はがき): 100 × 148 mm - Standard postcard
Oufuku Hagaki (往復はがき): 148 × 200 mm - Reply postcard (folded)
Nenga Hagaki (年賀はがき): 100 × 148 mm - New Year's postcard
Yūbin Hagaki (郵便はがき): 100 × 148 mm - Postal service postcard
// Unique feature: Nenga hagaki have lottery numbers printed on them
Business Card Sizes (Meishi)
// Japanese business card standards
Traditional Meishi: 55 × 91 mm (2.17" × 3.58")
Western Meishi: 50 × 90 mm (1.97" × 3.54")
Credit Card Size: 54 × 86 mm (2.13" × 3.39")
// Japanese meishi are slightly larger than Western business cards
Traditional Meishi: 55 × 91 mm (2.17" × 3.58")
Western Meishi: 50 × 90 mm (1.97" × 3.54")
Credit Card Size: 54 × 86 mm (2.13" × 3.39")
// Japanese meishi are slightly larger than Western business cards
Newspaper Sizes
| Size Name | Dimensions (mm) | Japanese Name | Description | Circulation |
|---|---|---|---|---|
| Broadsheet | 600 × 750 mm | 大判 | Major newspapers (Yomiuri, Asahi) | National papers |
| Tabloid | 280 × 406 mm | タブロイド判 | Sports newspapers, local papers | Sports/Specialty |
| Yatsugiri | 252 × 354 mm | 八ツ切り | Newspaper inserts, supplements | Supplements |
Manga and Book Sizes
// Common manga and book sizes in Japan
Tankōbon (単行本): B6 (128 × 182 mm) - Standard manga volume
Wide-ban (ワイド版): A5 (148 × 210 mm) - Larger format reprints
Bunkobon (文庫本): A6 (105 × 148 mm) - Paperback novels
Shinsho (新書): 103 × 182 mm - Non-fiction paperbacks
Jisaku-sōsho (自作物): Various - Self-published works
Tankōbon (単行本): B6 (128 × 182 mm) - Standard manga volume
Wide-ban (ワイド版): A5 (148 × 210 mm) - Larger format reprints
Bunkobon (文庫本): A6 (105 × 148 mm) - Paperback novels
Shinsho (新書): 103 × 182 mm - Non-fiction paperbacks
Jisaku-sōsho (自作物): Various - Self-published works
Conversion Formula
// Millimeters to Pixels conversion
Step 1: Convert mm to inches
Inches = Millimeters ÷ 25.4
Step 2: Convert inches to pixels
Pixels = Inches × DPI
Complete Formula:
Pixels = (Millimeters ÷ 25.4) × DPI
// Example: B5 (182×257mm) at 300 DPI
Width = (182 ÷ 25.4) × 300 = 2149.6px ≈ 2150px
Height = (257 ÷ 25.4) × 300 = 3035.4px ≈ 3035px
Step 1: Convert mm to inches
Inches = Millimeters ÷ 25.4
Step 2: Convert inches to pixels
Pixels = Inches × DPI
Complete Formula:
Pixels = (Millimeters ÷ 25.4) × DPI
// Example: B5 (182×257mm) at 300 DPI
Width = (182 ÷ 25.4) × 300 = 2149.6px ≈ 2150px
Height = (257 ÷ 25.4) × 300 = 3035.4px ≈ 3035px
Common DPI Settings and Their Uses
| DPI | Use Case | Quality Level | File Size | Recommended For |
|---|---|---|---|---|
| 72 DPI | Web display, screen graphics | Low (screen resolution) | Small | Website images, screen mockups |
| 150 DPI | Newspapers, draft printing | Medium | Medium | Newspaper ads, internal documents |
| 300 DPI | Standard printing, magazines | High | Large | Books, magazines, brochures |
| 600 DPI | High-quality printing, photos | Very High | Very Large | Photo books, fine art prints |
| 1200 DPI | Professional printing, lithography | Extreme | Huge | Museum prints, archival quality |
Cultural Significance
- Meishi (Business Cards): Exchange is a formal ritual in Japanese business culture
- Nenga Hagaki: New Year's postcards are a major tradition, with special delivery
- Tankōbon: Manga volumes follow specific size standards for collector consistency
- Shiroku-ban: Named after the traditional 4×6 sun measurement (approx. 121×182mm)
- Kiku-ban: Named after chrysanthemum (kiku) pattern paper
Design Considerations
// Important design considerations for Japanese print
1. Bleed Area: Typically 3-5mm extra on all sides for trimming
2. Safe Zone: Keep critical content 5-10mm from trim edges
3. Text Orientation: Can be vertical (tategaki) or horizontal (yokogaki)
4. Color Space: Use CMYK for print, RGB for digital
5. Resolution: 300 DPI minimum for quality print
6. File Format: PDF/X for print, PNG/JPEG for web
1. Bleed Area: Typically 3-5mm extra on all sides for trimming
2. Safe Zone: Keep critical content 5-10mm from trim edges
3. Text Orientation: Can be vertical (tategaki) or horizontal (yokogaki)
4. Color Space: Use CMYK for print, RGB for digital
5. Resolution: 300 DPI minimum for quality print
6. File Format: PDF/X for print, PNG/JPEG for web
