Formula: Width px = 250 × (DPI ÷ 25.4) • Height px = 353 × (DPI ÷ 25.4)
Note: B4 is commonly used in Japan and other Asian countries for books and magazines.
B4 Paper Size in Pixels — Complete Guide to Dimensions and Resolution
Understanding the exact pixel dimensions of B4 paper is essential for designers, printers, and professionals working with international paper formats. B4 is a versatile size, particularly popular in Japan and other Asian countries for books, magazines, and professional printing. This comprehensive guide covers everything you need to know about B4 size in pixels.
📐 What is B4 Paper Size?
B4 is a standard paper size defined by the ISO 216 international standard for B-series paper. It measures 250 × 353 mm (9.84 × 13.90 inches). B4 is commonly used for:
- Books and magazines — Particularly popular in Japan and Asian publishing
- Professional printing — Used for catalogs, brochures, and reports
- Architectural drawings — Detailed plans and technical documents
- Musical scores — Sheet music and orchestral parts
- Envelopes — B4 is a common size for envelopes in many countries
The B4 size is part of the B-series paper sizes, where each size is half the previous one. B4 is half of B3 and twice the size of B5. The B-series was designed to provide sizes between A-series sizes.
📊 B4 vs A4 Comparison
B4 vs A4: B4 (250 × 353 mm) is larger than A4 (210 × 297 mm). B4 is approximately 1.19 times larger in each dimension, making it ideal for applications that require a slightly larger format than A4.
Key difference: B4 is commonly used in Japan for books and magazines, while A4 is more common in Europe and the US for standard documents.
📊 B4 Size in Pixels at Common Resolutions
The pixel dimensions of B4 depend entirely on the resolution (DPI/PPI). Here's a quick reference for common DPI values:
| Resolution (DPI) | Width (px) | Height (px) | Total Pixels | Use Case |
|---|---|---|---|---|
| 72 DPI | 709 | 1,001 | 0.71 MP | Web display / Screen |
| 96 DPI | 945 | 1,334 | 1.26 MP | Standard screen |
| 150 DPI | 1,476 | 2,083 | 3.08 MP | Low-quality print |
| 200 DPI | 1,969 | 2,780 | 5.47 MP | Basic print quality |
| 250 DPI | 2,461 | 3,475 | 8.55 MP | Good print quality |
| 300 DPI | 2,953 | 4,169 | 12.31 MP | Professional print |
| 350 DPI | 3,445 | 4,864 | 16.76 MP | High-quality print |
| 400 DPI | 3,937 | 5,559 | 21.89 MP | Premium print |
| 600 DPI | 5,906 | 8,339 | 49.24 MP | Professional photography |
| 1200 DPI | 11,811 | 16,677 | 196.99 MP | High-resolution scanning |
🧮 How to Calculate B4 Size in Pixels
The formula to convert B4 paper size (250 × 353 mm) to pixels is simple:
🔢 Conversion Formula
Width in pixels: Width (px) = 250 × (DPI ÷ 25.4)
Height in pixels: Height (px) = 353 × (DPI ÷ 25.4)
Total pixels (megapixels): MP = (Width × Height) ÷ 1,000,000
Example: At 300 DPI: Width = 250 × (300 ÷ 25.4) = 2,953 px | Height = 353 × (300 ÷ 25.4) = 4,169 px
The constant 25.4 is the number of millimeters in one inch, which converts mm to inches before multiplying by the DPI value.
📄 B4 vs Other Common Paper Sizes
Understanding how B4 compares to other paper sizes helps you choose the right format for your project:
📊 B-Series Sizes
B0: 1000 × 1414 mm (39.4 × 55.7 in)
B1: 707 × 1000 mm (27.8 × 39.4 in)
B2: 500 × 707 mm (19.7 × 27.8 in)
B3: 353 × 500 mm (13.9 × 19.7 in)
B4: 250 × 353 mm (9.8 × 13.9 in)
B5: 176 × 250 mm (6.9 × 9.8 in)
B6: 125 × 176 mm (4.9 × 6.9 in)
📊 Common International Sizes
A4: 210 × 297 mm (8.3 × 11.7 in)
B4: 250 × 353 mm (9.8 × 13.9 in)
A3: 297 × 420 mm (11.7 × 16.5 in)
B5: 176 × 250 mm (6.9 × 9.8 in)
Letter: 216 × 279 mm (8.5 × 11 in)
Legal: 216 × 356 mm (8.5 × 14 in)
🖨️ B4 Size for Printing — Resolution Recommendations
Choosing the right resolution for printing B4 depends on the application and quality requirements:
Books & Magazines (Viewing Distance: 0.3-0.5m)
Recommended: 250-300 DPI
At 250 DPI: 2,461 × 3,475 px
At 300 DPI: 2,953 × 4,169 px
Perfect for professional publishing and high-quality printing.
Brochures & Catalogs (Viewing Distance: 0.3-0.6m)
Recommended: 200-300 DPI
At 200 DPI: 1,969 × 2,780 px
At 300 DPI: 2,953 × 4,169 px
Ideal for marketing materials and product catalogs.
Digital Display / Web
Recommended: 72-96 DPI
At 72 DPI: 709 × 1,001 px
At 96 DPI: 945 × 1,334 px
Suitable for digital presentations and web use.
High-Resolution Scanning
Recommended: 600-1200 DPI
At 600 DPI: 5,906 × 8,339 px
At 1200 DPI: 11,811 × 16,677 px
Used for archival scanning and detailed reproduction.
📊 B4 Size in Different Units
🔄 How to Use This B4 Pixel Size Tool
- Enter the resolution in DPI (dots per inch) or PPI (pixels per inch) in the input field.
- Click "Calculate" or press Enter to get instant pixel dimensions.
- View all results: The tool shows width, height, total megapixels, and the paper size.
- Use the reference table for quick lookups at common resolutions.
- Share our tool with fellow designers, printers, or anyone working with B4 paper size.
❓ Frequently Asked Questions
A: At 300 DPI, B4 measures 2,953 × 4,169 pixels (12.3 megapixels). This is the standard resolution for professional quality printing.
A: For web and screen use (72 DPI), B4 measures 709 × 1,001 pixels. At 96 DPI, it's 945 × 1,334 pixels.
A: For professional print quality, use 300 DPI (2,953 × 4,169 px). For books and magazines, 250-300 DPI is recommended.
A: Yes, B4 (250 × 353 mm) is larger than A4 (210 × 297 mm). B4 is approximately 1.19 times larger in each dimension.
A: B4 has an aspect ratio of 1:√2 (approximately 1:1.414). This is the standard aspect ratio for all B-series paper sizes.
A: B4 at 300 DPI is 2,953 × 4,169 = 12,311,057 pixels, or approximately 12.3 megapixels.
A: B4 paper size is 250 × 353 millimeters, or 25.0 × 35.3 centimeters.
A: Yes, B4 is commonly used in Japan and other Asian countries for books, magazines, and professional publications.
📈 Common Misconceptions About B4 Paper Size
- Misconception: "B4 has a fixed pixel size" — Fact: Pixel size depends entirely on DPI/PPI. B4 is always 250 × 353 mm, but pixel dimensions vary with resolution.
- Misconception: "B4 is the same as B4 envelope" — Fact: B4 paper and B4 envelopes have the same dimensions, but envelopes may have different flap configurations.
- Misconception: "B4 is just larger A4" — Fact: B4 is larger than A4, but it's a different series with different mathematical origins.
- Misconception: "Higher DPI always means better quality" — Fact: While higher DPI provides more detail, the optimal DPI depends on viewing distance and print requirements.
📡 Pro Design Tip: B4 Print Preparation
When preparing files for B4 printing, follow these professional guidelines:
- Resolution: 300 DPI for high-quality prints (2,953 × 4,169 px)
- Bleed: Add 3-5 mm bleed around all edges
- Color Mode: CMYK for print, RGB for digital display
- File Format: PDF/X-1a or TIFF for best print quality
- Sharpening: Apply moderate sharpening for print output
- Total File Size: At 300 DPI, file sizes are typically under 10 MB (uncompressed TIFF)
📊 Understanding B-Series Paper Sizes
The B-series paper sizes are designed to provide intermediate sizes between A-series sizes:
- Origins: The B-series was developed to complement the A-series, providing sizes that are geometric means between A sizes.
- Mathematical basis: Each B size is the geometric mean of the adjacent A sizes. For example, B4 is the geometric mean of A4 and A3.
- Usage: B-series is commonly used for posters, books, and envelopes that need sizes between A sizes.
- International standard: ISO 216 defines both A and B series, with B4 being a popular size in many countries.
- Regional popularity: B4 is particularly popular in Japan, China, and other Asian countries for publishing.
🔄 Common B4 Size Use Cases
- 📚 Books: B4 is commonly used for coffee table books, art books, and professional publications.
- 📰 Magazines: B4 is a popular size for high-end magazines and journals.
- 📋 Catalogs: B4 is ideal for product catalogs and marketing materials.
- 🎵 Sheet Music: B4 is commonly used for musical scores and orchestral parts.
- 📐 Technical Drawings: B4 is used for detailed plans and technical documents.
- 📩 Envelopes: B4 envelopes are common for mailing large documents.
📈 Future of Paper Sizes and Digital Formats
While digital formats continue to evolve, paper sizes like B4 remain relevant:
- Digital Publishing: B4 remains a standard for professional publishing workflows
- Sustainable Printing: B4 is efficient for minimizing paper waste in the B-series system
- Custom Printing: B4 continues to be a versatile size for personalized products
- Augmented Reality: B4 printed markers are used in AR applications for tracking
- Interactive Displays: B4-sized digital displays are becoming more common
🎓 Educational Resources and Further Reading
- Explore our complete suite of paper size converters
- B3 Size in Pixels
- B5 Size in Pixels
- Paper Size Converter
- DPI Calculator
- Read our blog for more design and printing tips
Last updated: January 2026. Our B4 size in pixels tool is regularly reviewed for accuracy and performance.