Area: 1 B5 = 2 × B6 (B5 is double the area). Scaling factor: √2 ≈ 1.4142 per side.
B-series is widely used for books, notebooks, and professional printing — this tool helps you scale between B6 and B5 for design and production.
B5 = B6 × 0.5 · Scale factor = √2 ≈ 1.4142 per side2 B6 sheets combine to make 1 B5 sheet (or 1 B5 = 2 B6).
📏 What is B6 Paper Size?
B6 is a medium-small paper size in the ISO 216 B-series. Its dimensions are 125 × 176 mm (4.9 × 6.9 inches), with an area of 0.022 m². B6 is widely used for pocket books, small notebooks, and compact publications. It's also popular for passports, small diaries, and pocket-sized reference materials. B6 is exactly half the area of B5, making it a common choice for portable books and notebooks.
📄 What is B5 Paper Size?
B5 is a medium paper size in the ISO 216 B-series. Its dimensions are 176 × 250 mm (6.9 × 9.8 inches), with an area of 0.044 m². B5 is the go-to size for notebooks, textbooks, and professional publications. It's also popular for diaries, planners, and small-format books. B5 is exactly double the area of B6, making it a natural step up for more detailed content.
🧮 The Math: How B6 Becomes B5
The ISO 216 B-series is based on the geometric mean between A-series sizes. Each step up (B6 → B5) doubles the area. The side lengths increase by a factor of √2 ≈ 1.4142.
- Width: 125 mm × √2 ≈ 176 mm
- Height: 176 mm × √2 ≈ 250 mm
- Area: 0.022 m² × 2 = 0.044 m²
Formula: 1 B5 = 2 × B6 (in area). So, if you have 2 B6 sheets, they can be combined to form 1 B5 sheet (or 1 B6 = 0.5 B5).
📊 Quick Conversion Table: B6 to B5
| B6 Sheets | B5 Equivalent | Scale factor (side) | Real‑world use |
|---|---|---|---|
| 0.5 B6 | 0.25 B5 | 100% | Small pocket page |
| 1 B6 | 0.5 B5 | 141.4% (enlarge) | Single pocket book page |
| 2 B6 | 1 B5 | 200% (double width/height) | Full notebook page |
| 4 B6 | 2 B5 | 282.8% | Book spread |
| 5 B6 | 2.5 B5 | 316.2% | Small book signature |
| 10 B6 | 5 B5 | 447.2% | Book chapter |
| 25 B6 | 12.5 B5 | 707.1% | Short book |
| 50 B6 | 25 B5 | 1000% | Large book volume |
🖨️ Real‑World Examples: B6 to B5 in Action
- 📖 Book Publishing: B6 is used for pocket books and small-format publications. When you need to scale up to B5 for larger editions, this converter tells you exactly how many B6 pages fit into a B5 layout.
- 📓 Notebooks & Diaries: B6 is the classic pocket notebook size. B5 is used for larger journals and planners. Understanding the scaling helps with page layout and printing.
- 🖨️ Professional Printing: B6 is used for small catalogs and reference materials. B5 offers more space for detailed content. Convert between them for consistent branding.
- 🎨 Art & Photography: B6 prints are popular for small art pieces and postcards. B5 offers a larger format for exhibition catalogs and portfolios.
- 📋 Stationery: B6 is used for small stationery sets and compact publications. B5 is used for letterheads and larger correspondence.
💡 Professional Tips for B6 to B5 Scaling
🎯 Resolution & Quality
When scaling from B6 to B5, if your original is 300 DPI, the resulting B5 will be ~212 DPI — still acceptable for most printing. For high-quality prints, design at 600 DPI at B6 to get ~424 DPI at B5.
📐 B‑Series vs. A‑Series
B-series sizes are larger than A-series sizes at the same number. For example, B5 (176 × 250 mm) is larger than A5 (148 × 210 mm). B-series is often preferred for books because it's closer to traditional book sizes.
💰 Printing Efficiency
Printing 2 B6 pages from 1 B5 sheet can save paper and costs. Many professional printers support B-series paper sizes — check your printer settings.
📂 Book Production
B6 is a common size for pocket books and small publications. When planning a book, understanding how B6 converts to B5 helps with production planning and page layout.
❓ Frequently Asked Questions (B6 to B5)
Q: How many B6 sheets equal 1 B5?
A: Exactly 2 B6 sheets make 1 B5 in terms of area. You can fit two B6 pages on one B5 sheet.
Q: What is the scaling factor from B6 to B5?
A: Each side is scaled by √2 ≈ 1.4142, meaning you enlarge the width and height by 41.4%.
Q: Can I fit a B6 document onto a B5 sheet?
A: Yes, by scaling it up to 141.4% on each dimension. The document will fit, with more white space around it.
Q: What is the difference in area between B6 and B5?
A: B5 has exactly double the area of B6 (0.044 m² vs. 0.022 m²).
Q: Is B6 bigger than B5?
A: No, B5 is larger. B5 is the next size up from B6. 1 B5 = 2 × B6.
Q: What is B6 used for?
A: B6 is used for pocket books, small notebooks, passports, and compact publications.
Q: What is B5 used for?
A: B5 is used for notebooks, textbooks, diaries, planners, and professional publications.
Q: How does B‑series compare to A‑series?
A: B-series sizes are about 1.2× larger than A-series at the same number. For example, B6 is between A6 and A5 in size.
📈 Why Accurate B6‑to‑B5 Conversion Matters
Accurate scaling between B6 and B5 is essential for book production, notebook design, and professional printing. Whether you're preparing a pocket book, designing a notebook, or planning a publication, this tool ensures your documents fit perfectly every time. Inaccurate scaling can lead to wasted paper, misaligned designs, and costly reprints.
🌐 Global Standards & Professional Usage
The B‑series (ISO 216) is used alongside the A‑series in many countries. B-series sizes are particularly popular in book publishing, notebook production, and professional design. This tool supports professional paper size conversions for users worldwide.
📐 The Full B‑Series Hierarchy
- B8 = 62 × 88 mm – small notepads, tags
- B7 = 88 × 125 mm – pocket notebooks, passports
- B6 = 125 × 176 mm – small books, notepads, pocket books
- B5 = 176 × 250 mm – medium books, notebooks, textbooks
- B4 = 250 × 353 mm – magazines, large books
- B3 = 353 × 500 mm – posters, book signatures
- B2 = 500 × 707 mm – large posters, book covers
- B1 = 707 × 1000 mm – large posters, banners
- B0 = 1000 × 1414 mm – display boards, billboards
Each step up doubles the area, making the system intuitive and easy to scale.
🔗 Explore More Paper & Print Tools
Check out our other converters: B5 to B4, B4 to B3, B3 to B2, A4 to A3, Letter to A4, PX to MM, and DPI Calculator. All designed to make your print and design workflows smoother.