Area: 1 B2 = 2 × B3 (B2 is double the area). Scaling factor: √2 ≈ 1.4142 per side.
B-series is used for posters, books, and large-format printing — this tool helps you scale between B3 and B2 for professional design and production.
B2 = B3 × 0.5 · Scale factor = √2 ≈ 1.4142 per side2 B3 sheets combine to make 1 B2 sheet (or 1 B2 = 2 B3).
📏 What is B3 Paper Size?
B3 is a medium-large paper size in the ISO 216 B-series. Its dimensions are 353 × 500 mm (13.9 × 19.7 inches), with an area of 0.1765 m². B3 is widely used for posters, books, and professional printing. It sits between A3 (297 × 420 mm) and A2 (420 × 594 mm) in size, offering a versatile format for design and publishing. B3 is exactly half the area of B2, making it a common choice for book signatures and medium-format posters.
📄 What is B2 Paper Size?
B2 is a large paper size in the ISO 216 B-series. Its dimensions are 500 × 707 mm (19.7 × 27.8 inches), with an area of 0.3535 m². B2 is the go-to size for large posters, book covers, and professional printing projects. It's also popular for architectural presentations and large-format marketing materials. B2 is exactly double the area of B3, making it a natural step up for more impactful designs.
🧮 The Math: How B3 Becomes B2
The ISO 216 B-series is based on the geometric mean between A-series sizes. Each step up (B3 → B2) doubles the area. The side lengths increase by a factor of √2 ≈ 1.4142.
- Width: 353 mm × √2 ≈ 500 mm
- Height: 500 mm × √2 ≈ 707 mm
- Area: 0.1765 m² × 2 = 0.3535 m²
Formula: 1 B2 = 2 × B3 (in area). So, if you have 2 B3 sheets, they can be combined to form 1 B2 sheet (or 1 B3 = 0.5 B2).
📊 Quick Conversion Table: B3 to B2
| B3 Sheets | B2 Equivalent | Scale factor (side) | Real‑world use |
|---|---|---|---|
| 0.5 B3 | 0.25 B2 | 100% | Small book signature |
| 1 B3 | 0.5 B2 | 141.4% (enlarge) | Single poster page |
| 2 B3 | 1 B2 | 200% (double width/height) | Full poster |
| 4 B3 | 2 B2 | 282.8% | Book cover spread |
| 5 B3 | 2.5 B2 | 316.2% | Large publication |
| 10 B3 | 5 B2 | 447.2% | Book chapter |
| 25 B3 | 12.5 B2 | 707.1% | Book volume |
| 50 B3 | 25 B2 | 1000% | Large-format catalog |
🖨️ Real‑World Examples: B3 to B2 in Action
- 🖼️ Poster Printing: B3 is often used for medium-sized posters and book covers. When you need to scale up to B2 for larger displays, this converter tells you exactly how many B3 designs fit into a B2 layout.
- 📖 Book Publishing: B3 is used for book signatures and interior pages. B2 is used for book covers and dust jackets. Understanding the scaling helps with production planning.
- 🏛️ Architectural Presentations: B3 is used for detailed floor plans and sections. B2 is used for overall building layouts and presentation boards.
- 🎨 Art & Photography: B3 prints are popular for medium-format art pieces. B2 offers a larger format for exhibition catalogs and portfolios.
- 📬 Marketing Materials: B3 flyers are common for professional handouts. B2 offers more space for detailed marketing content.
💡 Professional Tips for B3 to B2 Scaling
🎯 Resolution & Quality
When scaling from B3 to B2, if your original is 300 DPI, the resulting B2 will be ~212 DPI — still acceptable for most printing. For high-quality prints, design at 600 DPI at B3 to get ~424 DPI at B2.
📐 B‑Series vs. A‑Series
B-series sizes are larger than A-series sizes at the same number. For example, B3 (353 × 500 mm) is larger than A3 (297 × 420 mm). Use B-series when you need more space than A-series offers.
💰 Printing Efficiency
Printing 2 B3 pages from 1 B2 sheet can save paper and costs. Many professional printers support B-series paper sizes — check your printer settings.
📂 Book Production
B3 is a common size for book signatures. When planning a book, understanding how B3 converts to B2 helps with cover design and production planning.
❓ Frequently Asked Questions (B3 to B2)
Q: How many B3 sheets equal 1 B2?
A: Exactly 2 B3 sheets make 1 B2 in terms of area. You can fit two B3 pages on one B2 sheet.
Q: What is the scaling factor from B3 to B2?
A: Each side is scaled by √2 ≈ 1.4142, meaning you enlarge the width and height by 41.4%.
Q: Can I fit a B3 document onto a B2 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 B3 and B2?
A: B2 has exactly double the area of B3 (0.3535 m² vs. 0.1765 m²).
Q: Is B3 bigger than B2?
A: No, B2 is larger. B2 is the next size up from B3. 1 B2 = 2 × B3.
Q: What is B3 used for?
A: B3 is used for posters, book signatures, professional printing, and medium-format design.
Q: What is B2 used for?
A: B2 is used for large posters, book covers, architectural presentations, and large-format marketing.
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, B4 is between A4 and A3 in size.
📈 Why Accurate B3‑to‑B2 Conversion Matters
Accurate scaling between B3 and B2 is essential for professional printing, book production, and document management. Whether you're preparing a poster, designing a book cover, or planning a marketing campaign, 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, poster printing, 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
- B5 = 176 × 250 mm – medium books, notebooks
- 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: B2 to B1, B1 to B0, A4 to A3, A3 to A4, Letter to A4, PX to MM, and DPI Calculator. All designed to make your print and design workflows smoother.