Area: 1 B1 = 2 × B2 (B1 is double the area). Scaling factor: √2 ≈ 1.4142 per side.
B-series sizes are used for posters, book printing, envelopes, and large-format publications. This tool helps you scale up from B2 for professional printing and design.
B1 = B2 × 0.5 · Scale factor = √2 ≈ 1.4142 per side2 B2 sheets combine to make 1 B1 sheet (or 1 B1 = 2 B2).
📏 What is B2 Paper Size?
B2 is a medium-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 commonly used for posters, book printing, and large-format publications. It's also popular for high-quality art prints and photographic enlargements. B2 is exactly half the size of B1, making it a versatile intermediate size for professional printing.
📄 What is B1 Paper Size?
B1 is a large paper size in the ISO 216 B-series. Its dimensions are 707 × 1000 mm (27.8 × 39.4 inches), with an area of 0.707 m². B1 is the standard for posters, advertising displays, and large-format publications. It's also used for professional art prints, exhibition banners, and architectural presentations. B1 is exactly double the area of B2, making it a natural step up for more impactful visual communication.
🧮 The Math: How B2 Becomes B1
The ISO 216 B-series is based on the aspect ratio of √2:1, similar to the A-series. Each step up (B2 → B1) doubles the area. The side lengths increase by a factor of √2 ≈ 1.4142.
- Width: 500 mm × √2 ≈ 707 mm
- Height: 707 mm × √2 ≈ 1000 mm
- Area: 0.3535 m² × 2 = 0.707 m²
Formula: 1 B1 = 2 × B2 (in area). So, if you have 2 B2 sheets, they can be combined to form 1 B1 sheet (or 1 B2 = 0.5 B1).
📊 Quick Conversion Table: B2 to B1
| B2 Sheets | B1 Equivalent | Scale factor (side) | Real‑world use |
|---|---|---|---|
| 0.5 B2 | 0.25 B1 | 100% | Small poster |
| 1 B2 | 0.5 B1 | 141.4% (enlarge) | Standard poster |
| 2 B2 | 1 B1 | 200% (double width/height) | Large poster, banner |
| 4 B2 | 2 B1 | 282.8% | Exhibition display |
| 5 B2 | 2.5 B1 | 316.2% | Book cover |
| 10 B2 | 5 B1 | 447.2% | Large publication |
| 25 B2 | 12.5 B1 | 707.1% | Advertising campaign |
| 50 B2 | 25 B1 | 1000% | Billboard‑scale |
🖨️ Real‑World Examples: B2 to B1 in Action
- 🖼️ Poster Printing: B2 is a common poster size. When you need to scale up to B1 for larger displays, this converter tells you exactly how many B2 designs fit into a B1 layout.
- 📖 Book Printing: B2 is used for book covers and large-format publications. B1 is used for oversized books and art books. Convert between them for consistent design.
- 📬 Envelopes & Packaging: B-series sizes are used for envelopes (B4, B5, B6) and packaging. B2 and B1 are used for larger packaging and display materials.
- 🎨 Art & Photography: B2 is popular for limited edition prints. B1 offers a larger format for exhibition catalogs and portfolios.
- 📋 Advertising: B2 posters are common for retail displays. B1 is used for larger advertisements and billboards.
💡 Professional Tips for B2 to B1 Scaling
🎯 Resolution & Quality
When scaling from B2 to B1, if your original is 300 DPI, the resulting B1 will be ~212 DPI — still acceptable for most posters. For high-quality prints, design at 600 DPI at B2 to get ~424 DPI at B1.
📐 B-Series vs A-Series
B-series sizes are larger than A-series sizes. For example, B2 is larger than A3 but smaller than A2. Use the B-series for projects that need more space than A-series can provide.
💰 Printing Efficiency
Printing 2 B2 pages from 1 B1 sheet can save paper and costs. Many professional printers support automatic scaling — check your printer settings for "scale to fit" options.
📂 Professional Standards
B-series sizes are widely used in Europe and Asia for professional printing. Understanding the B-series is essential for international design and print production.
❓ Frequently Asked Questions (B2 to B1)
Q: How many B2 sheets equal 1 B1?
A: Exactly 2 B2 sheets make 1 B1 in terms of area. You can fit two B2 pages on one B1 sheet.
Q: What is the scaling factor from B2 to B1?
A: Each side is scaled by √2 ≈ 1.4142, meaning you enlarge the width and height by 41.4%.
Q: Can I fit a B2 document onto a B1 sheet?
A: Yes, by scaling it up to 141.4% on each dimension. The document will fit with more space around it.
Q: What is the difference in area between B2 and B1?
A: B1 has exactly double the area of B2 (0.707 m² vs. 0.3535 m²).
Q: Is B2 bigger than B1?
A: No, B1 is larger. B1 is the next size up from B2. 1 B1 = 2 × B2.
Q: What is B2 used for?
A: B2 is used for posters, book covers, large-format publications, and art prints.
Q: What is B1 used for?
A: B1 is used for large posters, advertising displays, exhibition banners, and oversized publications.
Q: How does B-series differ from A-series?
A: B-series sizes are larger than their A-series counterparts. For example, B2 is larger than A3 but smaller than A2. B-series is used for posters, books, and envelopes.
Q: What comes before B2?
A: B3 is the next size down (353 × 500 mm). B1 is the next size up.
📈 Why Accurate B2‑to‑B1 Conversion Matters
Accurate scaling between B2 and B1 is essential for professional printing, poster production, and large-format design. Whether you're preparing a poster campaign, designing a book cover, or creating exhibition materials, 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, particularly in Europe and Asia. B-series sizes are often used for posters, books, and envelopes where A-series sizes are too small. This tool supports professional paper size conversions for users worldwide.
📐 The Full B‑Series Hierarchy
- B8 = 62 × 88 mm – small notepads
- B7 = 88 × 125 mm – small notebooks, tags
- B6 = 125 × 176 mm – notecards, envelopes
- B5 = 176 × 250 mm – notebooks, flyers
- B4 = 250 × 353 mm – envelopes, brochures
- B3 = 353 × 500 mm – posters, small displays
- B2 = 500 × 707 mm – posters, book covers, art prints
- B1 = 707 × 1000 mm – large posters, banners, advertising
- B0 = 1000 × 1414 mm – billboards, exhibition displays
Each step up doubles the area, making the system intuitive and easy to scale.
🔗 Explore More Paper & Print Tools
Check out our other converters: A4 to A3, A3 to A4, A4 to A0, B1 to B0, B3 to B2, Letter to A4, PX to MM, and DPI Calculator. All designed to make your print and design workflows smoother.