Area: 1 B1 = 2 × B2 (B2 is half the area). Scaling factor: 1/√2 ≈ 0.7071 per side.
B1 is the go-to size for large posters, architectural presentations, and professional displays. This tool helps you scale down to B2 for printing and document management.
B2 = B1 × 2 · Scale factor = 1/√2 ≈ 0.7071 per side1 B1 sheet splits into exactly 2 B2 sheets (or 1 B2 = 0.5 B1).
📏 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 widely used for posters, architectural presentations, large-scale drawings, and professional displays. It's the standard size for many design projects and is often seen in art galleries, offices, and conference venues. B1 is exactly twice the size of B2, making it perfect for high-impact visual communication.
📄 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 the go-to size for medium posters, wall calendars, architectural drawings, and large-format marketing displays. It's also popular for art prints and photographic enlargements. B2 is exactly half the area of B1, making it a natural choice for documents that need to be filed or displayed in standard portfolio cases.
🧮 The Math: How B1 Becomes B2
The ISO 216 B-series is based on the geometric mean between A-series sizes, with an aspect ratio of √2:1. Each step down (B1 → B2) halves the area. The side lengths decrease by a factor of 1/√2 ≈ 0.7071.
- Width: 707 mm × (1/√2) ≈ 500 mm
- Height: 1000 mm × (1/√2) ≈ 707 mm
- Area: 0.707 m² ÷ 2 = 0.3535 m²
Formula: 1 B1 = 2 × B2 (in area). So, if you have 1 B1 sheet, you can print 2 B2 pages from it (or fold it in half to create a B2 booklet).
📊 Quick Conversion Table: B1 to B2
| B1 Sheets | B2 Equivalent | Scale factor (side) | Real‑world use |
|---|---|---|---|
| 0.5 B1 | 1 B2 | 100% (B2 = half B1) | Single poster, medium display |
| 1 B1 | 2 B2 | 70.7% (reduce) | Two-poster spread, presentation |
| 2 B1 | 4 B2 | 50% (half width/height) | Four-poster gallery display |
| 5 B1 | 10 B2 | 31.6% | Multi-panel exhibition |
| 10 B1 | 20 B2 | 22.4% | Large exhibition stand |
| 25 B1 | 50 B2 | 14.1% | Conference poster series |
| 50 B1 | 100 B2 | 10% | Large-format catalog |
| 100 B1 | 200 B2 | 7.1% | Billboard-scale planning |
🖨️ Real‑World Examples: B1 to B2 in Action
- 🖼️ Poster Printing: B1 posters are common for conferences and events. When you need to produce B2 handouts or smaller versions, this converter tells you exactly how many you can make from each B1 sheet.
- 🏛️ Architectural Presentations: B1 is used for building plans and site layouts. B2 is used for detailed sections and elevations. Switching between them is seamless with the 1/√2 scaling.
- 🎨 Art Prints: Many artists work on B1, but for gallery exhibitions, B2 offers a more manageable size. This converter helps plan the print run and edition sizes.
- 📊 Trade Show Displays: B1 is used for large backdrops and banners; B2 is used for supporting materials and handouts. Convert between them for consistent branding.
- 📬 Direct Mail Marketing: B1 posters can be designed, and then the same artwork can be scaled to B2 for smaller-format mailers or flyers.
💡 Professional Tips for B1 to B2 Scaling
🎯 Resolution & Quality
When reducing from B1 to B2, if your original is 300 DPI, the resulting B2 will be ~424 DPI — actually higher quality! This is because you're concentrating the same pixels into a smaller area. For best results, design at 300 DPI at B1 for sharp B2 prints.
📐 Text Size Considerations
When scaling down from B1 to B2, text will appear smaller. For posters and presentations, ensure your font sizes are at least 18-24pt at B1 so they remain readable at B2 (approximately 12-16pt after scaling).
💰 Printing Efficiency
Printing 2 B2 pages from 1 B1 sheet can save paper and costs. Many large-format printers support automatic scaling — check your printer settings for "scale to fit" options.
📂 Portfolio & Storage
B1 is often too large for standard portfolios and filing cabinets. Converting to B2 makes documents easier to store, transport, and present. Use this converter to plan your document management.
❓ Frequently Asked Questions (B1 to B2)
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 B1 to B2?
A: Each side is scaled by 1/√2 ≈ 0.7071, meaning you reduce the width and height by 29.3%.
Q: Can I fit a B1 document onto a B2 sheet?
A: Yes, by scaling it down to 70.7% on each dimension. The document will fit, but text and details will be smaller.
Q: What is the difference in area between B1 and B2?
A: B1 has exactly double the area of B2 (0.707 m² vs. 0.3535 m²).
Q: Is B1 bigger than B2?
A: Yes, B1 is larger. B1 is the next size up from B2. 1 B1 = 2 × B2.
Q: What is B1 used for?
A: B1 is used for posters, architectural plans, large-scale drawings, trade show displays, and art prints.
Q: What is B2 used for?
A: B2 is used for medium posters, wall calendars, architectural details, and large-format marketing materials.
Q: Can I print B1 on B2?
A: Yes, most large-format printers have a "scale to fit" option that automatically reduces B1 to B2. This tool helps you understand the ratio.
Q: What's the difference between B-series and A-series?
A: B-series sizes are geometric means between A-series sizes. B1 is between A0 and A1 in size, offering more size options for professional printing.
📈 Why Accurate B1‑to‑B2 Conversion Matters
Accurate scaling between B1 and B2 is essential for professional design, printing, and document management. Whether you're preparing a conference poster, designing an architectural presentation, 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 worldwide. B-series sizes are particularly popular in Europe and Asia for posters, books, and professional printing. This tool supports professional paper size conversions for users worldwide.
📐 The Full B‑Series Hierarchy
- B6 = 125 × 176 mm – small books, pocket notebooks
- B5 = 176 × 250 mm – medium notebooks, books
- B4 = 250 × 353 mm – large notebooks, sheet music
- B3 = 353 × 500 mm – posters, flip charts
- B2 = 500 × 707 mm – medium posters, architectural plans
- B1 = 707 × 1000 mm – large posters, banners, presentations
- 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: A4 to A3, A3 to A4, A3 to A2, A2 to A1, A1 to A2, Letter to A4, PX to MM, and DPI Calculator. All designed to make your print and design workflows smoother.