Area: 1 B2 = 2 × B3 (B3 is half the area). Scaling factor: 1/√2 ≈ 0.7071 per side.
The B-series is widely used for posters, envelopes, and book printing. This tool helps you scale between these professional paper sizes.
B3 = B2 × 2 · Scale factor = 1/√2 ≈ 0.7071 per side1 B2 sheet splits into exactly 2 B3 sheets (or 1 B3 = 0.5 B2).
📏 What is B2 Paper Size?
B2 is a 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 B-series equivalent of A2 in the A-series. It's widely used for posters, wall calendars, book covers, and large-format printing. The B-series is designed to provide intermediate sizes between A-series sizes, making it particularly useful for publishing and book production.
📄 What is B3 Paper Size?
B3 is a 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 the B-series equivalent of A3 in the A-series. It's commonly used for book pages, medium-sized posters, envelopes, and professional printing. B3 is exactly half the area of B2, making it a natural choice for book layouts and document management.
🧮 The Math: How B2 Becomes B3
The ISO 216 B-series is based on the geometric mean between A-series sizes. Each step down (B2 → B3) halves the area. The side lengths decrease by a factor of 1/√2 ≈ 0.7071.
- Width: 500 mm × (1/√2) ≈ 353 mm
- Height: 707 mm × (1/√2) ≈ 500 mm
- Area: 0.3535 m² ÷ 2 = 0.1765 m²
Formula: 1 B2 = 2 × B3 (in area). So, if you have 1 B2 sheet, you can print 2 B3 pages from it (or fold it in half to create a B3 booklet).
📊 Quick Conversion Table: B2 to B3
| B2 Sheets | B3 Equivalent | Scale factor (side) | Real‑world use |
|---|---|---|---|
| 0.5 B2 | 1 B3 | 100% (B3 = half B2) | Single book page |
| 1 B2 | 2 B3 | 70.7% (reduce) | Two-page spread, booklet |
| 2 B2 | 4 B3 | 50% (half width/height) | Four-page brochure |
| 5 B2 | 10 B3 | 31.6% | Small book chapter |
| 10 B2 | 20 B3 | 22.4% | Booklet or catalog |
| 25 B2 | 50 B3 | 14.1% | Short book |
| 50 B2 | 100 B3 | 10% | Magazine or catalog |
| 100 B2 | 200 B3 | 7.1% | Large publication |
🖨️ Real‑World Examples: B2 to B3 in Action
- 📖 Book Publishing: B2 is used for book covers and large-format pages. B3 is used for standard book pages and internal layouts. This converter helps publishers plan their page layouts and printing efficiently.
- 📬 Envelope Production: B-series sizes are often used for envelope production. B2 and B3 correspond to common envelope sizes for professional correspondence.
- 🖼️ Poster Printing: B2 posters are common for medium-sized displays. B3 is used for smaller promotional materials. Convert between them for consistent branding.
- 📊 Architectural Plans: B2 is used for detailed architectural drawings. B3 is used for smaller reference documents and presentations.
- 🎨 Art & Photography: B2 is popular for art prints and photographic enlargements. B3 is used for portfolios and smaller prints.
💡 Professional Tips for B2 to B3 Scaling
🎯 Resolution & Quality
When scaling from B2 to B3, if your original is 300 DPI, the resulting B3 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 B2 for sharp B3 prints.
📐 Text Size Considerations
When scaling down from B2 to B3, text will appear smaller. For book publishing and posters, ensure your font sizes are at least 12-14pt at B2 so they remain readable at B3 (approximately 8-10pt after scaling).
💰 Printing Efficiency
Printing 2 B3 pages from 1 B2 sheet can save paper and costs. Many professional printers support automatic scaling — check your printer settings for "scale to fit" options.
📂 Book Production
B2 is often used for printing multiple book pages on a single sheet. Understanding the B2 to B3 ratio helps with layout planning and reducing paper waste in book production.
❓ Frequently Asked Questions (B2 to B3)
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 B2 to B3?
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 B2 document onto a B3 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 B2 and B3?
A: B2 has exactly double the area of B3 (0.3535 m² vs. 0.1765 m²).
Q: Is B2 bigger than B3?
A: Yes, B2 is larger. B2 is the next size up from B3. 1 B2 = 2 × B3.
Q: What is B2 used for?
A: B2 is used for posters, book covers, wall calendars, and large-format printing.
Q: What is B3 used for?
A: B3 is used for book pages, medium posters, envelopes, and professional printing.
Q: How does the B-series compare to the A-series?
A: The B-series provides intermediate sizes between A-series sizes. B2 is between A1 and A2, while B3 is between A2 and A3.
Q: What comes before B2?
A: B1 is the next size up (707 × 1000 mm). B3 is the next size down.
📈 Why Accurate B2‑to‑B3 Conversion Matters
Accurate scaling between B2 and B3 is essential for professional publishing, printing, and document management. Whether you're producing a book, designing a poster, or planning an envelope 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, particularly in publishing and envelope production. B2 and B3 are widely used in Europe, Asia, and other regions for professional printing and publishing. This tool supports professional paper size conversions for users worldwide.
📐 The Full B‑Series Hierarchy
- B10 = 31 × 44 mm – very small envelopes
- B9 = 44 × 62 mm – small envelopes
- B8 = 62 × 88 mm – small books, pocket notes
- B7 = 88 × 125 mm – small books, envelopes
- B6 = 125 × 176 mm – medium books, envelopes
- B5 = 176 × 250 mm – standard books, envelopes
- B4 = 250 × 353 mm – large books, magazines
- B3 = 353 × 500 mm – medium posters, book pages
- B2 = 500 × 707 mm – large posters, book covers
- B1 = 707 × 1000 mm – very large posters, display boards
- B0 = 1000 × 1414 mm – billboards, large 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, Letter to A4, PX to MM, and DPI Calculator. All designed to make your print and design workflows smoother.