B4 to B3 Paper Size Converter

Convert B4 to B3 instantly with visual preview. Perfect for magazines, posters, and professional printing. 1 B3 = 2 × B4 (area) — B3 is the larger B-series size.

📐 B4 → B3 Converter ISO 216 B‑Series

Number of B4 sheets 1 B4 = 0.5 B3

1 B4 = 0.5 B3 (area equiv.)

Scale factor: 200% area enlargement

📊 Area Comparison 1 B4 = 0.5 B3 B3 is 2× larger

📏 Dimensions 250 × 353 mm → 353 × 500 mm

📐 Scaling Factor × 1.414 per side (√2)

📄 B4 per B3 2 exact fit

📏 B4 & B3 Dimensions All Units

📄 B4 Paper

Millimeters	250 × 353 mm
Centimeters	25.0 × 35.3 cm
Inches	9.84 × 13.90 in
Points	709 × 1001 pt
Picas	59.1 × 83.4 pc
Pixels (300dpi)	2953 × 4170 px
Pixels (72ppi)	709 × 1001 px

📄 B3 Paper

Millimeters	353 × 500 mm
Centimeters	35.3 × 50.0 cm
Inches	13.90 × 19.69 in
Points	1001 × 1417 pt
Picas	83.4 × 118.1 pc
Pixels (300dpi)	4170 × 5906 px
Pixels (72ppi)	1001 × 1417 px

📄 B4 (250×353 mm)

📄 B3 (353×500 mm)

1 B3 = 2 × B4 · each side scaled by √2 ≈ 1.414

📐 Exact dimensions: B4 = 250 × 353 mm (9.8 × 13.9 in) | B3 = 353 × 500 mm (13.9 × 19.7 in)
Area: 1 B3 = 2 × B4 (double the area). Scaling factor: √2 ≈ 1.4142 per side.
B3 is the go-to size for posters and book signatures — this tool helps you scale up from B4.

🧮 Conversion formula
B3 (area) = B4 × 0.5 · Scale factor = √2 ≈ 1.4142 per side
1 B3 sheet has twice the area of 1 B4 sheet.

📏 What is B4 Paper Size?

B4 is a medium-large paper size in the ISO 216 B-series. Its dimensions are 250 × 353 mm (9.8 × 13.9 inches), with an area of 0.088 m². B4 is widely used for magazines, large books, and professional printing. It sits between A4 (210 × 297 mm) and A3 (297 × 420 mm) in size, offering a versatile format for design and publishing. B4 is exactly half the area of B3, making it a common choice for magazine pages and book signatures.

📄 What is B3 Paper Size?

B3 is a 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 the go-to size for posters, book signatures, and professional printing projects. It's also popular for architectural presentations and large-format marketing materials. B3 is exactly double the area of B4, making it a natural step up for more impactful designs.

🧮 The Math: How B4 Becomes B3

The ISO 216 B-series is based on the geometric mean between A-series sizes. Each step up (B4 → B3) doubles the area. The side lengths increase by a factor of √2 ≈ 1.4142.

Width: 250 mm × √2 ≈ 353 mm
Height: 353 mm × √2 ≈ 500 mm
Area: 0.088 m² × 2 = 0.1765 m²

Formula: 1 B3 = 2 × B4 (in area). So, if you have 2 B4 sheets, they can be combined to form 1 B3 sheet (or 1 B4 = 0.5 B3).

📊 Quick Conversion Table: B4 to B3

B4 Sheets	B3 Equivalent	Scale factor (side)	Real‑world use
0.5 B4	0.25 B3	100%	Small magazine page
1 B4	0.5 B3	141.4% (enlarge)	Single magazine page
2 B4	1 B3	200% (double width/height)	Full poster
4 B4	2 B3	282.8%	Book spread
5 B4	2.5 B3	316.2%	Large publication
10 B4	5 B3	447.2%	Book chapter
25 B4	12.5 B3	707.1%	Book volume
50 B4	25 B3	1000%	Large-format catalog

🖨️ Real‑World Examples: B4 to B3 in Action

📖 Magazine Publishing: B4 is commonly used for magazine pages and book interiors. When you need to scale up to B3 for larger formats or covers, this converter tells you exactly how many B4 pages fit into a B3 layout.
🖼️ Poster Printing: B4 is often used for medium-sized posters and book covers. When you need to scale up to B3 for larger displays, this converter helps you plan the layout.
🏛️ Architectural Presentations: B4 is used for detailed floor plans and sections. B3 is used for overall building layouts and presentation boards.
🎨 Art & Photography: B4 prints are popular for medium-format art pieces. B3 offers a larger format for exhibition catalogs and portfolios.
📬 Marketing Materials: B4 flyers are common for professional handouts. B3 offers more space for detailed marketing content.

💡 Professional Tips for B4 to B3 Scaling

🎯 Resolution & Quality

When scaling from B4 to B3, if your original is 300 DPI, the resulting B3 will be ~212 DPI — still acceptable for most printing. For high-quality prints, design at 600 DPI at B4 to get ~424 DPI at B3.

📐 B‑Series vs. A‑Series

B-series sizes are larger than A-series sizes at the same number. For example, B4 (250 × 353 mm) is larger than A4 (210 × 297 mm). Use B-series when you need more space than A-series offers.

💰 Printing Efficiency

Printing 2 B4 pages from 1 B3 sheet can save paper and costs. Many professional printers support B-series paper sizes — check your printer settings.

📂 Book & Magazine Production

B4 is a common size for magazine pages. When planning a publication, understanding how B4 converts to B3 helps with cover design and production planning.

❓ Frequently Asked Questions (B4 to B3)

Q: How many B4 sheets equal 1 B3?
A: Exactly 2 B4 sheets make 1 B3 in terms of area. You can fit two B4 pages on one B3 sheet.

Q: What is the scaling factor from B4 to B3?
A: Each side is scaled by √2 ≈ 1.4142, meaning you enlarge the width and height by 41.4%.

Q: Can I fit a B4 document onto a B3 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 B4 and B3?
A: B3 has exactly double the area of B4 (0.1765 m² vs. 0.088 m²).

Q: Is B4 bigger than B3?
A: No, B3 is larger. B3 is the next size up from B4. 1 B3 = 2 × B4.

Q: What is B4 used for?
A: B4 is used for magazines, large books, professional printing, and medium-format design.

Q: What is B3 used for?
A: B3 is used for posters, book signatures, 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.

Q: Can I print B4 on B3?
A: Yes, by scaling up to 141.4%. Most printers support this scaling. This tool helps you understand the exact ratio.

📈 Why Accurate B4‑to‑B3 Conversion Matters

Accurate scaling between B4 and B3 is essential for professional printing, book production, and document management. Whether you're preparing a magazine, 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: B3 to B2, B2 to B1, B1 to B0, B5 to B4, 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.