When working on print design, knowing the exact paper sizes in inches, millimeters, and centimeters is essential. Whether you’re designing posters, brochures, business stationery, packaging, or envelopes, this guide gives you a quick, accurate reference you can rely on daily.
International paper sizes follow the ISO standard, divided into A, B, and C series, each serving a different design purpose.
🅰️ A Series Paper Sizes (Most Common for Print)
The A series is the most widely used paper size system worldwide.
Perfect for documents, posters, flyers, books, and marketing materials.
| Size | Inches (in) | Millimeters (mm) | Centimeters (cm) |
|---|---|---|---|
| A0 | 33.1 × 46.8 | 841 × 1189 | 84.1 × 118.9 |
| A1 | 23.4 × 33.1 | 594 × 841 | 59.4 × 84.1 |
| A2 | 16.5 × 23.4 | 420 × 594 | 42.0 × 59.4 |
| A3 | 11.7 × 16.5 | 297 × 420 | 29.7 × 42.0 |
| A4 | 8.3 × 11.7 | 210 × 297 | 21.0 × 29.7 |
| A5 | 5.8 × 8.3 | 148 × 210 | 14.8 × 21.0 |
| A6 | 4.1 × 5.8 | 105 × 148 | 10.5 × 14.8 |
| A7 | 2.9 × 4.1 | 74 × 105 | 7.4 × 10.5 |
| A8 | 2.0 × 2.9 | 52 × 74 | 5.2 × 7.4 |
| A9 | 1.5 × 2.0 | 37 × 52 | 3.7 × 5.2 |
| A10 | 1.0 × 1.5 | 26 × 37 | 2.6 × 3.7 |
Best use cases:
A4 – resumes, brochures, flyers
A3 – posters, menus
A1 / A0 – large posters, banners, wall graphics
🅱️ B Series Paper Sizes (Posters & Books)
The B series is mainly used for books, envelopes, large prints, and special poster formats.
It sits between A sizes, giving more layout flexibility.
| Size | Inches (in) | Millimeters (mm) | Centimeters (cm) |
|---|---|---|---|
| B0 | 39.4 × 55.7 | 1000 × 1414 | 100 × 141.4 |
| B1 | 27.8 × 39.4 | 707 × 1000 | 70.7 × 100 |
| B2 | 19.7 × 27.8 | 500 × 707 | 50 × 70.7 |
| B3 | 13.9 × 19.7 | 353 × 500 | 35.3 × 50 |
| B4 | 9.8 × 13.9 | 250 × 353 | 25 × 35.3 |
| B5 | 6.9 × 9.8 | 176 × 250 | 17.6 × 25 |
| B6 | 4.9 × 6.9 | 125 × 176 | 12.5 × 17.6 |
| B7 | 3.5 × 4.9 | 88 × 125 | 8.8 × 12.5 |
| B8 | 2.4 × 3.5 | 62 × 88 | 6.2 × 8.8 |
| B9 | 1.7 × 2.4 | 44 × 62 | 4.4 × 6.2 |
| B10 | 1.2 × 1.7 | 31 × 44 | 3.1 × 4.4 |
Best use cases:
Books, notebooks, posters, certificates, packaging inserts
🅲 C Series Paper Sizes (Envelopes)
The C series is designed specifically for envelopes.
A C-size envelope perfectly fits the corresponding A-size paper.
| Size | Inches (in) | Millimeters (mm) | Centimeters (cm) |
|---|---|---|---|
| C0 | 36.1 × 51.1 | 917 × 1297 | 91.7 × 129.7 |
| C1 | 25.5 × 36.1 | 648 × 917 | 64.8 × 91.7 |
| C2 | 18.0 × 25.5 | 458 × 648 | 45.8 × 64.8 |
| C3 | 12.8 × 18.0 | 324 × 458 | 32.4 × 45.8 |
| C4 | 9.0 × 12.8 | 229 × 324 | 22.9 × 32.4 |
| C5 | 6.4 × 9.0 | 162 × 229 | 16.2 × 22.9 |
| C6 | 4.5 × 6.4 | 114 × 162 | 11.4 × 16.2 |
| C7 | 3.2 × 4.5 | 81 × 114 | 8.1 × 11.4 |
| C8 | 2.2 × 3.2 | 57 × 81 | 5.7 × 8.1 |
| C9 | 1.6 × 2.2 | 40 × 57 | 4.0 × 5.7 |
| C10 | 1.1 × 1.6 | 28 × 40 | 2.8 × 4.0 |
Example:
A4 paper → fits perfectly inside a C4 envelope
🎯 Designer Pro Tips (Save Time Daily)
-
Always design print files in millimeters (mm)
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Use 300 DPI for print clarity
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Add 3–5 mm bleed on all sides
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CMYK color mode for print, RGB for screen
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Confirm size with printer before final export
📌 Why Designers Bookmark This Page
✔ All paper sizes in one place
✔ Accurate for print & production
✔ Easy conversion (in → mm → cm)
✔ Perfect daily reference for designers
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