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Look up ISO 216 standard B series paper sizes. Get exact millimeter and inch dimensions for B0 to B10, plus a visual comparison chart.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This reference lists B0 through B10 with dimensions in millimeters and approximate inches. Each row is short side × long side, so B5 is 176 × 250 mm, or about 6.9 × 9.8 in. Turn the sheet to landscape by swapping the measurements; the paper size does not change.
The B series is part of ISO 216, which specifies trimmed sizes for writing paper and certain printed matter. ISO describes its scope as administrative, commercial, and technical uses; it does not necessarily cover newspapers, books, posters, or every specialty item. Inch values here are rounded conversions of the listed millimeter dimensions.
| Size | Millimeters (short × long) | Approx. inches |
|---|---|---|
| B0 | 1000 × 1414 mm | 39.4 × 55.7 in |
| B1 | 707 × 1000 mm | 27.8 × 39.4 in |
| B2 | 500 × 707 mm | 19.7 × 27.8 in |
| B3 | 353 × 500 mm | 13.9 × 19.7 in |
| B4 | 250 × 353 mm | 9.8 × 13.9 in |
| B5 | 176 × 250 mm | 6.9 × 9.8 in |
| B6 | 125 × 176 mm | 4.9 × 6.9 in |
| B7 | 88 × 125 mm | 3.5 × 4.9 in |
| B8 | 62 × 88 mm | 2.4 × 3.5 in |
| B9 | 44 × 62 mm | 1.7 × 2.4 in |
| B10 | 31 × 44 mm | 1.2 × 1.7 in |
Within an ISO paper series, increasing the number by one indicates a sheet about half the area of the previous size. B-series proportions follow the square-root-of-two relationship, so a sheet can be halved while retaining a similar shape. Published dimensions use rounded whole millimeters; deriving every row from another rounded row can create small differences.
US offices commonly use named formats such as Letter and Legal. Those are separate conventions: B5 is not US Letter, and this chart does not convert between systems.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter B5 or B10 to find that row. The full label avoids matching a dimension that appears in multiple rows.
Use the listed dimensions as the reference. For portrait keep the order shown; for landscape swap width and height.
The inch column is shown to one decimal place for quick comparison. Confirm exact production requirements with the receiving printer.
Example: B5 is 176 mm wide by 250 mm high in portrait orientation; in landscape, use 250 mm by 176 mm.
Use cases
See how the tool fits into real work and everyday tasks.
Choose the B-number requested by a publisher or print specification, then enter its millimeter dimensions in page setup.
Use the rounded inch column to judge fit, then confirm exact output dimensions before printing.
Compare neighboring rows to see how the numbered series changes as the sheet is halved.
Q&A
Find concise answers to common questions and confusing cases.
B5 is approximately 6.9 × 9.8 inches; its listed metric dimensions are 176 × 250 mm.
No. ISO B5 is 176 × 250 mm, while US Letter is a distinct named format. This page lists the ISO B series only.
The chart writes the short side first and long side second. Swap the values for landscape orientation.
Notes
Review scope, result limitations, and important precautions before use.
This is a dimensional lookup, not a print-preflight check. It does not account for bleed, safe areas, binding, paper weight, printer margins, or regional variants such as JIS B sizes. Confirm the requested standard and orientation with the printer, publisher, or device before ordering or exporting.
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