Paper Size Converter
Compare A-series, B-series, Letter, Legal, and Tabloid paper sizes in mm, cm, and inches.
Embed this toolPaper Size Reference Table
| Size | Category | Dimensions (mm) | Dimensions (inches) | Area (cm²) |
|---|---|---|---|---|
| A0 | ISO A | 841 × 1189 mm | 33.1 × 46.8 in | 9999.5 cm² |
| A1 | ISO A | 594 × 841 mm | 23.4 × 33.1 in | 4995.5 cm² |
| A2 | ISO A | 420 × 594 mm | 16.5 × 23.4 in | 2494.8 cm² |
| A3 | ISO A | 297 × 420 mm | 11.7 × 16.5 in | 1247.4 cm² |
| A4 | ISO A | 210 × 297 mm | 8.3 × 11.7 in | 623.7 cm² |
| A5 | ISO A | 148 × 210 mm | 5.8 × 8.3 in | 310.8 cm² |
| A6 | ISO A | 105 × 148 mm | 4.1 × 5.8 in | 155.4 cm² |
| Letter | US | 216 × 279 mm | 8.5 × 11.0 in | 602.6 cm² |
| Legal | US | 216 × 356 mm | 8.5 × 14.0 in | 769.0 cm² |
| Tabloid | US | 279 × 432 mm | 11.0 × 17.0 in | 1205.3 cm² |
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Understanding Paper Size Standards
Paper sizes around the world follow two main standards: ISO 216 (used in most of the world) and North American sizes (used in the US, Canada, and parts of Mexico).
ISO 216 — The A-Series
The ISO 216 standard defines the A, B, and C series of paper sizes. The A-series is the most common. It is based on a single aspect ratio of √2 ≈ 1.414 (1:√2). This unique ratio means that when you fold a sheet in half along its longest side, the resulting page has the exact same proportions as the original.
- A0 has an area of exactly 1 square meter (841 × 1189 mm).
- Each subsequent size (A1, A2, A3…) is half the area of the previous one.
- A4 (210 × 297 mm) is the standard for letters, documents, and printing worldwide.
North American Paper Sizes
The United States, Canada, and a few other countries use a different set of paper sizes defined by the American National Standards Institute (ANSI). These sizes do not share a consistent aspect ratio.
- Letter (8.5 × 11 in / 216 × 279 mm) is the standard for everyday documents and business correspondence.
- Legal (8.5 × 14 in / 216 × 356 mm) is commonly used for contracts and legal documents.
- Tabloid (11 × 17 in / 279 × 432 mm) is popular for newspapers, brochures, and large-format printing.
Why Do A4 and Letter Cause Printing Issues?
Because A4 and Letter have different dimensions and aspect ratios, a document formatted for one may not fit correctly on the other. A4 is slightly narrower and taller than Letter. When printing A4 documents on Letter paper, content near the bottom may be cut off, while Letter documents on A4 may have extra margins on the sides.
Quick Tip
When designing documents for international audiences, use A4 as the default. Most modern software and printers can scale documents between A4 and Letter, but always check the print preview before sending to the printer.
Frequently Asked Questions
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