A4 Paper Size Guide
The A4 paper is the most common size of the A series, defined by the international standard ISO 216:2007. A4 paper has an area of 1/16 square metre, with dimensions of 210 mm × 297 mm (8.3 in × 11.7 in).
Visual Size Comparison
A4 paper dimensions
- Width: 210 mm (8.3 inches)
- Height: 297 mm (11.7 inches)
- Area: 1/16 square metre (0.0625 m²)
- Aspect ratio: 1:√2 (1:1.4142)
Paper Dimensions Overview
| Format | Width x Height (mm) | Width x Height (in) | Size Guide |
|---|---|---|---|
| A0 | 841 x 1189 | 33.1 x 46.8 | A0 Size Guide |
| A1 | 594 x 841 | 23.4 x 33.1 | A1 Size Guide |
| A2 | 420 x 594 | 16.5 x 23.4 | A2 Size Guide |
| A3 | 297 x 420 | 11.7 x 16.5 | A3 Size Guide |
| A4 | 210 x 297 | 8.3 x 11.7 | A4 Size Guide |
| A5 | 148 x 210 | 5.8 x 8.3 | A5 Size Guide |
| A6 | 105 x 148 | 4.1 x 5.8 | A6 Size Guide |
| A7 | 74 x 105 | 2.9 x 4.1 | A7 Size Guide |
The A series uses an aspect ratio of 1:√2, which means folding an A4 sheet in half creates two A5 sheets, and so on. This unique property allows for easy scaling without losing proportion.
Common uses of A4 paper
- Business documents and reports
- Letters and correspondence
- School assignments and handouts
- Flyers and brochures
- Everyday printing needs
Printing with A4
A4 is the standard size for most home and office printers. When preparing files for A4 printing, ensure your design software is set to the correct dimensions (210 mm x 297 mm) and use appropriate margins for your content.
Frequently asked questions
What is the ISO 216 standard?
ISO 216 is the international standard that defines the A and B series of paper sizes, including A0 to A10. It's based on the German DIN 476 standard from 1922.
How are A series paper sizes related?
Each A size is half of the size of the previous one. For example, A1 is half of A0, A2 is half of A1, and so on. They all maintain the same aspect ratio of 1:√2.
What are the dimensions of A4 paper?
A4 paper measures 210 mm × 297 mm (8.3 in × 11.7 in).
Is A4 the most common paper size?
Yes, A4 is the most commonly used paper size for business and academic documents in most countries, except for North America where Letter size is more prevalent.
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