A3 Paper Size Guide
The A3 paper is the fourth largest size of the A series, defined by the international standard ISO 216:2007. A3 paper has an area of 0.125 square metres, with dimensions of 297 mm × 420 mm (11.7 in × 16.5 in).
Visual Size Comparison
A3 paper dimensions
- Width: 297 mm (11.7 inches)
- Height: 420 mm (16.5 inches)
- Area: 0.125 square metres
- 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 A3 sheet in half creates two A4 sheets, and so on. This unique property allows for easy scaling without losing proportion.
Common uses of A3 paper
- Posters and small-scale advertising
- Architectural and engineering drawings
- Large charts and diagrams
- Detailed maps
- Art prints and photographs
Printing with A3
Many office printers can handle A3 paper, but for high-quality or large volume printing, professional print shops are often used. When preparing files for A3 printing, ensure your design software is set to the correct dimensions and use high-resolution images (300 DPI or higher) for best results.
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 A3 paper?
A3 paper measures 297 mm × 420 mm (11.7 in × 16.5 in).
How does A3 compare to A2 and A4?
A3 is half the size of A2 and twice the size of A4. When you fold an A2 sheet in half, you get an A3 sheet.
Can I print A3 at home?
Some home printers can handle A3 paper, but it's less common than A4. Many office printers and professional print shops can easily accommodate A3 size.
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