Free online paper size converter
Paper sizes vary by country — ISO A-series globally, ANSI letter sizes in North America. This converter shows exact dimensions in mm, cm, inches, or pixels and includes aspect.
How to use
- Select a paper size from the dropdown.
- Choose the unit you want to see dimensions in.
- Width, height, pixel dimensions, aspect ratio, orientation, and area appear instantly.
- Click “Share with my numbers” to copy a URL with your selection.
Standard paper sizes
| Name | Width (mm) | Height (mm) | Width (in) | Height (in) |
|---|---|---|---|---|
| A0 | 841 | 1189 | 33.11 | 46.81 |
| A1 | 594 | 841 | 23.39 | 33.11 |
| A2 | 420 | 594 | 16.54 | 23.39 |
| A3 | 297 | 420 | 11.69 | 16.54 |
| A4 | 210 | 297 | 8.27 | 11.69 |
| A5 | 148 | 210 | 5.83 | 8.27 |
| A6 | 105 | 148 | 4.13 | 5.83 |
| Letter | 215.9 | 279.4 | 8.50 | 11.00 |
| Legal | 215.9 | 355.6 | 8.50 | 14.00 |
| Tabloid | 279.4 | 431.8 | 11.00 | 17.00 |
| Executive | 184.15 | 266.7 | 7.25 | 10.50 |
| Ledger | 431.8 | 279.4 | 17.00 | 11.00 |
| B4 | 250 | 353 | 9.84 | 13.90 |
| B5 | 176 | 250 | 6.93 | 9.84 |
Pixel conversion formula
Pixels = (mm ÷ 25.4) × DPI
At 96 dpi (standard screen): A4 width = (210 ÷ 25.4) × 96 ≈ 794 px.
For print at 300 dpi: multiply any 96 dpi value by 300/96 ≈ 3.125.
Notes
- ISO 216 A-series sizes have an aspect ratio of √2 ≈ 1.414, so each size folds exactly in half to make the next smaller size.
- Ledger and Tabloid are the same physical sheet; Ledger is landscape, Tabloid is portrait.
- Source: ISO 216:2007 for A/B series; ANSI/ASME Y14.1 for US sizes.
Frequently asked
What are the dimensions of A4 paper?
A4 paper is 210 × 297 mm (8.27 × 11.69 inches, or approximately 794 × 1123 pixels at 96 dpi). It is the standard office paper size in most countries outside North America.
How does A4 compare to US Letter?
US Letter is 215.9 × 279.4 mm (8.5 × 11 inches). It is slightly wider and shorter than A4. Both are common office paper sizes but are not interchangeable when printing without margin adjustments.
What pixel dimensions should I use for A4 at 300 dpi for print?
At 300 dpi: A4 is 2480 × 3508 pixels. At 96 dpi (screen): approximately 794 × 1123 pixels. This converter shows 96 dpi values — multiply by the ratio for other DPI settings.
What is the ISO 216 paper size standard?
ISO 216 defines the A-series and B-series paper sizes. Each A-size is exactly half the area of the size above it — A5 is half of A4, A4 is half of A3. The aspect ratio is always √2 ≈ 1.414.
What is the aspect ratio of A4 paper?
The aspect ratio of A4 is √2, expressed approximately as 1.414. This is a property of all ISO 216 A-series sizes.
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