A Series Paper Sizes (ISO 216)
The A series is the most widely used paper size standard in the world, defined by ISO 216. Every size is exactly half the area of the next larger size — fold an A0 sheet in half and you get A1, fold A1 and you get A2, and so on down to A7.
All A series sizes share the same 1:√2 aspect ratio (approximately 1:1.414), which means content scales perfectly between sizes without cropping or distortion.
Quick Reference
| Size | Inches | Millimeters | Common Use |
|---|---|---|---|
| A0 | 33.11 × 46.81 | 841 × 1189 | Technical drawings, large posters |
| A1 | 23.39 × 33.11 | 594 × 841 | Architectural drawings, posters |
| A2 | 16.54 × 23.39 | 420 × 594 | Posters, diagrams |
| A3 | 11.69 × 16.54 | 297 × 420 | Tabloid-size prints, large charts |
| A4 | 8.27 × 11.69 | 210 × 297 | Standard documents, letterheads |
| A5 | 5.83 × 8.27 | 148 × 210 | Booklets, flyers, notepads |
| A6 | 4.13 × 5.83 | 105 × 148 | Postcards, pocket guides |
| A7 | 2.91 × 4.13 | 74 × 105 | Cards, labels, tickets |
A0 Paper SizeA0 paper size is 841 × 1189 mm (33.11 × 46.81 inches). Find A0 dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.
A1 Paper SizeA1 paper size is 594 × 841 mm (23.39 × 33.11 inches). Find A1 dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.
A2 Paper SizeA2 paper size is 420 × 594 mm (16.54 × 23.39 inches). Find A2 dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.
A3 Paper SizeA3 paper size is 297 × 420 mm (11.69 × 16.54 inches). Find A3 dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.
A4 Paper SizeA4 size in inches is 8.27 × 11.69. A4 paper measures 210 × 297 mm. Find A4 dimensions in inches, mm, cm, and pixels at every standard DPI.
A5 Paper SizeA5 paper size is 148 × 210 mm (5.83 × 8.27 inches). Find A5 dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.
A6 Paper SizeA6 paper size is 105 × 148 mm (4.13 × 5.83 inches). Find A6 size dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.
A7 Paper SizeA7 paper size is 74 × 105 mm (2.91 × 4.13 inches). Find A7 dimensions in mm, inches, cm, and pixels at 72, 150, 300, and 600 DPI.