ISO 216 — A series
A3 size
297 × 420 mm
11.69 × 16.54 in · 29.7 × 42 cm
A3 measures 297 × 420 mm (29.7 × 42 cm; 11.69 × 16.54 in). At 300 DPI that is 3508 × 4961 pixels.
Millimetres
297 × 420 mm
Centimetres
29.7 × 42 cm
Inches
11.69 × 16.54 in
Points (pt)
842 × 1191 pt
A3 in pixels
| DPI | Pixels (portrait) | Typical use |
|---|---|---|
| 72 | 842 × 1191 | Legacy screen standard, PDF points |
| 96 | 1123 × 1587 | Screens, CSS pixels |
| 150 | 1754 × 2480 | Everyday printing |
| 300 | 3508 × 4961 | Print quality |
Adjacent sizes
FAQ — A3
What size is A3 in centimetres?
A3 is 29.7 × 42 cm (297 × 420 mm) in portrait orientation.
How many pixels is A3?
It depends on the resolution: at 300 DPI (print) A3 is 3508 × 4961 pixels; at 96 DPI (screen) it is 1123 × 1587 pixels.
How is the A series defined?
Every ISO 216 A-series size has a √2 ≈ 1:1.414 aspect ratio. Each size is half the previous one: fold A2 in half and you get A3. That is why documents scale between sizes without distortion.
What is A3 used for?
Diagrams, presentations, drawings, spreads.