ISO 216 — A series
A4 size
210 × 297 mm
8.27 × 11.69 in · 21 × 29.7 cm
A4 measures 210 × 297 mm (21 × 29.7 cm; 8.27 × 11.69 in). At 300 DPI that is 2480 × 3508 pixels.
Millimetres
210 × 297 mm
Centimetres
21 × 29.7 cm
Inches
8.27 × 11.69 in
Points (pt)
595 × 842 pt
A4 in pixels
| DPI | Pixels (portrait) | Typical use |
|---|---|---|
| 72 | 595 × 842 | Legacy screen standard, PDF points |
| 96 | 794 × 1123 | Screens, CSS pixels |
| 150 | 1240 × 1754 | Everyday printing |
| 300 | 2480 × 3508 | Print quality |
Adjacent sizes
FAQ — A4
What size is A4 in centimetres?
A4 is 21 × 29.7 cm (210 × 297 mm) in portrait orientation.
How many pixels is A4?
It depends on the resolution: at 300 DPI (print) A4 is 2480 × 3508 pixels; at 96 DPI (screen) it is 794 × 1123 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 A3 in half and you get A4. That is why documents scale between sizes without distortion.
Are A4 and Letter the same?
No. A4 is 210 × 297 mm while Letter is 215.9 × 279.4 mm — Letter is 6 mm wider and 18 mm shorter. Documents laid out for A4 reflow when printed on Letter (and vice versa).
What is A4 used for?
The standard for documents, letters and printing in Europe.