ISO 216 — A series
A9 size
37 × 52 mm
1.46 × 2.05 in · 3.7 × 5.2 cm
A9 measures 37 × 52 mm (3.7 × 5.2 cm; 1.46 × 2.05 in). At 300 DPI that is 437 × 614 pixels.
Millimetres
37 × 52 mm
Centimetres
3.7 × 5.2 cm
Inches
1.46 × 2.05 in
Points (pt)
105 × 147 pt
A9 in pixels
| DPI | Pixels (portrait) | Typical use |
|---|---|---|
| 72 | 105 × 147 | Legacy screen standard, PDF points |
| 96 | 140 × 197 | Screens, CSS pixels |
| 150 | 219 × 307 | Everyday printing |
| 300 | 437 × 614 | Print quality |
Adjacent sizes
FAQ — A9
What size is A9 in centimetres?
A9 is 3.7 × 5.2 cm (37 × 52 mm) in portrait orientation.
How many pixels is A9?
It depends on the resolution: at 300 DPI (print) A9 is 437 × 614 pixels; at 96 DPI (screen) it is 140 × 197 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 A8 in half and you get A9. That is why documents scale between sizes without distortion.
What is A9 used for?
Small labels.