Paper Size Reference
Size
✓A4 Dimensions
mm × mm
210 × 297
inches
8.27 × 11.69
ISO 216 defines the A-series paper sizes (A4, A3, A0...) using a √2:1 ratio so each size is exactly half the area of the one above. A4 (210×297mm) is the global standard.
- 1A0 = 841×1189mm (exactly 1m² area)
- 2Each subsequent size = fold in half along long edge
- 3√2:1 aspect ratio preserved throughout the series
- 4US Letter = 216×279mm (slightly different ratio)
A4 dimensions=210 mm × 297 mm = 8.27" × 11.69"
| Size | mm | Inches (approx) |
|---|---|---|
| A1 | 594×841 | 23.4×33.1 |
| A2 | 420×594 | 16.5×23.4 |
| A3 | 297×420 | 11.7×16.5 |
| A4 | 210×297 | 8.3×11.7 |
| A5 | 148×210 | 5.8×8.3 |
References
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