A4 vs A3
Dimensions, area and a same-scale visual comparison.
A4 vs A3
A4
210 × 297 mm
A3
297 × 420 mm
Width difference: 87 mm
Height difference: 123 mm
Area difference: 623.7 cm²
Relative area: 50% (A4 as a share of A3)
| Attribute | A4 | A3 |
|---|---|---|
| Dimensions (mm) | 210 × 297 | 297 × 420 |
| Dimensions (in) | 8.27 × 11.69 | 11.69 × 16.54 |
| Area | 623.7 cm² | 1,247.4 cm² |
| Aspect ratio | 1 : 1.414 | 1 : 1.414 |
| Standard / region | ISO 216 / International | ISO 216 / International |