Exact size comparison
A2 vs 18 × 24: close poster sizes with different proportions.
The 18 × 24 inch sheet is 37.2 mm wider and 15.6 mm taller than A2. An A2 poster cannot be enlarged to fill it without cropping or changing margins.
The short answer
A2 follows the ISO 1:√2 ratio; 18 × 24 uses a 3:4 ratio and is visibly wider for its height.
The 18 × 24 inch sheet is 37.2 mm wider and 15.6 mm taller than A2. An A2 poster cannot be enlarged to fill it without cropping or changing margins. The difference is 37.2 mm in width and 15.6 mm in height.
Side by side
A2 and 18 × 24 dimensions
| Measurement | A2 | 18 × 24 | Difference |
|---|---|---|---|
| Width | 420 mm / 16.54 in | 457.2 mm / 18 in | 37.2 mm |
| Height | 594 mm / 23.39 in | 609.6 mm / 24 in | 15.6 mm |
| Area | 0.2495 m² | 0.2787 m² | 292 cm² |
| 300 DPI | 4961 × 7016 px | 5400 × 7200 px | Different canvas |
| Primary context | ISO markets | North American posters | Workflow-dependent |
Choose A2 when
- The printer and frame use ISO A sizes
- The design belongs to an A-series campaign
- You need clean scaling to A1 or A3
Choose 18 × 24 when
- The frame is exactly 18 × 24 inches
- The vendor offers North American poster presets
- The wider 3:4 composition suits the artwork
Ask the print provider for the final trim size and bleed before resizing artwork. Adding canvas is safer than stretching the design.
Questions people ask
A2 vs 18 × 24 FAQ
Is A2 the same size as 18 × 24?
No. A2 is 420 × 594 mm; 18 × 24 is 457.2 × 609.6 mm.
Which is wider, A2 or 18 × 24?
18 × 24 is 37.2 mm wider.
Which is taller, A2 or 18 × 24?
18 × 24 is 15.6 mm taller.
Can I print one format on the other?
Often, but not at identical proportions. Ask the print provider for the final trim size and bleed before resizing artwork. Adding canvas is safer than stretching the design.
Use the numbers