Choose the size for the job
Use this format when preserving a 4:3 composition matters more than matching a 2:3 frame. For a large display, evaluate a detail at the intended physical scale and consider how the print will actually be viewed.
| Measurement | Value |
|---|---|
| Inches | 18 × 24 |
| Centimetres | 45.72 × 60.96 |
| Millimetres | 457.2 × 609.6 |
| Short-edge-to-long-edge ratio | 3:4 |
Pixel examples
These examples multiply each edge in inches by the stated PPI. They describe pixel counts for the chosen size, not a universal pass or fail rule for appearance. Use the retained pixels after cropping when checking an existing photo.
| Example PPI | Pixels |
|---|---|
| 150 | 2,700 × 3,600 |
| 240 | 4,320 × 5,760 |
| 300 | 5,400 × 7,200 |
A worked example
A 6000 × 4500 landscape file fits a 24 × 18 inch image at 250 PPI. A 4000 × 3000 source fits the same shape at about 166.67 PPI. Both are geometrically correct; the calculator cannot determine whether their visible sharpness will satisfy your particular printing and viewing conditions.
Before you print
The print exceeds both A2 edges, so an A2 PDF cannot contain it at actual size. On A1, a centred portrait image leaves 68.4 mm at the sides and 115.7 mm above and below. Use those spaces as layout measurements, not as a promise that a particular printer supports the sheet.