Choose the size for the job
A large print does not require a different aspect ratio from 4 × 6, but it benefits from a separate resolution and detail review. Inspect the original rather than a compressed message attachment, and examine a representative area at the intended physical scale.
| Measurement | Value |
|---|---|
| Inches | 24 × 36 |
| Centimetres | 60.96 × 91.44 |
| Millimetres | 609.6 × 914.4 |
| Short-edge-to-long-edge ratio | 2:3 |
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 | 3,600 × 5,400 |
| 240 | 5,760 × 8,640 |
| 300 | 7,200 × 10,800 |
A worked example
A 6000 × 4000 landscape photo fits 36 × 24 inches at about 166.67 PPI. A 300 PPI example would require 10800 × 7200 landscape pixels. The calculator reports the difference without claiming that the smaller source is automatically unacceptable or that upscaling recreates absent detail.
Before you print
This rectangle is larger than A1 in both directions. On A0, the portrait print leaves 115.7 mm at each side and 137.3 mm above and below when centred. Such a page may exceed a desktop printer’s capabilities; a geometrically valid PDF is not evidence of device support.