Photo print sizes

Choose by use

Small prints can suit albums or repeated layouts; framed and large prints need closer attention to the opening and available pixels. Square and panoramic formats make stronger composition changes when the source has another shape. These groups help you compare options, rather than prescribing a use for every photograph.

Same shape, different size

The 4 × 6, 8 × 12, 12 × 18, 16 × 24, 20 × 30, and 24 × 36 formats share a 2:3 shape. The same crop can fit all of them, but the PPI falls as its physical size increases. The 8 × 10 and 16 × 20 formats form a separate 4:5 family.

Formats such as 3.5 × 5 and 10 × 12 have their own exact ratios even though the ratio directory does not create a page for every size. Use each size’s measurements rather than assuming that nearby numbers describe the same shape.

Read the units

The named photo formats here use inches. One inch is exactly 25.4 mm, so 4 × 6 inches is 101.6 × 152.4 mm, not exactly 10 × 15 cm. A vendor’s nominal metric product can share the shape while differing in physical dimensions.

The size names are grounded in first-party photo-print catalogs. They establish that the format exists, not that every supplier offers it or that a particular frame opening is exact. Check the order specification and final crop preview.

Use the pixel tables as examples

Each page shows 150, 240, and 300 PPI calculations to make the arithmetic easy to compare. These are not universal quality thresholds. Open your source, inspect its actual detail, and use the retained pixels after cropping for the effective PPI.