Common photo print sizes at 300, 240 and 150 PPI
Pixel dimensions come from inches × PPI = pixels. For example, an 8 × 10 inch print at 300 PPI needs 2,400 × 3,000 pixels. The table uses exact multiplication and does not add bleed.
| Finished size | Aspect ratio | 300 PPI | 240 PPI | 150 PPI |
|---|---|---|---|---|
| 4 × 6 in | 2:3 | 1,200 × 1,800 px | 960 × 1,440 px | 600 × 900 px |
| 5 × 7 in | 5:7 | 1,500 × 2,100 px | 1,200 × 1,680 px | 750 × 1,050 px |
| 8 × 10 in | 4:5 | 2,400 × 3,000 px | 1,920 × 2,400 px | 1,200 × 1,500 px |
| 8 × 12 in | 2:3 | 2,400 × 3,600 px | 1,920 × 2,880 px | 1,200 × 1,800 px |
| 10 × 12 in | 5:6 | 3,000 × 3,600 px | 2,400 × 2,880 px | 1,500 × 1,800 px |
| 11 × 14 in | 11:14 | 3,300 × 4,200 px | 2,640 × 3,360 px | 1,650 × 2,100 px |
A4 and US Letter pixel dimensions
A4 and US Letter are paper sizes, not interchangeable photo ratios. A4 is 210 × 297 mm under ISO 216; US Letter is 8.5 × 11 inches. A photo that does not share the paper ratio needs cropping, borders or a layout with margins.
| Finished size | Aspect ratio | 300 PPI | 240 PPI | 150 PPI |
|---|---|---|---|---|
| A4 (210 × 297 mm) | 1:√2 | 2,480 × 3,508 px | 1,984 × 2,806 px | 1,240 × 1,754 px |
| US Letter (8.5 × 11 in) | 17:22 | 2,550 × 3,300 px | 2,040 × 2,640 px | 1,275 × 1,650 px |
A4 values are rounded to the nearest practical whole pixel. If a production system requires rounding upward, use the inches-to-pixels calculator with the exact millimetre or inch conversion specified by the printer.
Which PPI should you choose?
300 PPI is a common target for close-viewed photo and art prints. 240 PPI can be acceptable when the print provider supports it, while 150 PPI is a larger-print compromise whose result depends more heavily on viewing distance and source quality. The printer's stated image requirement takes priority over a general chart.
PPI is not the same as the printer's advertised DPI. PPI describes image pixels placed across one inch of the finished print; device DPI describes output dots. Read the PPI vs DPI guide before substituting one number for the other.
Check whether your existing photo is large enough
Divide the image width by the intended print width and the image height by the intended print height. Use the lower result as the limiting effective PPI. A 3,000 × 2,400 px image printed at 10 × 8 inches is 300 PPI on both axes.
Use the pixels-to-inches calculator to enter the photo dimensions or read them from a local image. The file remains in the browser and is not uploaded.
Aspect ratio decides whether the photo will crop
Pixel count alone cannot make one ratio fit another. A 4 × 6 and an 8 × 12 print both use 2:3, so the same uncropped composition scales between them. An 8 × 10 print uses 4:5 and crops a 2:3 camera image unless you add borders or extend the canvas.
Do not stretch width or height independently to force a match. Choose the crop deliberately, add borders, or select a print size with the same ratio as the source. For edge-to-edge artwork, add the printer's requested bleed after deciding the finished size.
Does changing the PPI field create detail?
No. With resampling disabled, changing PPI metadata changes the intended physical size while the pixel dimensions stay the same. Resampling can create new pixels, but it cannot reconstruct source detail that was never captured. Inspect focus and compression at the intended output size instead of trusting the metadata number alone.