How Print Size Is Calculated
Print size is determined by dividing an image’s pixel dimensions by its DPI (Dots Per Inch). The formula is simple:
Print Width (inches) = Pixel Width ÷ DPI
For example, a 3000 × 2000 pixel image at 300 DPI produces a 10 × 6.67 inch print. The same image at 72 DPI would print at 41.7 × 27.8 inches — huge but very low quality.
Key guidelines for print quality:
- 300 DPI — the gold standard for professional photo prints and marketing materials.
- 150 DPI — acceptable for large-format prints (posters, banners) viewed from 2+ feet.
- 72 DPI — suitable only for screens; prints at this resolution will appear pixelated.
- Upscaling doesn’t add detail — stretching a small image to a larger print size reduces quality.