How the DPI calculation works
Print size in inches equals pixels divided by DPI. A 3000 × 2000 pixel image printed at 300 DPI is 10 × 6.67 inches. To go the other way, multiply: an 8 × 10 inch print at 300 DPI needs 2400 × 3000 pixels.
Strictly, PPI (pixels per inch) describes the image file and DPI (dots per inch) describes the printer's output, but most software and print shops use "DPI" for both, and so does this calculator.
Pixels needed at 300 DPI
| Print size | Common use | Pixels at 300 DPI | Pixels at 150 DPI |
|---|---|---|---|
| 3.5 × 4 in | Left chest logo | 1050 × 1200 | 525 × 600 |
| 4 × 6 in | Photo print, postcard | 1200 × 1800 | 600 × 900 |
| 8.5 × 11 in | US Letter flyer | 2550 × 3300 | 1275 × 1650 |
| 8 × 10 in | Photo print | 2400 × 3000 | 1200 × 1500 |
| 11 × 14 in | Standard adult front print | 3300 × 4200 | 1650 × 2100 |
| 12 × 16 in | Large DTF / DTG front | 3600 × 4800 | 1800 × 2400 |
| 18 × 24 in | Poster | 5400 × 7200 | 2700 × 3600 |
| 24 × 36 in | Large poster | 7200 × 10800 | 3600 × 5400 |
What DPI do you need?
- 300 DPI: the standard for anything viewed up close, including flyers, business cards, DTF transfers and DTG prints.
- 150–200 DPI: acceptable for large prints and apparel graphics when you can't get more resolution; detail softens slightly.
- 100–150 DPI: banners, signs and posters viewed from several feet away.
- 72 DPI: web only. A 72 DPI image printed at full size will look pixelated.
Changing the DPI number in an image editor without resampling doesn't add detail; it only changes the print size. If a customer's file is too small, upscale it with an AI upscaler or ask for the original.