The formula
Print size (inches) = pixels ÷ DPI. Multiply by 2.54 for centimetres. Going the other way, pixels needed = inches × DPI. For example, an 8 × 10 inch print at 300 DPI needs 2400 × 3000 pixels.
Print size calculator: pixels, inches, cm and DPI
Work out how big an image will print, or how many pixels you need for a print size. Type in any two values and the answer updates instantly.
Pixels → print size
Print size: —
Print size → pixels needed
You need: —
Pixels needed for common print sizes
Use 300 DPI for photos and anything viewed up close, 150 DPI as the minimum for large posters viewed from a distance.
| Print size | Pixels at 150 DPI | Pixels at 300 DPI |
|---|---|---|
| Wallet | 375 × 525 | 750 × 1050 |
| 4×6 in | 600 × 900 | 1200 × 1800 |
| 5×7 in | 750 × 1050 | 1500 × 2100 |
| 8×10 in | 1200 × 1500 | 2400 × 3000 |
| 8.5×11 in (Letter) | 1275 × 1650 | 2550 × 3300 |
| A4 (21×29.7 cm) | 1240 × 1754 | 2480 × 3508 |
| 11×14 in | 1650 × 2100 | 3300 × 4200 |
| A3 (29.7×42 cm) | 1754 × 2480 | 3508 × 4961 |
| 16×20 in | 2400 × 3000 | 4800 × 6000 |
| 18×24 in | 2700 × 3600 | 5400 × 7200 |
| A2 (42×59.4 cm) | 2480 × 3508 | 4961 × 7016 |
| 24×36 in | 3600 × 5400 | 7200 × 10800 |
Have the pixels but the wrong DPI?
If your image has enough pixels but says 72 or 96 DPI, you don't need to resize it. Just change the label with the DPI changer and it will print at the right size.
Frequently asked questions
How many pixels is 8×10 at 300 DPI?
2400 × 3000 pixels.
How many pixels is A4 at 300 DPI?
2480 × 3508 pixels.
How do I convert pixels to cm?
Divide the pixels by the DPI to get inches, then multiply by 2.54. At 300 DPI, 1000 pixels is 8.47 cm.
What DPI is best for posters?
150 to 200 DPI is usually enough for posters larger than 18 × 24 inches, because they are viewed from further away.