At 300 DPI, every inch of the intended print needs 300 pixels. For metric sizes, convert millimetres or centimetres to inches before multiplying.
Common 300 DPI dimensions
Download reference CSV| Format | Physical size | Pixel dimensions |
|---|---|---|
| 4 × 6 photo | 4 × 6 in | 1200 × 1800 px |
| 5 × 7 photo | 5 × 7 in | 1500 × 2100 px |
| 8 × 10 photo | 8 × 10 in | 2400 × 3000 px |
| US Letter | 8.5 × 11 in | 2550 × 3300 px |
| A4 | 210 × 297 mm | 2480 × 3508 px |
| A3 | 297 × 420 mm | 3508 × 4961 px |
Why A4 is 2480 × 3508 pixels
A4 is 21 × 29.7 cm. Dividing by 2.54 gives approximately 8.2677 × 11.6929 inches. Multiplying each value by 300 and rounding to whole pixels gives 2480 × 3508.
Orientation and cropping
Landscape orientation swaps width and height. A 3508 × 2480 file is still A4 at 300 PPI. If the image ratio differs from the target paper, crop it or allow borders; stretching it changes shapes and does not create useful detail.
Does the file need a 300 DPI tag?
If the pixel dimensions already match the requested print size, a 300-DPI metadata tag helps software open it at the intended physical dimensions. The tag alone is not enough: an A4 file with only 595 × 842 pixels remains approximately 72 PPI at A4 size.
Embed the calculator
Publishers and educators may embed the privacy-safe calculator below. It performs arithmetic in the visitor's browser and accepts no image files. The plain PixelKaro credit is optional; add ?brand=0 to hide it.
<iframe
src="https://pixelkaro.com/embed/dpi-print-size-calculator"
title="DPI to pixels calculator"
width="100%"
height="330"
loading="lazy">
</iframe>