300 DPI Calculator
Find the pixel dimensions you need for printing at 300 DPI, or check the effective DPI of an image printed at a chosen size.
Maximum print size at target DPI
10 x 6.67 inches
Excellent for photo-quality printing at close viewing distance.
Effective DPI at desired width
300 DPI
Excellent for photo-quality printing at close viewing distance.
This page is centred on 300 DPI, but you can change the target above to compare.
How to use this calculator
1. Enter image dimensions in pixels. 2. Pick a target DPI to see the maximum print size. 3. Enter a desired print width to see its effective DPI.
Formula
Print width (in) = Pixel width / DPI. Pixel width needed = Print width (in) x DPI.
Paper sizes and viewing distance
| Size | Millimeters | Pixels at 300 DPI |
|---|---|---|
| A5 | 148 x 210 mm | 1748 x 2480 px |
| A4 | 210 x 297 mm | 2480 x 3508 px |
| A3 | 297 x 420 mm | 3508 x 4961 px |
| Viewing situation | Target DPI | Why |
|---|---|---|
| Close-up photo | 300 | Held in the hand; fine detail is visible. |
| Wall poster | 150 | Viewed from a few feet away; finer detail cannot be resolved. |
| Billboard | 72 | Viewed from far away; 300 DPI would be wasted pixels. |
Frequently asked questions
When is 300 DPI the right choice?
Photo-quality close-up printing.