How it's calculated
inches = pixels ÷ DPI
pixels = pixel count, DPI = dots (pixels) per inch, inches = physical length. Reverse: pixels = inches × DPI. Common DPI: 72, 96, 150, 300.
Common values
| Pixels | At 96 DPI | At 300 DPI |
|---|---|---|
| 96 | 1 in | 0.32 in |
| 300 | 3.13 in | 1 in |
| 600 | 6.25 in | 2 in |
| 1200 | 12.5 in | 4 in |
Common questions
Why is 96 DPI the default?
The W3C CSS spec fixes 96 DPI as the reference for the CSS inch, so on-screen layout assumes it.
What DPI should I use for print?
Print work commonly uses 300 DPI, which gives sharp detail at normal viewing distance.