Pixels to Inches Converter
Convert pixels to inches, centimetres or millimetres at any DPI, and work out the pixels you need.
Physical size4 inat 300 DPI
Inches4 in
Centimetres10.16 cm
Millimetres101.6 mm
Pixels1,200 px
1,200 px at different resolutions
| Resolution | Inches | Centimetres |
|---|---|---|
| 72 DPI | 16.667 in | 42.33 cm |
| 96 DPI | 12.5 in | 31.75 cm |
| 150 DPI | 8 in | 20.32 cm |
| 300 DPI | 4 in | 10.16 cm |
| 600 DPI | 2 in | 5.08 cm |
Pixels have no size on their own
An image of 1200 by 1800 pixels has no physical dimensions until you decide how densely to print them. That density is the DPI (dots per inch) or PPI (pixels per inch):
inches = pixels ÷ DPI and
pixels = inches × DPI
So 1200 px is 4 inches at 300 DPI but 16.7 inches at 72 DPI — the same file, a very different print.
Which resolution to use
- 72 to 96 DPI — historical screen densities, and still the assumption behind the CSS pixel.
- 300 DPI — the standard for photographic print. Below about 240 DPI, fine detail starts to look soft.
- 600 DPI and up — line art, text and technical drawings, where hard edges matter more than tone.
Working backwards
The more useful question is usually how many pixels you need. For an A4 print at 300 DPI that is about 2480 by 3508 px. Enlarging a file beyond its pixel count cannot add detail — it only spreads the same information over more paper.