Quick answer: 1 mm = 3.7795 px
About the Millimetres to Pixels
Pixels have no fixed physical size: how big a pixel is depends on the resolution (DPI or PPI). On screens and in CSS, 96 pixels make one inch, so 1 cm ≈ 37.8 px. In print at 300 DPI, 1 cm = 118.1 px.
Set the DPI that matches what you're doing, then enter the value to convert. The table below shows common values at 72, 96, 150 and 300 DPI.
How to convert millimetres to pixels
- Enter your numbers (or keep the example).
- The result updates instantly as you type.
- Copy the result, or copy the link: it keeps your numbers so you can share them.
mm to px conversion table
| mm | at 72 DPI | at 96 DPI | at 150 DPI | at 300 DPI |
|---|---|---|---|---|
| 1 mm | 2.835 px | 3.78 px | 5.906 px | 11.811 px |
| 2 mm | 5.669 px | 7.559 px | 11.811 px | 23.622 px |
| 3 mm | 8.504 px | 11.339 px | 17.717 px | 35.433 px |
| 5 mm | 14.173 px | 18.898 px | 29.528 px | 59.055 px |
| 10 mm | 28.346 px | 37.795 px | 59.055 px | 118.11 px |
| 15 mm | 42.52 px | 56.693 px | 88.583 px | 177.165 px |
| 20 mm | 56.693 px | 75.591 px | 118.11 px | 236.22 px |
| 21 mm | 59.528 px | 79.37 px | 124.016 px | 248.031 px |
| 25 mm | 70.866 px | 94.488 px | 147.638 px | 295.276 px |
| 29.7 mm | 84.189 px | 112.252 px | 175.394 px | 350.787 px |
| 30 mm | 85.039 px | 113.386 px | 177.165 px | 354.331 px |
| 50 mm | 141.732 px | 188.976 px | 295.276 px | 590.551 px |
How it's calculated
Pixels = millimetres ÷ 25.4 × DPI.
Features
- Instant resultsUpdates as you type.
- Shareable linkThe URL keeps your inputs.
- Reference tableCommon values on this page.
- Works offlineRuns in your browser.
Frequently asked questions
How many pixels are in 1 mm?
At 96 DPI: 3.78 px. At 300 DPI: 11.8 px.
Is the Millimetres to Pixels free?
Yes, the Millimetres to Pixels is free with no sign-up, no limits and no ads covering the result.
Does it work on my phone?
Yes. It works in any modern browser on phones, tablets and computers, and keeps working offline once the page has loaded.
Last updated · Processing happens locally in your browser.