Quick answer: 100 px = 26.4583 mm
About the Pixels to Millimetres
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 pixels to millimetres
- 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.
px to mm conversion table
| px | at 72 DPI | at 96 DPI | at 150 DPI | at 300 DPI |
|---|---|---|---|---|
| 1 px | 0.352778 mm | 0.264583 mm | 0.169333 mm | 0.084667 mm |
| 10 px | 3.528 mm | 2.646 mm | 1.693 mm | 0.846667 mm |
| 50 px | 17.639 mm | 13.229 mm | 8.467 mm | 4.233 mm |
| 100 px | 35.278 mm | 26.458 mm | 16.933 mm | 8.467 mm |
| 200 px | 70.556 mm | 52.917 mm | 33.867 mm | 16.933 mm |
| 300 px | 105.833 mm | 79.375 mm | 50.8 mm | 25.4 mm |
| 500 px | 176.389 mm | 132.292 mm | 84.667 mm | 42.333 mm |
| 600 px | 211.667 mm | 158.75 mm | 101.6 mm | 50.8 mm |
| 800 px | 282.222 mm | 211.667 mm | 135.467 mm | 67.733 mm |
| 1000 px | 352.778 mm | 264.583 mm | 169.333 mm | 84.667 mm |
| 1080 px | 381 mm | 285.75 mm | 182.88 mm | 91.44 mm |
| 1920 px | 677.333 mm | 508 mm | 325.12 mm | 162.56 mm |
How it's calculated
Millimetres = pixels ÷ DPI × 25.4.
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 Pixels to Millimetres free?
Yes, the Pixels to Millimetres 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.