Pixels to millimeters
Type a value in pixels to see it in millimeters straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the pixels box.
- Read the result in millimeters as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mm = px × 0.2645833333
Multiply the value in pixels by 0.2645833333 to get millimeters.
Example
To convert 25 px to millimeters: 25 × 0.2645833333 = 6.61458 mm.
Conversion table
| Pixels (px) | Millimeters (mm) |
|---|---|
| 1 | 0.264583 |
| 2 | 0.529167 |
| 3 | 0.79375 |
| 5 | 1.32292 |
| 10 | 2.64583 |
| 20 | 5.29167 |
| 25 | 6.61458 |
| 50 | 13.2292 |
| 100 | 26.4583 |
| 250 | 66.1458 |
| 500 | 132.292 |
| 1,000 | 264.583 |
About the units
- Pixel
- The CSS reference pixel is exactly 1/96 inch, or 0.75 point. Its physical size on a screen varies with the device pixel density.
- Millimeter
- A millimeter is exactly one thousandth of a meter, used for paper sizes and print margins, such as A4 at 210 mm wide.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many millimeters are in one pixel?
1 px = 0.264583 mm exactly.
How do I convert pixels to millimeters?
Use mm = px × 0.2645833333. For example, 25 px = 6.61458 mm.
How many pixels are in one millimeter?
1 mm = 3.77953 px.
Why is 12 pt text 16 px on screen?
CSS defines one inch as 96 px and 72 pt, so a point is 4/3 px and 12 pt is 16 px. The physical size still depends on screen density and zoom.
Is this point the same as the traditional printer's point?
No, it is the desktop publishing point of 1/72 inch used by CSS, PDF and Word. The old American printer's point is close to 1/72.27 inch, about 0.4% smaller.