Pixel to Millimeter (px to mm)
Convert px to mm — Typography converter
One pixel equals 0.26458333 mm, so to convert pixels to millimeters you multiply the value by 0.26458333. A pixel is smaller than a millimeter — going the other way, 1 mm = 3.779528 px. For example, 10 px = 2.645833 mm and 50 px = 13.229167 mm.
1 px = 0.26458333 mm
Pixel to Millimeter formula
1 Pixel = 0.26458333 mm
Worked examples
- 25 px = 6.614583 mm
- 100 px = 26.458333 mm
Pixel to Millimeter conversion table
| Pixel (px) | Millimeter (mm) |
|---|---|
| 1 | 0.26458333 |
| 8 | 2.116667 |
| 10 | 2.645833 |
| 11 | 2.910417 |
| 12 | 3.175 |
| 14 | 3.704167 |
| 16 | 4.233333 |
| 18 | 4.7625 |
| 20 | 5.291667 |
| 24 | 6.35 |
| 32 | 8.466667 |
| 36 | 9.525 |
| 48 | 12.7 |
| 64 | 16.933333 |
| 72 | 19.05 |
Why 16 px equals 12 pt
Two fixed definitions drive every conversion on this page. A typographic point is 1/72 of an inch. A CSS reference pixel is 1/96 of an inch. That makes 1 px exactly 0.75 pt, and 16 px exactly 12 pt — which is why 16 px became the default body size on the web: it matches the 12 pt that print had already settled on.
A pica is 12 points, so 1 pica = 16 px. InDesign, Quark and most print workflows measure column widths and gutters in picas; CSS has no pica unit, so those measurements have to be converted before they reach a stylesheet. On this page, 1 px = 0.26458333 mm.
The CSS pixel is a reference unit, not a hardware pixel. On a 2× or 3× display, one CSS px still occupies 1/96 inch of visual space — the device simply renders it with more physical pixels. Converting CSS px to physical pixels requires the device pixel ratio, which is a separate calculation from anything on this page.
Metric print specs go through the inch: 1 in = 25.4 mm = 96 px = 72 pt. A 210 mm A4 page width is therefore about 794 px at 96 dpi — useful when matching a web layout to a printed one.
Frequently asked questions
How many millimeters are in one pixel?
One pixel equals 0.26458333 millimeters (mm).
How many pixels are in one millimeter?
One millimeter equals 3.779528 pixels (px).
How do you convert pixels to millimeters?
1 Pixel = 0.26458333 mm. Use the calculator above for any value.
What is 5 px in mm?
5 px = 1.322917 mm.
What is 100 px in mm?
100 px = 26.458333 mm.
What is 12 px in mm?
12 px = 3.175 mm.
What is 14 px in mm?
14 px = 3.704167 mm.
What is 16 px in mm?
16 px = 4.233333 mm.
What is 18 px in mm?
18 px = 4.7625 mm.
What is 24 px in mm?
24 px = 6.35 mm.
Is a pixel bigger than a millimeter?
No. A pixel is smaller — one pixel equals 0.26458333 millimeters, while one millimeter equals 3.779528 pixels.