Pixel (CSS) to Millimeter Converter
1 CSS pixel is about 0.2645833333 millimeters. Convert CSS pixels (px) to millimeters (mm) below: type a value and the result updates as you type.
px to mm calculator
Result
Pixel (CSS) to Millimeter conversion
1 px ≈ 0.2645833333 mmone CSS pixel in millimeters
1 mm ≈ 3.779527559 pxone millimeter in CSS pixels
Pixel (CSS) (px): The CSS reference pixel: exactly 1/96 inch, or 0.75 point. Real screen pixels vary in size.
Millimeter (mm): One thousandth of a meter.
Source:Pixel (CSS): W3C CSS Values and Units Module Level 3 (absolute lengths); Millimeter: SI Brochure, 9th edition (BIPM, 2019)
How to convert CSS pixels to millimeters
To convert CSS pixels to millimeters, multiply the number of CSS pixels by about 0.2645833333.
Formula
mm = px × 0.2645833333
The factor is rounded here. The calculator uses the exact value.
Examples
- 5 px = 5 × 0.2645833333 ≈ 1.322916667 mm
- 25 px = 25 × 0.2645833333 ≈ 6.614583333 mm
- 100 px = 100 × 0.2645833333 ≈ 26.45833333 mm
Pixel (CSS) to Millimeter conversion table
| Pixel (CSS) (px) | Millimeter (mm) |
|---|---|
| 0.1 px | 0.02645833333 mm |
| 0.5 px | 0.1322916667 mm |
| 1 px | 0.2645833333 mm |
| 2 px | 0.5291666667 mm |
| 3 px | 0.79375 mm |
| 5 px | 1.322916667 mm |
| 10 px | 2.645833333 mm |
| 20 px | 5.291666667 mm |
| 25 px | 6.614583333 mm |
| 50 px | 13.22916667 mm |
| 100 px | 26.45833333 mm |
| 250 px | 66.14583333 mm |
| 500 px | 132.2916667 mm |
| 1000 px | 264.5833333 mm |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many millimeters are in one CSS pixel?
- One CSS pixel is about 0.2645833333 millimeters.
- How do I convert millimeters to CSS pixels?
- To convert millimeters to CSS pixels, multiply the number of millimeters by about 3.779527559. The formula is px = mm × 3.779527559.
- Is this conversion exact?
- Yes. Both units have exact definitions, but the factor has more decimal places than can be shown, so displayed results are rounded. The calculator works with 50 significant digits before rounding.
- Which is larger, a CSS pixel or a millimeter?
- A millimeter is about 3.779527559 times larger than a CSS pixel. In other words, a CSS pixel is about 0.2645833333 of a millimeter.