Pixels to Millimeters Converter
Enter the typographical length in pixels below to convert it to millimeters.
Convert Pixels (px) to Millimeters (mm)
Enter a value in pixels (px) (px) to convert to millimeters (mm) (mm).
Pixel to Millimeter Conversion Table
Table showing various pixel measurements converted to millimeters. Click any preset value or arrow to load it into the converter.
| Pixels (px) (px) | Millimeters (mm) (mm) |
|---|---|
| 1 px | 0.2645833 mm |
| 2 px | 0.5291667 mm |
| 2.5 px | 0.6614583 mm |
| 5 px | 1.3229167 mm |
| 10 px | 2.6458333 mm |
| 15 px | 3.96875 mm |
| 20 px | 5.2916667 mm |
| 25 px | 6.6145833 mm |
| 30 px | 7.9375 mm |
| 50 px | 13.2291667 mm |
How to Convert Pixels to Millimeters
To convert pixels to millimeters, multiply the typographical length by the following conversion ratio: 0.2645833 millimeters/pixel.
Since one pixel is equal to 0.2645833 millimeters, you can use this simple formula to convert:
The typographical length in millimeters is equal to the typographical length in pixels multiplied by 0.2645833.
For example, here's how to convert 5 pixels to millimeters using the formula above.
How Many Millimeters Are in a Pixel?
There are 0.2645833 millimeters in a pixel, which is why we use this value in the formula above.
Our pixel to millimeter calculator automatically converts your typographical length measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Pixels and millimeters are both units used to measure typographical length. Keep reading to learn more about each unit.
What Is a Pixel?
A pixel is a unit of typographical length equal to 0.75 points (pt), the base unit for typographical length. W3C CSS reference pixel equal to 1/96 inch (0.75 pt). [1]
The pixel is classified as a standard unit of typographical length. Pixels can be abbreviated as px; for example, 1 pixel can be written as 1 px.
When working with pixels (px) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, pixels (px) are widely used across standard typographical length applications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Millimeter?
A millimeter is a unit of typographical length equal to 2.8346457 points (pt), the base unit for typographical length. 1 mm = 2.83464567 DTP points. [2]
The millimeter is classified as a metric and SI-compatible unit of typographical length. Millimeters can be abbreviated as mm; for example, 1 millimeter can be written as 1 mm.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millimeter (mm) a convenient decimal multiple of the point (pt).
In practice, millimeters (mm) are widely used across standard typographical length applications within SI metric workflows, engineering documentation, and technical data sheets.
When converting typographical length between pixels (px) and millimeters (mm), keep full floating-point precision (1 px = 0.2645833 mm; 1 mm = 3.7795276 px) during intermediate calculations and round only the final millimeter figure to match your instrument tolerance.
More Pixel & Millimeter Conversions
Need to calculate in the opposite direction? Use our millimeters (mm) to pixels (px) calculator to switch your starting unit immediately. You can also explore related tools such as converting millimeters (mm) to pixels (px), converting pixels (px) to points (pt), or converting points (pt) to picas (pc).
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Typography Metrology Standard — Pixels (px) (px) to Millimeters (mm) (mm)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Pixel (CSS 96 DPI) (px) & Millimeter (Print) (mm)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (px to mm)