Conversion Formula
1 inch = 25.4 millimeters
1 inch = [DPI/PPI] pixels
px = mm × (DPI / 25.4)
DPI (Dots Per Inch) or PPI (Pixels Per Inch) determines how many pixels represent one inch in the digital space. Higher DPI means more pixels per physical unit.
Millimeters to Pixels Conversion Table
Common conversions at standard resolutions:
At 96 PPI (Standard Screen Resolution)
| Millimeters (mm) | Pixels (px) |
|---|---|
| 1 mm | 3.78 px |
| 5 mm | 18.90 px |
| 10 mm | 37.80 px |
| 20 mm | 75.59 px |
| 50 mm | 188.98 px |
| 100 mm | 377.95 px |
| 210 mm (A4 width) | 793.70 px |
| 297 mm (A4 height) | 1122.52 px |
At 300 DPI (High Quality Print)
| Millimeters (mm) | Pixels (px) |
|---|---|
| 1 mm | 11.81 px |
| 5 mm | 59.06 px |
| 10 mm | 118.11 px |
| 20 mm | 236.22 px |
| 50 mm | 590.55 px |
| 100 mm | 1181.10 px |
About Millimeters to Pixels Conversion
Converting millimeters to pixels is essential when translating physical dimensions to digital displays or print media. This conversion depends on the resolution (DPI/PPI) of the target medium.
How to Convert mm to px
To convert millimeters to pixels:
- Determine the DPI/PPI of your target medium (screen or print)
- Multiply the millimeter value by the DPI/PPI
- Divide the result by 25.4 (millimeters in one inch)
- The result is the equivalent measurement in pixels
Example: Convert 10mm to pixels at 300 DPI
(10 × 300) / 25.4 = 118.11 px
Understanding DPI vs PPI
DPI (Dots Per Inch): Used primarily for print, refers to the number of ink dots a printer can place in one inch.
PPI (Pixels Per Inch): Used for digital displays, refers to the number of pixels a screen displays in one inch.
For practical purposes in digital design, they can be treated the same when converting measurements.
Common DPI/PPI Settings
- 72 PPI: Traditional screen resolution (now outdated for most modern screens)
- 96 PPI: Standard Windows screen resolution
- 150 DPI: Minimum resolution for acceptable print quality
- 300 DPI: Standard resolution for high-quality printing
- 600+ DPI: Professional printing (photo books, high-end brochures)
Applications of mm to px Conversion
This conversion is particularly important for:
- Web and app design (converting physical dimensions to screen elements)
- Print design (preparing digital files for physical printing)
- CAD and engineering drawings
- Digital art and illustration
- Creating responsive designs that match physical products