PX to MM Converter
Convert pixel values to millimeters for precise print design and physical measurements with DPI-aware calculations. Perfect for international print design and precision requirements.
At 96 DPI: 1mm ≈ 3.78px · 1px ≈ 0.265mm
Complete Guide: PX to MM Converter
Everything you need to know about using this tool effectively
The PX to MM Converter transforms pixel measurements into millimeters using a configurable DPI value. The formula is mm = px / DPI × 25.4. At 96 DPI, one inch (25.4 mm) equals 96 pixels. This tool is essential for engineers, manufacturers, and designers who work in metric units. All processing happens in your browser.
This tool divides the pixel value by DPI to get inches, then multiplies by 25.4 to convert to millimeters. You enter the pixel measurement and set the DPI, and the tool calculates the millimeter equivalent.
Engineering specifications
Convert pixel-based digital designs to millimeter measurements for CAD or manufacturing specs.
Print production in metric regions
Convert digital pixel dimensions to millimeters for print shops that use metric standards.
Packaging design
Map pixel artwork dimensions to millimeter measurements for product packaging layouts.
Screen to physical measurement
Determine the physical millimeter size of a UI element on a screen based on its DPI.
Enter pixel value
Type the pixel measurement you want to convert.
Set DPI
Choose or enter the DPI value (96 for screen, 300 for print).
View the result
The millimeter equivalent is displayed instantly.
Copy the value
Copy the converted measurement for use in your project.
1 inch = 25.4 millimeters, which is the constant used in the conversion.
96 DPI is the standard for screen content.
300 DPI is common for print-quality output.
Double-check DPI values when working with manufacturing specs.
What is the formula for px to mm?
The formula is mm = px / DPI × 25.4. You divide pixels by DPI to get inches, then multiply by 25.4 to get millimeters.
Is my data sent to a server?
No. All conversion happens locally in your browser. Nothing is transmitted.
What DPI should I use?
Use 96 DPI for screen-based content. Use 300 DPI for standard print output. Match the DPI to your target output device.
Can I convert mm back to pixels?
Yes. The tool supports bidirectional conversion. Enter the millimeter value and DPI to get the pixel equivalent.
Why do I need to set DPI for a metric conversion?
DPI connects digital pixels to physical measurements. Without DPI, pixels have no physical size. The DPI value determines how many pixels fit in one inch, which is then converted to millimeters.