What is an MM to PX Converter?
An MM to PX converter translates a physical measurement in millimeters into a digital pixel count based on the target DPI. At 96 DPI, one millimeter equals approximately 3.78 pixels. No data is sent to any server.
How to convert mm to px
Enter the millimeter value and DPI below the converter. The pixel result appears automatically.
- Enter the millimeter value. Type the physical size in the Millimeters field. Decimal values such as 2.5 mm or 0.75 mm are accepted.
- Set the DPI. The converter defaults to 96 DPI which matches standard screen resolution. Change it to 150 or 300 for print work, or enter any custom value your project requires.
- Read the pixel result. The pixel value updates automatically. The converter rounds the result to the nearest whole pixel because most layout and design tools do not accept decimal pixel values.
- Copy or save the result. Click Copy Result to send the pixel value to your clipboard. Use the Download .txt button to save the millimeter input, DPI setting and pixel result as a project note or client handoff record.
MM to PX formula
The formula for converting millimeters to pixels:
px = mm × (DPI ÷ 25.4)
The number 25.4 is the quantity of millimeters in one inch. Dividing DPI by 25.4 gives the number of pixels per millimeter. Multiplying by the millimeter value produces the final pixel count.
Worked example — 25 mm at 96 DPI:
px = 25 × (96 ÷ 25.4) px = 25 × 3.7795 px = 94.49 px = 94 (rounded to nearest whole pixel)
At 300 DPI, the same 25 mm equals 295 pixels. That is more than three times the screen value and shows how significantly DPI shifts the result for print versus screen work.
MM to PX conversion table
All values are rounded to the nearest whole pixel. The formula used is: px = round(mm × DPI ÷ 25.4).
| Millimeters | 72 DPI | 96 DPI | 150 DPI | 300 DPI |
|---|---|---|---|---|
| 1 mm | 3 px | 4 px | 6 px | 12 px |
| 2 mm | 6 px | 8 px | 12 px | 24 px |
| 3 mm | 9 px | 11 px | 18 px | 35 px |
| 5 mm | 14 px | 19 px | 30 px | 59 px |
| 10 mm | 28 px | 38 px | 59 px | 118 px |
| 15 mm | 43 px | 57 px | 89 px | 177 px |
| 20 mm | 57 px | 76 px | 118 px | 236 px |
| 25 mm | 71 px | 94 px | 148 px | 295 px |
| 30 mm | 85 px | 113 px | 177 px | 354 px |
| 50 mm | 142 px | 189 px | 295 px | 591 px |
| 100 mm | 283 px | 378 px | 591 px | 1181 px |
| 210 mm (A4 width) | 595 px | 794 px | 1240 px | 2480 px |
What DPI means for digital measurements
DPI stands for dots per inch. In digital contexts it describes how many pixels fit inside one inch of display or print output. A screen at 96 DPI places 96 pixels across every inch of the display. A printer at 300 DPI places 300 dots across every inch of paper.
Millimeters are absolute physical units. They stay the same regardless of the medium. Pixels are relative. Their physical size shrinks as DPI increases because more pixels occupy the same physical space. Learn more about the DPI standard at the Wikipedia article on dots per inch.
Common DPI values by medium:
- 72 DPI: legacy screen resolution from early Mac displays, still used in some PDF and print contexts
- 96 DPI: current Windows and web standard for screen design
- 150 DPI: midrange print output for laser printers and internal documents
- 300 DPI: professional print standard for sharp clean output on business cards, brochures and packaging
Where to use the MM to PX Converter
Print to digital conversion
A print specification arrives in millimeters and the design tool expects pixels. The converter bridges that gap by calculating the pixel equivalent at the target DPI setting. Graphic designers moving assets from InDesign or Illustrator into a web canvas use this step on every project.
Screen layout design from physical specs
Clients and product teams often deliver hardware dimensions in millimeters. A banner holder, a kiosk screen and a signage panel all carry physical dimensions a designer must translate into pixel canvas sizes. The converter handles that translation for any DPI value the project requires.
Image and banner asset creation
Images for online advertising often begin with physical dimension briefs. A 90 mm × 30 mm banner specification translates into a 340 × 113 pixel canvas at 96 DPI. Using the converter avoids manual math that introduces rounding errors across large asset sets.
Product mockup and packaging design
Physical packaging dimensions are always specified in millimeters. Converting label sizes, box face dimensions and sticker measurements into pixels lets designers build accurate digital mockups before going to print. The PX to CM Converter handles the reverse direction when you need to move confirmed pixel values back to physical measurements for print verification.
Documentation and client handoff
The Download .txt option saves the millimeter input, DPI setting and pixel result in a single file. Developers and project managers use saved results to match design specifications without reopening a design file.
MM to PX converter vs manual calculation
Converting millimeters to pixels manually means dividing the millimeter value by 25.4 and multiplying by DPI. That approach works for a single conversion with clean whole numbers. With decimal inputs or multiple DPI values, manual calculation introduces rounding errors that cascade across an asset set.
The converter applies the formula consistently and rounds only at the final step rather than partway through. Any DPI value works without setup, including custom screen and print resolutions. Switching between DPI settings for screen and print comparison takes one field change.
Compared to a spreadsheet formula, the converter requires no file management and no setup. Web designers, print designers and graphic designers working across physical and digital specifications use the converter to close the unit gap in seconds.
MM to PX conversion for Elementor and Spexo Addons
When building in Elementor, all dimensions are entered in pixels. Physical measurements from client briefs, print specifications or product packaging need to become pixel values before they are usable in the editor. The converter handles that in your browser without switching applications.
Sizing section heights and spacer widgets in Elementor
Elementor lets you set section height and spacer height in pixels. When a layout brief specifies spacing or structural dimensions in millimeters, convert each value before opening the Elementor editor. Spexo Addons provides spacing and layout controls that accept the resulting pixel values directly for height, width and padding fields.
Converting print artwork dimensions for WooCommerce product images
WooCommerce product image dimensions are configured in pixels in the WordPress media settings. Product measurements from a client or supplier arrive in millimeters. Converting to 96 DPI for web previews and 300 DPI for print quality uploads gives you two verified pixel values from a single session.
Building ad banners and hero images from physical dimension briefs
Marketing teams provide banner sizes in millimeters based on physical display or print specifications. Converting those measurements to pixels before opening the Elementor canvas keeps image dimensions accurate from the first frame. Browse the free Elementor templates for hero and banner section layouts you can build directly with the pixel values the converter produces.
FAQs about MM to PX Converter
No. All calculations run locally in your browser. No millimeter values, DPI settings or results are sent to any server.
