How to calculate pixel size from millimeters

In our product list we use millimeter sizes instead of pixels. We chose this approach so you can decide for yourself how large the image will be. We’ll always convert it back to the size we need for printing and don’t really mind what format we receive from you. Since our printers run at 300 DPI by default, we recommend using this setting.

Most designers can work with millimeter sizes, but sometimes partners request dimensions in pixels. It’s easy to calculate if you know the math.

To calculate the number of pixels, you need two things:

• A width and height in millimeters
• The amount of pixels in that width/height

The calculation is as follows:

(Width in millimeters / millimeters per inch) * 300 DPI

Example calculation

Width: 60 millimeters

(60 / 25.4) * 300 = 709 pixels

Height: 152 millimeters

(152 / 25.4) * 300 = 1795 pixels