Pixel ↔ MM Converter
pixeltomm.com • px ⇄ mm

Pixel (X) to Millimeter (MM) Calculator

Real-time conversion based on custom DPI/PPM.

Decimals:
2

Default 96 DPI is standard for web browsers. PPM (Pixels Per Millimeter) is more direct.

Pixels (px)
Millimeters (mm)

📐 How Pixel to MM Works

The conversion between Pixels (X) and Millimeters (MM) is not fixed; it depends entirely on the resolution of the device or image, which is usually defined by DPI (Dots Per Inch) or PPM (Pixels Per Millimeter).

The core formula connects these units:

MM = Pixels / PPM PPM = DPI / 25.4

Since 1 inch is equal to 25.4 millimeters, dividing the DPI by 25.4 gives you the equivalent number of pixels in a single millimeter (PPM).

Pixel (X) to Millimeter Conversion Table

Approximate conversions at a common 96 DPI (3.7795 Pixels/mm):

Pixels (X) Millimeters (MM)
1 px0.265 mm
10 px2.646 mm
50 px13.229 mm
100 px26.458 mm
500 px132.292 mm

❓ Frequently Asked Questions

What is 1 pixel in mm?
The size of 1 pixel in millimeters is variable. It depends on the screen or image's resolution, typically measured in DPI (Dots Per Inch). At a standard 96 DPI, 1 pixel is approximately 0.264583 mm. The conversion is: mm = Pixels / (DPI / 25.4).
Is 1 pixel 1 cm?
No, 1 pixel is significantly smaller than 1 centimeter. At a typical 96 DPI resolution, 1 pixel is only about 0.0264583 centimeters (or 0.264583 millimeters).
How many pixels is equal to 1 mm?
The number of pixels equal to 1 mm depends entirely on the resolution (DPI). For example, at 96 DPI, 1 mm is equal to approximately 3.7795 pixels. The formula is: Pixels = mm * (DPI / 25.4).
How many pixels is 30 mm?
The number of pixels for 30 mm depends on the DPI. At a common 96 DPI resolution, 30 mm is equal to approximately 113.385 pixels. Use the calculator above to find the exact value for any DPI.