MM ↔ PX Converter
mmtopixels.com • Length ⇄ Digital

Convert MM to Pixels

Real-time conversion based on PPI resolution.

Decimals
2
PPI

Pixels Per Inch defines the density. Web usually uses 96, standard print uses 300.

mm
px

How to Use Millimeters to Pixels Converter

Using this tool requires no manual calculation. It works in real-time as you type:

  1. Select your Resolution (PPI): By default, this is set to 96 PPI (standard for web design). If you are designing for print, change this to 300 PPI.
  2. Enter Millimeters: Type your value in the "Millimeters" field. The pixel value will appear instantly.
  3. Or, Enter Pixels: You can also type in the "Pixels" field to convert back to millimeters.

Millimeters to Pixels Formula

To calculate pixels from millimeters manually, you need to know the Pixel Per Inch (PPI) density of the display or print medium.

Pixels = Millimeters × ( PPI ÷ 25.4 )

Note: 1 inch is exactly 25.4 millimeters.

Millimeter to Pixel (96 PPI) Conversion Table

Millimeters (mm) Pixels (px) @ 96 PPI
1 mm3.78 px
5 mm18.90 px
10 mm37.80 px
20 mm75.59 px
50 mm188.98 px
100 mm377.95 px

Frequently Asked Questions

How many pixels is 1 mm? ▼
It depends entirely on the PPI. At standard web resolution (96 PPI), 1 mm ≈ 3.78 pixels. For high-quality print (300 PPI), 1 mm ≈ 11.81 pixels.
Is 1 pixel 1 mm? ▼
No. A pixel is a point on a screen, and a millimeter is a physical length. They are only the same size if your screen has a density of exactly 25.4 PPI, which is extremely coarse and rare.
How many pixels is 35x45 mm? ▼
35x45 mm is a standard passport photo size.
  • At 300 PPI (Print): ~413 x 531 pixels
  • At 96 PPI (Screen): ~132 x 170 pixels
What is 40 mm in pixels? ▼
At 96 PPI, 40 mm is approximately 151 pixels. At 300 PPI, it is approximately 472 pixels.