Pixel (px) to Millimeter Converter
Use our pixel to millimeter converter to convert pixels to mm instantly using PPI (pixels per inch). Learn the pixel and mm difference, whether pixels and mm are the same, how much mm is 1 pixel (depends on PPI), and the exact pixel to mm conversion formula.
Pixels to mm: What’s the Difference?
Pixels (px) are a digital measurement, while millimeters (mm) are a physical measurement. That’s why pixels and mm are not the same by default.
To convert pixels to millimeters, you need PPI (pixels per inch). PPI tells you how many pixels fit in one inch, which lets you convert pixels into real-world size.
This pixels to millimeters converter helps you do pixel to mm conversion accurately for print, design, and physical sizing.
Pixel to mm Conversion Formula
Convert pixels to inches using PPI, then convert inches to millimeters (1 in = 25.4 mm).
PPI means pixels per inch.
25.4 mm in 1 inch.
This is the direct pixel to mm conversion formula.
Common print workflow using 300 PPI.
A common screen assumption example.
How to Use the Pixel to Millimeter Converter
- 1
Enter your PPI (pixels per inch).
- 2
Enter the pixel value (px).
- 3
The converter calculates mm = (px ÷ PPI) × 25.4.
- 4
Use the mm result for printing, physical sizing, or design specs.
Frequently Asked Questions
No. Pixels are digital units, while mm are physical units. You need PPI to convert between them.
Use mm = (px ÷ PPI) × 25.4. First convert pixels to inches, then inches to millimeters.
It depends on PPI. The formula is mm per pixel = 25.4 ÷ PPI. Higher PPI means fewer mm per pixel.
mm = (pixels ÷ PPI) × 25.4.
Pixels describe digital resolution, while mm describe real-world physical size. PPI connects the two.
Use the PPI of your target output. Print often targets around 300 PPI, while many screen assumptions use 96 PPI. Your exact device/printer specs are best.