PX to MM Converter

Convert pixels to millimeters at any DPI. At the standard 96 DPI used on the web, 1 px = 0.2646 mm.

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The screen resolution (DPI) is dots per inch.
Rounding precision (max 15):

Popular PX Values in Millimeters

At 96 DPI: 1 px = 0.265 mm, 20 px = 5.292 mm, 40 px = 10.583 mm, 50 px = 13.229 mm, 60 px = 15.875 mm, 100 px = 26.458 mm. In print at 300 DPI one pixel is only 0.0847 mm, so 100 px = 8.47 mm.

PX to MM Conversion Table

Millimeters for common pixel values on screen (96 DPI) and in print (300 DPI).

Pixels (px) MM at 96 DPI MM at 300 DPI
1px0.265mm0.085mm
2px0.529mm0.169mm
3px0.794mm0.254mm
5px1.323mm0.423mm
8px2.117mm0.677mm
10px2.646mm0.847mm
12px3.175mm1.016mm
14px3.704mm1.185mm
15px3.969mm1.27mm
16px4.233mm1.355mm
18px4.763mm1.524mm
20px5.292mm1.693mm
24px6.35mm2.032mm
30px7.938mm2.54mm
32px8.467mm2.709mm
40px10.583mm3.387mm
48px12.7mm4.064mm
50px13.229mm4.233mm
60px15.875mm5.08mm
64px16.933mm5.419mm
72px19.05mm6.096mm
80px21.167mm6.773mm
96px25.4mm8.128mm
100px26.458mm8.467mm
120px31.75mm10.16mm
150px39.688mm12.7mm
200px52.917mm16.933mm
300px79.375mm25.4mm
500px132.292mm42.333mm
1000px264.583mm84.667mm

How Wide Will My Image Print?

The printed width of common image sizes. Use 300 DPI for sharp prints; 150 DPI is the lowest that still looks acceptable.

Image width At 300 DPI At 150 DPI
600 px50.8 mm (5.1 cm)101.6 mm (10.2 cm)
1080 px91.4 mm (9.1 cm)182.9 mm (18.3 cm)
1200 px101.6 mm (10.2 cm)203.2 mm (20.3 cm)
1920 px162.6 mm (16.3 cm)325.1 mm (32.5 cm)
2480 px210 mm (21 cm)419.9 mm (42 cm)
3000 px254 mm (25.4 cm)508 mm (50.8 cm)
4000 px338.7 mm (33.9 cm)677.3 mm (67.7 cm)

A 2480 px wide image fills the 210 mm width of an A4 page at 300 DPI. Need an image at an exact pixel size? Use our Image Resizer.

How to Convert PX to MM

Divide by the resolution and multiply by 25.4, because one inch is 25.4 mm:
mm = px × 25.4 ÷ DPI

At 96 DPI that is mm = px × 0.2646, so 100 px × 25.4 ÷ 96 = 26.46 mm. At 300 DPI the same 100 px is only 8.47 mm wide.

Which DPI Should You Use?

  • 96 DPI — websites and CSS. Browsers treat 1 inch as 96 CSS pixels on every device, so this gives the size in your stylesheet.
  • 150 DPI — drafts and office printing. Fine for documents that are read rather than inspected closely.
  • 300 DPI — print quality. The standard for photos, ID pictures, posters and anything printed professionally.

The millimeter on paper never changes — only how many pixels you need to fill it. More DPI means more pixels for the same physical size, and a sharper print.

More Conversion Tools

Frequently Asked Questions (FAQs)

How many millimeters is 1 pixel?

At 96 DPI, 1 px = 0.2646 mm. At 300 DPI, used for printing, 1 px = 0.0847 mm.

How many mm is 100px?

100 px = 26.46 mm at 96 DPI and 8.47 mm at 300 DPI.

How big does a 1080 px image print?

At 300 DPI a 1080 px wide image prints 91.4 mm (9.1 cm) wide. At 150 DPI it prints 182.9 mm wide, but looks less sharp.

Is a pixel always the same size?

No. A screen pixel depends on the display, and a printed pixel depends on the DPI you print at. CSS fixes 1 inch at 96 pixels, which is why converters use 96 DPI by default.

Does EachConvert store my data?

No. All conversions happen entirely in your browser. The values you enter are never sent to our server or saved.