MM to PX Converter

Convert millimeters to pixels at any DPI. At the standard 96 DPI used on the web, 1 mm = 3.7795 px.

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

Popular MM Sizes in Pixels

At 96 DPI: 3 mm = 11.34 px, 10 mm = 37.8 px, 35 mm = 132.28 px, 45 mm = 170.08 px and 100 mm = 377.95 px. For print at 300 DPI, 35 mm = 413 px and 45 mm = 531 px. For any other value or DPI, use the converter above.

MM to PX Conversion Table

Pixels for common millimeter values on screen (96 DPI) and in print (300 DPI).

Millimeters (mm) Pixels at 96 DPI Pixels at 300 DPI
1mm3.78px12px
2mm7.559px24px
3mm11.339px35px
5mm18.898px59px
8mm30.236px94px
10mm37.795px118px
12mm45.354px142px
14mm52.913px165px
15mm56.693px177px
16mm60.472px189px
18mm68.031px213px
20mm75.591px236px
22mm83.15px260px
24mm90.709px283px
25mm94.488px295px
30mm113.386px354px
32mm120.945px378px
34mm128.504px402px
35mm132.283px413px
38mm143.622px449px
40mm151.181px472px
42mm158.74px496px
45mm170.079px531px
48mm181.417px567px
50mm188.976px591px
52mm196.535px614px
55mm207.874px650px
60mm226.772px709px
64mm241.89px756px
70mm264.567px827px
72mm272.126px850px
75mm283.465px886px
78mm294.803px921px
80mm302.362px945px
82mm309.921px969px
85mm321.26px1004px
88mm332.598px1039px
90mm340.157px1063px
92mm347.717px1087px
95mm359.055px1122px
100mm377.953px1181px

Passport & Visa Photo Sizes in Pixels

Photo rules ask for a size in millimeters, but online forms and photo apps work in pixels. Print shops and most official upload portals expect at least 300 DPI. Always check the exact rules for your application.

Photo size 96 DPI (screen) 300 DPI (print) 600 DPI (high quality) Commonly used for
35 × 45 mm132 × 170413 × 531827 × 1063UK, Schengen (EU), Australia and many other passports and visas
33 × 48 mm125 × 181390 × 567780 × 1134China visa
51 × 51 mm (2 × 2 in)192 × 192600 × 6001200 × 1200US passport and visa

Does the form also limit the file size, such as 20 KB or 50 KB? Use our Image Resizer to shrink a photo to an exact size in KB.

Paper Sizes in Pixels (A4, A3, A5, Letter)

Width × height in pixels at the most common resolutions. 72 and 96 DPI suit screens; 150 DPI is draft print and 300 DPI is print quality.

Paper 72 DPI 96 DPI 150 DPI 300 DPI
A5 (148 × 210 mm)420 × 595559 × 794874 × 12401748 × 2480
A4 (210 × 297 mm)595 × 842794 × 11231240 × 17542480 × 3508
A3 (297 × 420 mm)842 × 11911123 × 15871754 × 24803508 × 4961
Letter (8.5 × 11 in)612 × 792816 × 10561275 × 16502550 × 3300

How to Convert MM to PX

A pixel has no fixed physical size, so you need a resolution in DPI (dots per inch). Since one inch is exactly 25.4 mm, the formula is:
px = mm × DPI ÷ 25.4

At the 96 DPI standard this becomes px = mm × 3.7795. For example, 35 mm × 96 ÷ 25.4 = 132.28 px. At 300 DPI the same 35 mm is 35 × 300 ÷ 25.4 = 413.39 px, which rounds to 413 px.

Which DPI Should You Use?

  • 96 DPI — websites and CSS. Browsers define 1 inch as 96 CSS pixels on every device, so 96 DPI gives the size an element will have in your stylesheet.
  • 72 DPI — older screen graphics. Still the default for some design apps; 1 mm is about 2.83 px.
  • 150 DPI — drafts and office printing. Good enough for documents that are read, not inspected closely.
  • 300 DPI — print quality. The standard for photos, passport pictures, posters and professional printing.

A high-resolution phone or "Retina" display packs more physical pixels into each CSS pixel, but that doesn't change the CSS result: 10 mm is still 37.8 CSS pixels. Want to know more? Read DPI vs PPI: What's the Difference and Why It Matters.

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Frequently Asked Questions (FAQs)

How many pixels is 1 mm?

At the standard 96 DPI used by web browsers, 1 mm = 3.78 px (about 3.78 px). At 300 DPI, used for printing, 1 mm = 11.81 px.

How many pixels is 35 mm?

35 mm = 132.28 px at 96 DPI and 413 px at 300 DPI. 35 mm is the width of a standard 35 × 45 mm passport photo.

What is a 35 × 45 mm passport photo in pixels?

At 300 DPI a 35 × 45 mm photo is 413 × 531 pixels; at 600 DPI it is 827 × 1063 pixels. On screen, at 96 DPI, it is 132 × 170 pixels.

What is A4 size in pixels?

A4 (210 × 297 mm) is 794 × 1123 px at 96 DPI and 2480 × 3508 px at 300 DPI, the usual size for print-quality A4 documents.

Which DPI should I use?

Use 96 DPI for websites, CSS and on-screen designs — browsers always treat 1 inch as 96 CSS pixels. Use 300 DPI for anything that will be printed, such as photos, posters and documents.

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.