Conversion Form

MM
PX

About the Unit

Millimeter (mm): The millimeter (mm) is a physical unit of measurement, 1/10th of a centimeter. Like cm, mm is commonly used in graphic design and printing, where precise physical measurements are needed. In CSS, mm is useful for defining width, height, and other dimensions of elements in layouts that will be printed or converted to other physical formats. Using mm is an effective way to ensure precise and consistent layout dimensions during the printing process. For digital designs, the mm unit may be less practical, as most web interfaces benefit more from relative units to ensure a more adaptive user experience. However, for technical documents or precision graphics, mm may be the best choice.

Pro Tip: mm → px

1mm = 3.779px. Convert mm to px for screen-based designs.

Quick Reference: Unit Conversion by Tens

MMPX
10mm37.795276px
20mm75.590551px
30mm113.385827px
40mm151.181102px
50mm188.976378px
60mm226.771654px
70mm264.566929px
80mm302.362205px
90mm340.15748px
100mm377.952756px
110mm415.748031px
120mm453.543307px
130mm491.338583px
140mm529.133858px
150mm566.929134px
160mm604.724409px
170mm642.519685px
180mm680.314961px
190mm718.110236px
200mm755.905512px
210mm793.700787px
220mm831.496063px
230mm869.291339px
240mm907.086614px
250mm944.88189px

Live Unit Preview

See how different CSS units affect the size of the box below:

10px

10rem

10em

10%

10vw

10vh

Common Mistake

Be cautious when mixing mm and px without testing on different screen sizes.

Real Code Example

/* Mobile-first card with mm → px */
.card {
  padding: 0mm;     /* undefinedpx */
  font-size: 1.5rem;
  width: min(90vw, 40ch);
}
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Keyboard Shortcuts

  • Ctrl + C: Convert
  • Ctrl + I: Invert units
  • Esc: Reset values

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