Conversion Form

MM
VW

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 → vw

Convert mm to vw for layout widths, mm is for print measurements.

Quick Reference: Unit Conversion by Tens

MMVW
10mm1.968504vw
20mm3.937008vw
30mm5.905512vw
40mm7.874016vw
50mm9.84252vw
60mm11.811024vw
70mm13.779528vw
80mm15.748031vw
90mm17.716535vw
100mm19.685039vw
110mm21.653543vw
120mm23.622047vw
130mm25.590551vw
140mm27.559055vw
150mm29.527559vw
160mm31.496063vw
170mm33.464567vw
180mm35.433071vw
190mm37.401575vw
200mm39.370079vw
210mm41.338583vw
220mm43.307087vw
230mm45.275591vw
240mm47.244094vw
250mm49.212598vw

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 vw without testing on different screen sizes.

Real Code Example

/* Mobile-first card with mm → vw */
.card {
  padding: 0mm;     /* undefinedvw */
  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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