Conversion Form

MM
IN

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: mmin

1mm = 0.03937in. Convert mm to inches for print-based designs.

Quick Reference: Unit Conversion by Tens

MMIN
10mm0.393701in
20mm0.787402in
30mm1.181102in
40mm1.574803in
50mm1.968504in
60mm2.362205in
70mm2.755906in
80mm3.149606in
90mm3.543307in
100mm3.937008in
110mm4.330709in
120mm4.724409in
130mm5.11811in
140mm5.511811in
150mm5.905512in
160mm6.299213in
170mm6.692913in
180mm7.086614in
190mm7.480315in
200mm7.874016in
210mm8.267717in
220mm8.661417in
230mm9.055118in
240mm9.448819in
250mm9.84252in

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 in without testing on different screen sizes.

Real Code Example

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