EM to MM Converter

Use this free online em to mm converter tool to convert parent-relative em units to millimeters. Millimeters are an absolute unit used for precise print measurements. This converter translates web typography to precise metric dimensions.

To convert em to millimeters, multiply the em value by the parent font-size to get pixels, then multiply by 25.4 and divide by 96. The default parent font-size is 16px. This provides precise metric measurements for print.

Conversion Formula

mm = (em × parent font-size × 25.4) ÷ 96

For example, to convert 6em to mm with 16px parent font-size, calculate (6 × 16 × 25.4) ÷ 96 = 25.4mm. Similarly, 3em approximately equals 12.7mm because (3 × 16 × 25.4) ÷ 96 ≈ 12.7.

EM to MM Converter Conversion Table (Parent: 16px)

EMMM
0.0625em0.2646mm
0.25em1.058mm
0.5em2.117mm
0.75em3.175mm
1em4.233mm
1.25em5.292mm
1.5em6.35mm
2em8.467mm
2.5em10.58mm
3em12.7mm
4em16.93mm
6em25.4mm
8em33.87mm
10em42.33mm
11em46.57mm
12em50.8mm
13em55.03mm
14em59.27mm
16em67.73mm
20em84.67mm
30em127mm
36em152mm
48em203mm
50em212mm
60em254mm
62em262mm
64em271mm
70em296mm
75em318mm
80em339mm
90em381mm
100em423mm
120em508mm

What is EM?

EM is a relative CSS unit that scales based on the parent element's font size, making it highly context-dependent. By default, 1em equals the parent element's font-size value, creating a cascading effect through nested elements. While EM offers flexibility for component-level scaling, its cascading nature can make it unpredictable compared to REM in complex layouts.

What is MM?

Millimeters (mm) are an absolute CSS unit representing physical millimeters, primarily used for precise print measurements. In web contexts, 1mm equals approximately 3.78 pixels. Millimeters are most useful in print stylesheets and international design contexts where metric precision is required.

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