Em to Millimeter Converter
Enter a value to instantly convert between typography units.
1 Em = 4.2333 Millimeter
Key Formulas
Point → Pica
pc = pt × 0.0833333Point → Inch
in = pt × 0.0138889Pica → Inch
in = pc × 0.166667Formula
mm = em × 4.233333Ems measure relative font size (1 em = font size; 12pt by default); millimeters are metric fixed units. Converting em to mm is essential for international designers working with metric print standards or when translating responsive web layouts to metric-based specifications.
Source: Adobe PostScript Language Reference & W3C CSS Values
Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
1 em at 12pt = about 4.2 mm—roughly the height of a grain of rice; used for small responsive spacing in web design.
1 em = 4.233 mm
2 em (24pt) ≈ 8.5 mm—common for padding between web elements, translates to about a centimeter.
2 em = 8.467 mm
6 em = 25.4 mm (1 inch exactly). Standard reference point when converting between print and web measurements.
6 em = 25.4 mm
10 em (120pt) ≈ 42.3 mm—heading size in responsive design, nearly 4 centimeters on paper.
10 em = 42.33 mm