EM to Millimeter Converter

Convert EM to millimeters, suitable for responsive web design

What are EM and Millimeters?

EM is a relative unit based on the font size of the parent element. Millimeters are an absolute unit typically used for physical measurements.

Usage Instructions

  1. Set the parent element's font size (default is 16px)
  2. Input the EM value to convert
  3. Click the "Convert" button or press Enter to get the result
  4. Use the "Copy" button to copy the conversion result
px
em
0 mm

Calculation formula: mm = (em × parent element font size) ÷ 3.7795

Common Conversion Examples

  • 1em = 4.23mm (when the parent element's font size is 16px)
  • 2em = 8.46mm
  • 0.5em = 2.11mm
  • 1.5em = 6.35mm