REM to MM Converter

Convert REM units to Millimeters (MM) for precision.

25.4mm

About REM to MM Converter

The REM to MM converter provides precision metric measurements for technical design, engineering documentation, and detailed print work requiring millimeter-level accuracy. This converter uses the root font size and the CSS standard where 1 inch equals 96 pixels and 25.4 millimeters to calculate exact millimeter values from REM units.

Formula

MM = (REM × Root Font Size) ÷ 3.7795

Examples

2rem (16px root) = 8.467mm
1rem (16px root) = 4.233mm
6rem (16px root) = 25.4mm (1 inch)

Reference

  • • 1 inch = 25.4 millimeters
  • • 1 centimeter = 10 millimeters
  • • Precision unit for technical drawings
  • • Exact CSS conversion: 96px = 25.4mm

Frequency Asked Questions

How many REM equal 1mm?

Approx 0.236rem at 16px root.

How to convert 3rem to mm?

3rem = 12.7mm at standard size.

When to use MM?

Technical specs, fine print details.

Is this accurate for print?

Yes, mathematically exact per CSS spec.