mm to Inches

Convert millimeters to inches instantly — enter any mm value and see the exact inch result with a visual bar comparison

25.4 mm ÷ 25.4 = 1 in

Result in inches

1 in

Millimeters (mm)25.40Inches (in)1

About this calculator

The mm to inches converter uses the exact conversion factor of 25.4 millimeters per inch. Enter any millimeter value to instantly get the precise inch equivalent. Useful for comparing metric and imperial measurements in engineering, woodworking, and everyday sizing.

Common examples

  • 1 mm = 0.039370 in
  • 10 mm = 0.393701 in
  • 25.4 mm = 1.000000 in
  • 100 mm = 3.937008 in
  • 300 mm = 11.811024 in