mm to in Converter

Convert millimeters to inches precisely. 1 inch = 25.4 millimeters (exact).

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Length Converter

Convert length units instantly

1 mm = 0.0393701 in
Live conversion result
How it works

Base unit: m. Values convert via the base unit for this category.

Formula (scale-only): in = mm × 0.0393701
That is, multiply by 0.0393701 to convert mm to in.
Examples
  • 1 mm = 0.0393701 in
  • 5 mm = 0.19685 in
Tips
  • 1 inch is exactly 2.54 centimeters (defined since 1959).
  • The international foot is exactly 0.3048 meters.

Popular conversions

mmin
10.0393701
50.19685
100.393701
1003.93701

Examples

  • 10 mm = 0.393701 in
  • 100 mm = 3.93701 in

How to convert

in = mm × 0.0393701. Multiply the value in mm by 0.0393701 to get in.

Related conversions

cm to inchesinches to cmmeters to feetfeet to metersinches to mmkm to miles

FAQs

  • How many inches are in 1 mm?

    0.03937007874 inches (1/25.4).

  • Formula for mm to inches?

    inches = millimeters ÷ 25.4.

  • Is 25.4 mm exact?

    Yes, 1 inch is exactly 25.4 mm.