Universal Unit Converter Keifa Engineering Tools
Length & Distance

Inch to Millimeter Converter

Convert Inch to Millimeter with the exact formula, a worked example and a quick conversion table.

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Examples:2500 meters to kilometers50 psi to bar100 fahrenheit to celsius
Reverse conversion: Millimeter to Inch

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Quick values:
Conversion formula

The exact formula applied:

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Conversion formula

mm = in Γ— 25.4

in = mm Γ· 25.4

Worked example

1 in = 25.4 mm

mm = in Γ— 25.4

Length units describe structural dimensions and distances; note that a foot is exactly 0.3048 m and an inch exactly 25.4 mm.

Quick conversion table

Inch (in)Millimeter (mm)
0.0010.0254
0.010.254
0.12.54
125.4
10254
1002,540
1,00025,400

Reverse conversion table

Millimeter (mm)Inch (in)
0.0010.0000393701
0.010.0003937008
0.10.003937
10.0393701
100.3937008
1003.93701
1,00039.37008

About the two units

inInch

The international inch equals exactly 25.4 millimetres.

1 in = 0.0254 m

Non-SI Unit Length & Distance

mmMillimeter

One thousandth of a metre, common in technical drawings.

1 mm = 0.001 m

SI Derived Unit Length & Distance

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Related conversions

Inch β†’ CentimeterMeter β†’ MillimeterMeter β†’ KilometerMeter β†’ FootMeter β†’ InchMeter β†’ CentimeterMeter β†’ MileKilometer β†’ MileFoot β†’ InchFoot β†’ CentimeterNautical Mile β†’ Kilometer

Common engineering conversions

Megapascal ↔ Pound per Square InchMegapascal ↔ BarKilogram-force per square centimetre ↔ MegapascalPound per Square Inch ↔ BarMPa = N/mmΒ² (identical)Kilonewton ↔ NewtonKilonewton ↔ Kilogram-forceCubic Meter ↔ Cubic FootSquare Meter ↔ Square FootKilogram per Cubic Meter ↔ Pound per Cubic FootMillimeter ↔ InchCentimeter ↔ InchMeter ↔ FootNewton-metre ↔ Pound-force-footCubic Meter per Second ↔ Cubic Meter per Hour

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Conversion history