Inches to MM Converter

Enter inches to convert using 25.4 millimeters per inch.

Inches type here

Millimeters or here

Converted value

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Millimeters

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—1 Inches → Millimeters

—1 Millimeters → Inches

LiveTwo-way conversion

All units

Precision, factor & reference table

Display precision

1 Inches = 25.4 Millimeters

Inches	Millimeters
1	25.4
2	50.8
5	127
10	254
20	508
50	1270
100	2540

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Core conversion workflows

Start with a broad dimension converter or jump to the most common metric/imperial pairs. Specialist converters remain available from the full hub.

All 134 converters

Unit ConverterAll-in-one measurement conversion Length ConverterMetric and imperial length units Weight ConverterMass and weight units Temperature ConverterCelsius, Fahrenheit and Kelvin Inches → CMExact 2.54 conversion CM → InchesReverse exact length conversion KG → LBSKilograms to pounds LBS → KGPounds to kilograms °F → °CFahrenheit to Celsius °C → °FCelsius to Fahrenheit Miles → KMMiles to kilometers KM → MilesKilometers to miles

How to use this Inches to MM Converter

Type a value in either Inches or Millimeters. The other field updates immediately, so you can work in either direction without a separate Convert step.

Conversion factor

1 Inches = 25.4 Millimeters. Display rounding changes only what is shown; the declared factor remains the calculation basis.