Since 1959, the inch has been defined and internationally accepted as being equivalent to 25.4mm (millimetres).
Inches to Meters
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The metre is a unit of length in the metric system, and is the base unit of length in the International System of Units (SI).
As the base unit of length in the SI and other m.k.s. systems (based around metres, kilograms and seconds) the metre is used to help derive other units of measurement such as the newton, for force.