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25.4 mm is equal to one inch.

Effective July 1, 1959, the United States and countries of the British Commonwealth defined the length of the international yard to be exactly 0.9144 meters. Consequently, the international inch is defined to be equal to exactly 25.4 millimeters.

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This is the definition as it exist today, but through the times, from country to country, even from city to city within countries, the defined length of an inch have been varying slightly.

It is also all the varying measure-methods and names that in turn have brought forward the metric system as a unified system of measurement for mostly all over the world.

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14y ago

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