Convert mm to inches
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Millimeter (mm)
Definition
A millimeter (mm) is a unit of length in the metric system,
equal to 1/1000 of a meter.
It converts to exactly 0.0393701 inches.
History
The millimeter is based on the metric system introduced in France in the late 18th century,
with the meter defined as a universal standard of length.
Use
Commonly used in engineering, manufacturing, and design for precise measurements,
particularly where small dimensions are required.
Inch (in)
Definition
An inch (in) is a unit of length in the US customary
and British imperial systems, defined as exactly 25.4 millimeters.
History
The inch has origins in several ancient cultures and was historically based
on the width of a human thumb. It was standardized internationally in 1959
to exactly 25.4 mm.
Use
Inches are widely used in the United States, Canada, and the United Kingdom
for measuring length in everyday applications such as screens, paper sizes,
and construction materials.