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Convert inches to millimeters or vice versa with ease—perfect for DIY projects, technical drawings, or everyday measuring tasks!
An inch (in) is an imperial unit equal to 25.4 millimeters. A millimeter (mm) is a metric unit, one-thousandth of a meter, used for precision.
The inch evolved from ancient English units, standardized in the 14th century. The millimeter emerged with the metric system in France during the 1790s.
Inches are prevalent in the US for construction and tools. Millimeters are standard in science, manufacturing, and most countries for fine measurements.
Multiply inches by 25.4 to get millimeters. For example, 2 inches × 25.4 = 50.8 mm.
Yes, it uses the exact standard of 1 inch = 25.4 mm for reliable results.
Sure! Use the toggle button to switch from inches to mm or mm to inches.