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Convert millimeters (mm) to decimal inches, fractional inches, or feet and inches for hardware, manufacturing, screen sizes, printing, and construction.
One inch is exactly 25.4 millimeters. The decimal result uses that exact relationship, while the fractional result is rounded to the nearest 1/64 inch for common rulers and practical measurements.
Choose a measurement category and two units, then enter any finite positive or negative value allowed by that measurement. Adjust decimal places when the result needs more detail. Swap Units reverses the direction without discarding the current value.
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