Millimeters to Inches Converter

Convert metric mm to decimal inches and fractional inches (e.g. 1/16) for carpentry.

Decimal Inches1
Fractional Inches (nearest 1/16)1"

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Precision Measurements

Machinists and engineers often work in millimeters due to their precision. However, American carpenters and contractors use inches, usually broken down into fractions like 1/8 or 1/16.

The Math

Because there are exactly 25.4 millimeters in an inch, you divide mm by 25.4 to get decimal inches. This calculator then automatically rounds that to the nearest 1/16th of an inch for tape measure use.