**Ten millimeters is equal to approximately .39 inches.** Millimeters are a much smaller unit than inches.

If converting from millimeters to inches, multiply millimeters by .03937. It will provide a rough estimate of how many inches the millimeters would equal. To convert inches to millimeters, multiply inches by 25.4. This will provide the equivalent number in millimeters.

Millimeters are a unit of measurement in the metric system. Millimeters are the smallest metric unit of measure. There are 10 millimeters in one centimeter. Other metric system measurements include centimeters and meters. Millimeters may be used when someone needs a very precise measurement of something, such as in architecture or machinery design.