The millimeter is a unit of length in the metric system. You can convert millimeters to inches in one of two ways: divide the number of millimeters by 25.4, or multiply the number of millimeters by 0.0394.
Suppose you need to convert 51 millimeters to inches. You can divide 51 by 25.4, which equals approximately 2 inches. Alternatively, you may multiply 51 by 0.0394, which again produces about 2 inches. Depending on the degree of accuracy needed, you may opt to round your answer to different digits. For instance, if you convert 17 millimeters to inches, you obtain a result of about 0.669 inches. You might leave this answer as-is, or round it to 0.67 or even 0.7 inch.
- Photo Credit Rocter/iStock/Getty Images
How to Read a Ruler in Centimeters, Inches & Millimeters
An English ruler provides incremental measurements in inches, with each inch further divided into smaller fractions. A metric ruler provides incremental measurements...
How to Convert mm to Fractional Inches
Converting millimeters (mm) to fractional inches is a matter of rounding to the nearest 16th of an inch, since this is how...
How to Convert Inches to Mm
Working with the metric system sometimes means converting measurements using simple mathematical formulas. Because metric measurements are expressed in units of 10,...
How to Convert Metric to Inches
An inch is ever-present in life, from "not being able to see an inch in front of your face" to "being frightened...
How to Convert From Metric to Feet and Inches
The metric system features quite a few small units of measurement for length; the millimeter, centimeter, decimeter and meter all measure distances...
How to Convert Inches H2O to Mercury
The pressure of a gas can be measured by a simple device called a U-tube manometer. For low pressures, a relatively light...
How to Convert 48 Millimeters to Inches
Millimeters and inches measure length. Millimeters are used in the metric system, while the inch is used in the imperial system. When...
How to Measure in Millimeters, Centimeters & Meters
Most Americans are accustomed to measuring using inches and feet. Nearly the rest of the world, however, measures using the metric system...
How to Convert 3.5 Millimeters to Inches
Meters are the the metric standard of length and are used in most of the world. In the United States, however, the...