How to Convert 280 mm to Inches

Many rulers measure in both inches and centimeters. On the centimeter edge of the ruler, the 10 tick marks within each centimeter each represent one millimeter. Since millimeters are a small unit of length, they come in handy for smaller objects that need to be measured precisely. To obtain the equivalent in inches of a measurement in millimeters, perform a single unit conversion.

• 1

  Set up a unit conversion. One inch equals 25.4 millimeters, so the equation for this conversion is 280 mm * 1 in / 25.4 mm.

• 2

  Multiply the numbers with a calculator or by hand.

• 3

  Include the correct units when you write down the result. 280 mm * 1 in / 25.4 mm equals 11 inches -- the "mm" units in the numerator and denominator cancel each other out.