Here is how to convert 18 mm to inches. We will give you the fractional answer, the decimal answer, and illustrate the answer on our tape measure.
One millimeter is equal to 5/127 inches, and 18 as a fraction is 18/1. Therefore, to get the fractional answer to 18 mm in inches, we multiply 18/1 by 5/127 and simplify if necessary.
cm × 5/127 = inches
18/1 × 5/127 = inches
18/1 × 5/127 = 90/127
18/1 mm = 90/127 inches
18 mm = 90/127 inches
As promised above, we also have the answer to 18 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
90/127 ≈ 0.708661417322835
90/127 ≈ 0.70866
18 mm ≈ 0.70866 inches
Our image below shows 18 mm on a tape measure. The top row of the tape measure is inches, and each mark on the bottom row is 1 millimeter (10 millimeter marks equal 1 centimeter).
As you can see, we drew a red line where 18 mm and 0.70866 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
What is 18.1 mm in inches?
Here is another inches to millimeters calculation that we have done for you.