Here is how to convert 138 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 138 as a fraction is 138/1. Therefore, to get the fractional answer to 138 mm in inches, we multiply 138/1 by 5/127 and simplify if necessary.
cm × 5/127 = inches
138/1 × 5/127 = inches
138/1 × 5/127 = 5 55/127
138/1 mm = 5 55/127 inches
138 mm = 5 55/127 inches
As promised above, we also have the answer to 138 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
5 55/127 ≈ 5.43307086614173
5 55/127 ≈ 5.43307
138 mm ≈ 5.43307 inches
Our image below shows 138 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 138 mm and 5.43307 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
What is 138.1 mm in inches?
Here is another inches to millimeters calculation that we have done for you.