Here is how to convert 42.1 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 42.1 as a fraction is 421/10. Therefore, to get the fractional answer to 42.1 mm in inches, we multiply 421/10 by 5/127 and simplify if necessary.
cm × 5/127 = inches
421/10 × 5/127 = inches
421/10 × 5/127 = 1 167/254
421/10 mm = 1 167/254 inches
42.1 mm = 1 167/254 inches
As promised above, we also have the answer to 42.1 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
1 167/254 ≈ 1.65748031496063
1 167/254 ≈ 1.65748
42.1 mm ≈ 1.65748 inches
Our image below shows 42.1 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 42.1 mm and 1.65748 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
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