Here is how to convert 421 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 421 as a fraction is 421/1. Therefore, to get the fractional answer to 421 mm in inches, we multiply 421/1 by 5/127 and simplify if necessary.
cm × 5/127 = inches
421/1 × 5/127 = inches
421/1 × 5/127 = 16 73/127
421/1 mm = 16 73/127 inches
421 mm = 16 73/127 inches
As promised above, we also have the answer to 421 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
16 73/127 ≈ 16.5748031496063
16 73/127 ≈ 16.57480
421 mm ≈ 16.57480 inches
Our image below shows 421 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 421 mm and 16.57480 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
What is 421.1 mm in inches?
Here is another inches to millimeters calculation that we have done for you.