Here is how to convert 521 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 521 as a fraction is 521/1. Therefore, to get the fractional answer to 521 mm in inches, we multiply 521/1 by 5/127 and simplify if necessary.
cm × 5/127 = inches
521/1 × 5/127 = inches
521/1 × 5/127 = 20 65/127
521/1 mm = 20 65/127 inches
521 mm = 20 65/127 inches
As promised above, we also have the answer to 521 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
20 65/127 ≈ 20.511811023622
20 65/127 ≈ 20.51181
521 mm ≈ 20.51181 inches
Our image below shows 521 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 521 mm and 20.51181 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
What is 521.1 mm in inches?
Here is another inches to millimeters calculation that we have done for you.