
Here is how to convert 520.1 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 520.1 as a fraction is 5201/10. Therefore, to get the fractional answer to 520.1 mm in inches, we multiply 5201/10 by 5/127 and simplify if necessary.
cm × 5/127 = inches
5201/10 × 5/127 = inches
5201/10 × 5/127 = 20 121/254
5201/10 mm = 20 121/254 inches
520.1 mm = 20 121/254 inches
As promised above, we also have the answer to 520.1 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
20 121/254 ≈ 20.4763779527559
20 121/254 ≈ 20.47638
520.1 mm ≈ 20.47638 inches
Our image below shows 520.1 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 520.1 mm and 20.47638 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
What is 520.2 mm in inches?
Here is another inches to millimeters calculation that we have done for you.