Here is how to convert 100 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 100 as a fraction is 100/1. Therefore, to get the fractional answer to 100 mm in inches, we multiply 100/1 by 5/127 and simplify if necessary.
cm × 5/127 = inches
100/1 × 5/127 = inches
100/1 × 5/127 = 3 119/127
100/1 mm = 3 119/127 inches
100 mm = 3 119/127 inches
As promised above, we also have the answer to 100 mm in inches in decimal form. Although the fractional answer above is exact, the decimal answer may be rounded if necessary:
3 119/127 ≈ 3.93700787401575
3 119/127 ≈ 3.93701
100 mm ≈ 3.93701 inches
Our image below shows 100 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 100 mm and 3.93701 inches meet on the measuring tape.
Millimeters to Inches Calculator
Here you can convert another length in millimeters to inches.
What is 100.1 mm in inches?
Here is another inches to millimeters calculation that we have done for you.