100 millimeters (mm) to inches (in)

100 millimeters = 3.93701 inches

To convert 100 millimeters to inches, divide 100 millimeters by the conversion factor 25.4 (since 1 millimeter equals 1/25.4 inches).

The conversion formula is :
inches = millimeters ÷ 25.4

Here's the calculation to convert 100 mm to in :
100 millimeters ÷ 25.4 = 3.93701 inches

Therefore, 100 millimeters is equal to 3.93701 inches

A millimeter is a unit of length in the International System of Units (SI), equal to one thousandth of a meter. It is abbreviated using the symbol mm (e.g. 100 mm).

An inch is a unit of length in the British imperial and US customary systems of measurement. It is defined as exactly 2.54 centimeters. The inch is abbreviated using the symbols in or " (e.g. 3.93701 in or 3.93701").