What is 18 millimeters to inches? The answer is that 18 mm equals 0.7086 inches.
How to convert 18 mm to inches? We know that one inch is equal to 25.4 millimeters, so to convert 18 millimeters to inches, we must divide the amount of centimeters by 25.4, which means that 18 millimeters is equal to 18 mm ÷ 25.4 = 0.7086 inches.
See also: How to convert 18 inches to mm.