What is 20 millimeters to inches? The answer is that 20 mm equals 0.7874 inches.
How to convert 20 mm to inches? We know that one inch is equal to 25.4 millimeters, so to convert 20 millimeters to inches, we must divide the amount of centimeters by 25.4, which means that 20 millimeters is equal to 20 mm ÷ 25.4 = 0.7874 inches.
See also: How to convert 20 inches to mm.