What is 15 inches to millimeters? The answer is that 15 inches equals 381 millimeters.
How to convert 15 inches to mm? We know that one inch is equal to 25.4 millimeters, so to convert 15 inches to millimeters, we must multiply the amount of centimeters by 25.4, which means that 15 inches is equal to 15 inches × 25.4 = 381 mm.
See also: How to convert 15 mm to inches.