What is 25 inches to millimeters? The answer is that 25 inches equals 635 millimeters.
How to convert 25 inches to mm? We know that one inch is equal to 25.4 millimeters, so to convert 25 inches to millimeters, we must multiply the amount of centimeters by 25.4, which means that 25 inches is equal to 25 inches × 25.4 = 635 mm.
See also: How to convert 25 mm to inches.