To convert 1.63 inch to millimeter, multiply by the precise conversion factor of 25.400000. The calculation is 1.63 × 25.400000 = 41.4020 millimeter.

1.63 inch equals exactly 41.402000 millimeter. For practical purposes and precision engineering, this value is typically used as 41.4020 millimeter.

Objects measuring approximately 1.63 inch include the 40mm case diameter of an Apple Watch SE (1.57 inch), the diameter of a golf ball (1.68 inch), and the length of a AAA battery (1.75 inch).

Converting inch to millimeter is crucial for international compatibility in manufacturing, engineering, and scientific research. It ensures precision in designs, facilitates global trade, and aligns with the metric system, which is the standard in most countries.

To remember the 1.63 inch to millimeter conversion, visualize objects like a golf ball (1.68 inch) or a AAA battery (1.75 inch) as close references. Mentally, you can approximate 1.63 inch as slightly more than 1.5 inches, which is about 38.1 mm, then add a small adjustment.