What is the standard measurement for a watch’s diameter?

The standard measurement for a watch's diameter is in millimeters (mm). This choice is widely accepted in the watch industry for several reasons. Firstly, millimeters provide a precise scale for measuring smaller objects such as wristwatches, enabling detailed specifications that can be crucial for design and customer preferences. Given that wristwatches typically range from about 28mm to over 50mm in diameter, millimeters offer an ideal measurement unit that accommodates this range effectively.

Using centimeters would be impractical for watch dimensions, as the sizes would become less precise and could lead to confusion regarding specific measurements. Inches and feet are larger units of measure, which are inappropriate for the fine granularity needed when dealing with the compact size of watches. Therefore, millimeters are the most suitable and commonly used measurement for watch diameters in the industry.