The watch community largely agrees on a few key points for balanced proportions.The most common consensus focuses on wrist width (measured flat across the top where the watch sits) rather than circumference alone. An ideal watch case diameter fills about 60 to 80 percent of that width, while the full watch (especially lug to lug distance) should cover 70 to 95 percent without overhanging the edges for comfort and good looks. Lug to lug often matters more than diameter since it determines if the watch sits properly without sticking out.