The diameter of a United States silver dollar is approximately 1.5 inches. This dimension is a defining characteristic and distinguishes it from other coinage. This measurement provides a tangible reference point for estimating the dimensions of similarly sized circular objects.
Knowing the diameter is important in numismatics, historical studies, and even practical applications requiring a reference for measurement. This consistent size allowed for easy standardization in commerce and contributed to its recognition and acceptance. The physical attributes of this currency played a role in its economic and cultural significance.