What is the standard size for hoop earrings?

The average or standard size for hoop earrings is 20 to 30 millimeters. At 20 millimeters, hoops are roughly the size of a penny, while 25-millimeter hoops compare to a quarter. Half dollars are around the same size as 30-millimeter hoop earrings. Shop a diverse assortment of hoop earrings on 1stDibs.