The dime is the smallest in diameter and is the thinnest of all U.S. coins currently minted for circulation, being 0.705 inches (17.91 millimeters) in diameter and 0.053 in (1.35 mm) in thickness. ... Dime (United States coin) Value0.10 U.S. dollar Mass2.268 g (0.0729 troy oz) Diameter17.91 mm (0.705 in) Thickness1.35 mm (0.053 in) Obverse 14 more rows