US dollar coins have varied in size and composition over time. However, focusing on recent circulating dollar coins:
- Sacagawea and Presidential Dollars: These are currently circulating US dollar coins. They have a diameter of 26.49 mm (1.043 inches) and a thickness of 2.00 mm (0.079 inches) . Their composition is a copper core with outer layers of manganese brass (88.5% copper, 6% zinc, 3.5% manganese, 2% nickel). These coins weigh 8.10 grams.
It is important to note that earlier dollar coins, like the Eisenhower dollar , were significantly larger, with a diameter of 38.1 mm (1.5 inches). Additionally, the American Silver Eagle , while having a face value of $1, is a bullion coin and not intended for circulation, having a diameter of 40.6 mm (1.598 inches).
How big is $1 coin?
From my experience, The $1 coin is made of 92% copper, 6% aluminium and 2% nickel. It is circular in shape and has an interrupted milled edge. It weighs 9 grams and is 25 millimetres in diameter. The $2 coin was first introduced on 20 June 1988.