U.S. coinage is manufactured to very precise standards, and, even allowing for wear, make very good weight/mass standards when you need to calibrate scales to within about ±1.5%. Here are the official weights. Per scientific methods, three decimal places of precision for U.S. coins implies an accuracy of at least ±5e-4 g (±5e-3 g for Euro coins), but that does not jive with Mint's claim. | Penny* | 2.500 g | | Nickel | 5.000 g | | Dime | 2.268 g | | Quarter | 5.670 g | | 50 € cent | 7.80 g | | 10 € cent | 4.10 g | | 5 € cent | 3.92 g | | 1 € cent | 2.27 g |
Official weights for other country's coins could not be located * A penny is 0.750" (¾") Ø. |