The weight of a US quarter coin depends on its year of mintage:
- Quarters minted since 1965 (made of a copper-nickel blend) weigh 5.67 grams.
- Quarters minted between 1873 and 1964 (composed of 90% silver and 10% copper) weigh 6.25 grams.
- Earlier quarters , such as the Draped Bust Quarter and Capped Bust Quarter, had different weights, with the earliest quarters weighing around 6.74 grams.
What coin weighs 5.4 grams?
The nominal weight of a new clad quarter is 5.443 to 5.897 grams. Your coin is well outside that range but without knowing whether it’s damaged, worn, or something else there’s no way to say more.