Question: do all quarters weigh the same?
Answer: All U.S. quarters (25-cent pieces) minted since 1965 weigh 5.670 grams (0.200 ounces). ... The new quarter was to be 6.01 grams (0.211 ounces) pure silver, 6.74 g (0.237 ounces) standard silver. These weights lasted from 1972 until the Coinage Act of 1873.