How much silver is in a US quarter?

Answer 1

If it's dated 1965 or later, none. ALL current circulating quarters (as well as dimes and halves) are made of clad copper-nickel. Their composition is 91.67% copper and 8.33% Ni

If it's dated 1964 or earlier, about 5.6 gm depending on the date. These were made of 90% silver and 10% copper.

Answer 2

5.625 gm

Silver quarters dated 1964 and earlier weighed 6.25 gm and were made of 90% silver and 10% copper.

ALL circulating quarters dated 1965 and later (as well as dimes) are made of clad copper-nickel. Their composition is 91.67% copper and 8.33% Ni

Halves made since 1971 and dollars made from 1971 to 1999 are made of the same material, while dollars made since 2000 are brass.