How much silver is in a 1960 quarter?

20th-century silver coinage was struck in 90% silver / 10% copper, so your coin has (0.90 x 6.25) gm, or 5.625 gm of pure silver. That figure holds true for all Barber, Standing Liberty, and pre-1965 Washington quarters.

At current silver prices you coin is worth about $3.

Updated for Apr 11, 2011

Currently a 1960 coin is worth around $8.77 in silver/copper