How much silver in 40 percent quarter?

A 40 percent silver quarter, often referred to in the context of U.S. coins from the 1965-1970 era, contains 40% silver and 60% copper. Each quarter weighs 6.25 grams, so the silver content is approximately 2.5 grams of silver per coin. In troy ounces, this is about 0.0801 ounces of silver per quarter.