What is the value of u.s. silver coins?

That is an INCREDIBLY broad question!!

U.S. silver coins were struck in 5 denominations and at 5 mints from the 1790s to the 1960s so there are thousands of possibilities to choose from.

As a rule of thumb most silver coins from the late 1940s to 1964 are worth most for their metal content, about $3 for a quarter, $6 for a half, etc. However other older coins may be worth only that much or may be worth considerably more depending on their date and where they were made.

You can go to a site such as www.Numismedia.com that lists values for all U.S. coins to get an idea of current retail prices.