To make life easier, you just surf on over to Coinflation.com and check the current metal value based on the spot price.
Now that I know 1 Morgan dollar is worth $35, does that really mean I could sell it to a dealer for that price?
No. Expect anywhere between 85% to 95% (if you're lucky) of that, if it's junk. If you want melt price, you're better off selling it to another collector.
Mexican silver is becoming popular as well. Krispy sent me this site that I have found handy. http://www.wescottfamily.net/silverme.html
Heres the formula for when your on the run. A morgan/peace dollar contains .77 of an ounce of silver per coin. Halfs, Dimes, and Quarters (pre '65) have .715 of an ounce of silver per $1 Face. so if you have a quarter and a dime, you have .35 x .715 x spot
Coinflation has the same melt value calculators as silvercoinstoday for all types of coins. You just have to know how to navigate their site. http://www.coinflation.com/coins/silver_coin_calculator.html
I've seen the silver melt calculator on coinflation before, I like the one on silvercoinstoday because you can do it all at once.