It is worth $0.25. Unless it is the 40% percent silver type than it is worth its melt value which is about $1.00.
$11-15
The 1999-S silver proof quarters are about $8.00.
Currently about $5. This price will change as the price of silver goes up or down.
All US nickels (except for silver war nickels) are 75% copper and 25% nickel, with a present melt value of 4.9 cents.
The silver melt value of the dimes are about $2 each and the quarter melt value is about $5.45 so the scrap melt value would be about $11.45.
The silver melt value would be around $2.60.
As of May 24 2011 the melt value of a 1964 quarter is $6.47. This price will change as the price of silver and copper changes. This answer is based upon silver at a spot price of %35.77 per oz and copper at $4 per pound.
Silver prices have been dipping over the last few weeks, so the current melt value of a US silver quarter (minted before 1965) is a little under $6.
Going by melt value alone, one is currently worth about $6.
Unless the quarter is in mint-state or a proof, the value would be the melt value of the silver in the coin which is $3.80ish as of this time of writing, but changes depending on the spot price of silver.
A 1964 Washington silver quarter contains 0.18084 troy ounces of silver. At current market prices, the value of the silver in a single quarter would be around $3.
Going purely by melt value, a U.S. quarter minted before 1965 is currently worth about $5.50 for the silver (as of 11 January 2013).
As of 20 December 2015, one U.S. silver quarter is worth $2.56 in melt value.
Is not a valuable pre 1965 silver quarter. It's worth keeping though as it has a melt value of a around $5.
The melt value, which only takes into account the coin's metal content and not its collector value, is currently about $5.
90%. They have a melt value of around $6. The last year they made them was 1964.