The value of a silver quarter depends on several factors, including its silver content, rarity, condition, and collector demand.
For U.S. quarters minted before 1965, they contain 90% silver and 10% copper. These quarters are commonly referred to as "silver quarters." The value of a silver quarter is primarily determined by the current price of silver on the market.
As of my last update in January 2022, the approximate silver value of a pre-1965 silver quarter (containing approximately 0.1808 troy ounces of silver) would be based on the prevailing price of silver. You can calculate the approximate value by multiplying the silver content by the current spot price of silver per ounce.
However, keep in mind that collectors may be willing to pay more than the silver value for certain coins based on their rarity, condition, and historical significance. It's recommended to consult with a reputable coin dealer or numismatist to determine the specific value of your silver quarter.