Junk silver by face value
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Assumes mixed 90% silver dimes, quarters and halves (1964 and earlier): 0.7234 troy oz of silver per $1 face. Dealers often use 0.715 to allow for wear.
Custom calculator
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Coin value (PCGS)
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Values from the PCGS Price Guide. Pick a coin (or type its PCGS #) to see prices across key grades, starting with the lowest grade PCGS prices; a grade you enter is added and highlighted. A cert number looks up one graded coin. PCGS allows 1,000 calls a day and a scale takes about 15, so results are cached for a week.