What is the value of a 1967 Kennedy half dollar?

Answer 1

From 1965 to 1969 US half dollars were struck in "debased" silver. The outer layer is 80% silver bonded to a core that's .209 silver and and .791 copper, for an overall content of about 40%.

Unless the coin is in uncirculated condition or is from a so-called Special Mint Set, it's basically worth its metal content. Because the price of silver changes daily, the best way to get the retail value of your coin is to multiply the current price of 1 oz. of silver by 0.17

Its diameter is 30.6 millimeters, and its weight is 11.50 grams. Note that from 1965 to 1967, US Coins didn't have mint marks and proof sets weren't made so these topics don't apply to a 1967 half dollar.

Other dates1970 halves were also made of 40% silver but were only sold in special collectors' sets.

All circulation-strike halves dated 1971 and later don't contain any silver at all. They're made of copper-nickel like dimes and quarters. Any that you find in change are only worth 50 cents, regardless of many myths and urban legends to the contrary.
Half dollars made between 1965 and 1970 contain 40% silver, and are currently worth about $5.