That's a great question! It's a common point of confusion, but the coin featuring President John F. Kennedy is actually a half dollar, not a dollar. The search results you found correctly refer to the Kennedy Half Dollar.
The value of a Kennedy half dollar depends almost entirely on its year and the amount of silver it contains.
The most valuable regular-issue Kennedy half dollars are from 1964. These coins are made of 90% silver, and their worth is primarily based on the current market price of silver. Their value will fluctuate daily but is typically many times their 50-cent face value.
From 1965 to 1970, Kennedy half dollars were made with a 40% silver composition. These are still worth more than their face value due to their silver content, but they are less valuable than the 1964 coins.
After 1970, Kennedy half dollars intended for circulation were made from a copper-nickel alloy and contain no silver. These are generally only worth their face value of 50 cents unless they are in pristine, uncirculated condition or are part of a special collector's set. Some modern proof and special mint sets do contain silver versions, which are valuable to collectors.
In short, to find the value, you first need to check the date. If it's 1964, it's 90% silver. If it's between 1965 and 1970, it's 40% silver. Any other year is likely just worth 50 cents unless it's a special proof or uncirculated coin.
