Sooner or later, the Internet comes up with a solution for everything. Enter Coin Jar Calculator, a website that estimates how much the money in your coin jar is worth.
Since different coins have set weights–$10 in quarters weigh half a pound, $4.50 in nickels comes out to a pound, etc.–the site has you weigh different handfuls of coin, compares that to the overall weight of the jar, and comes up with an estimate for you of how much money is likely to be in there.
I don’t know how accurate Coin Jar Calculator is, but it certainly looks easier than counting all those coins. [Lifehacker]