There are several domain name brokerage sites. You could take a look at similar domain names to get a rough idea. Perhaps you could even list your domain name o

There are several domain name brokerage sites. You could take a look at similar domain names to get a rough idea. Perhaps you could even list your domain name on one or more of them. As a rough rule of thumb, the shorter the name the higher the price. .com sites tend to be worth more than the rest.