What’s your business worth? It’s a good idea to know the value whether you’re nearing retirement (and preparing to sell) or if you’re trying to borrow money from the bank. Now a new Web site from credit card issuer Advanta Corp lets business owners see what similar businesses are worth and get customized estimates of their own value, according to this entry on the Wall Street Journal’s Independent Street Blog.

The site offers free estimates for 10 million U.S. businesses based on info from Google Maps as well as a major business credit bureau. You can also provide more detailed information–like annual revenue, inventory, rent, number of employees, etc.–and received a customized valuation. A good tool to know about for anyone selling—or buying—a small business.