A complete financial model can be built to forecast future revenues, expenses and profits or an investor can rely on the forecast of other analysts and apply various multiples to arrive at a valuation. Some of the more popular ratios are found by dividing the stock price by a key value driver.

Ratio

Price/Book Value
Price/Earnings
Price/Earnings/Growth
Price/Sales
Price/Subscribers
Price/Lines
Price/Page views
Price/Promises Company Type

Oil
Retail
Networking
B2B
ISP or cable company
Telecom
Web site Biotech