You need to choose a target P/E and go with that, the problem with startups is the lack of a well defined trend in revenues. That said, determine the earnings

You need to choose a target P/E and go with that, the problem with startups is the lack of a well defined trend in revenues. That said, determine the earnings (if you can) and set a P/E of at least 30. Let's say your earnings in 2012 were 1 million, 30 million sounds like a good price for the company, keep in mind that value is a measure of interest or the need for something.