A few thoughts: 1) You could use Relative and/or Absolute valuation. IMO, the easier would be relative since it's difficult to pin down a future growth rate.

A few thoughts: 1) You could use Relative and/or Absolute valuation. IMO, the easier would be relative since it's difficult to pin down a future growth rate. For relative, find some companies which you might be able to compare against, similar business model/size, growth trajectory, and that has raised $$. 2) There is no guaranteed method to predict the future and it depends on what you need the estimate for and, again, would try to find a comparative company to use as a guide for growth rate.