It's easy to point all the details that matter in valuing your stock options -- liquidity preferences, strike price, options vs RSUs. The genius stroke here is

It's easy to point all the details that matter in valuing your stock options -- liquidity preferences, strike price, options vs RSUs. The genius stroke here is to focus on the two big details that matter (% ownership and exit value) and focused on that. Caveat: this doesn't work in a "down exit" less than the previous round's value. As @bethcodes says, this is not a calculator, because while these two numbers will get you within a factor of 2, knowing the details will help you get even closer. (Disclosure: I built a calculator to help you do that: http://www.optionvalue.io/calculator/ http://www.optionvalue.io/calculator/)