The data is a bit tough to deal with via a post, so I've shared it two ways: You can find a PDF with some analysis at: CTO Equity Compensation PDF.

Here’s how you do it in one tweet: @joe I expect this co-founder position to be worth ~30% equity. You’d be amazed by how many startups I coach that tell me they haven’t discussed equity split yet, although they have been coding along for 6 months or more… The longer you wait to have that discussion, the worse it gets.