Note: the FAQ is moving to the Founder's forum. Visit the forums for more in-depth discussions of splitting equity among co-founders.
It sounds like a lot of equity to give away, what if a co-founder leaves?
The equity numbers assume a typical 4-year vesting for all founders including the CEO, with no cliff. It also assumes that no significant salary is provided to any of the co-founders (if that is wrong, you are entering into an employee relationship, not a co-founder relationship). If a founder leaves, vesting applies and they forfeit the shares that have not vested yet.
What does "You have a weak CEO" mean?
Having a "weak CEO" means that your CEO may not be getting their hands dirty enough to make the startup take-off. This typically occurs when the CEO is the "idea person" and expects others (such as the developers) to implement their vision.
What if I have been working on my project for a long time before considering co-founders?
The fact that a founder has been working on the project for significantly longer than others (one year or more) is not justification in itself for more equity. Instead, consider adjusting the vesting schedule.
We are 6 co-founders, can you add more columns to the calculator?
Actually, no. Most startups have one or two co-founders, total. A few have three. Usually, when people ask for 4, 5 6 or more co-founders, it's a sign that someone (the CEO) is not willing to make the hard decisions. Do you really think all 6 potential co-founders are critical to the success of the company? Try to be honest and separate the real co-founders from the friends who are happy to join for the ride.
One of the founders is putting all the money, but there is no place in the calculator to take it into account.
You should treat founders who put significant cash separately. Consider them as co-founders and fill out the questions ignoring the cash contribution. By the way, if most of their contribution is cash, they are not really co-founders, either they are investors who want to tell you how to run your business, or you are their cheap employee. Once you figured out how much equity their work deserves, do projections for a normal round of funding and see how much their cash would be worth.
Great, but how do I find a co-founder?
Read everything about how to find a cofounder here.