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.