Here are some rules of thumb, with SWAG percentages attached. 1) Fulltime hours worked (with no salary) count more than part time hours worked (done in your fr

Here are some rules of thumb, with SWAG percentages attached. 1) Fulltime hours worked (with no salary) count more than part time hours worked (done in your free time from a day job). 2) Having the initial idea counts for 5%. 3) A difficult to replicate beachhead (patent, nontrivial code, brilliant design) counts for 10-20%. 4) Being the person who actually incorporates and recruits others counts for 10%. 5) Money invested is ignored. It should either be even contributions for everyone (and thus nulled out), or invested in a convertible note with very modest terms (and thus counted separately). 6) Holding the CEO role counts for 10%. 7) Having a reputation that will meaningfully impact the company's probability of being funded counts for 2x-4x. 8) If, at the end, you and your cofounders have equal shares, you did it wrong. 9) Once the company has had the validation and de-risking of a financing round, everyone from thenceforth is an employee, not a founder.