I have a lot of diapers already, but my goal is to have 3,000 on hand by the time the baby gets here. I'm almost 1/3 of the way there. I am estimating going through 10 diapers a day over the course of a year. I'm sure there will be more or less here or there, but I am just averaging. Of course I have to have a control-freak spreadsheet to track them all!