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How to calculate money needed for bills, by day
I think you might benefit from adopting a zero-sum budget, in which you plan where each dollar will be spent ahead of time, rather than simply track spending or worry about the next expense. Here's a pretty good article on the subject: How and Why to Use a Zero-Sum Budget. This is the philosophy behind a popular budgeting tool You Need a Budget, I am not advocating the tool, but I am a fan of the idea that a budget is less about tracking spending and more about planning spending. That said, to answer your specific question, one method for tracking your min-needed for upcoming expenses would be to record the date, expense, amount due, and amount paid as shown here:  Then the formula to calculate the min-needed (entered in E1 and copied down) would be: As you populate amounts paid, the MinNeeded is adjusted for all subsequent rows. You could get fancier and only populate the MinNeeded field on dates where an expense is due using IF().