There is a better way to handle this than manually carving up hours across a date range, and this reader's question proves it. The request is straightforward: take a product's total hours, its start date, and its finish date, then distribute those hours across the days in between and drop the result into a chart. That is not a niche ask. It is the kind of task that makes people abandon spreadsheets at the exact moment a spreadsheet could save them.
The practical path forward is a formula that divides the assigned hours by the number of days in the range, then maps that daily value to each corresponding date in the chart. The logic is simple: if a product has 40 hours over 10 days, each day gets 4 hours. The formula needs to reference the start and end dates, calculate the span, and return the result only when the chart's date falls within that range. A combination of IF, AND, and date comparisons does this cleanly. No macros. No manual entry. No dragging a single value across a row and hoping it lines up.
What makes this worth pausing on is not the mechanics. It is the mindset. The person asking this question is not lazy. They are looking for a system that matches how work actually happens: tasks overlap, dates shift, and hours rarely sit still. A formula that respects the date range turns a static list into a living schedule. Update the start date, and the distribution recalculates. Change the total hours, and the daily values follow. That is the difference between a chart you maintain and a chart that maintains itself.
The takeaway here is not that spreadsheets are hard. It is that they are forgiving when you ask them the right question. The right question is not "How do I fill this chart?" but "How do I build this chart so it fills itself?" Start with that shift in framing, and the formula becomes a detail. The real win is a workflow that does not punish you for changing your mind. So if you are staring at a column of hours and a pair of dates, do not reach for the calculator. Reach for the formula bar. The answer is already there.