Excel Product Function

What this does

PRODUCT multiplies its arguments together, and does for multiplication what SUM does for addition: it survives inserted rows, ignores blanks and text instead of erroring on them, and stays readable across a long range. The blank-tolerance is the important part — a chain of asterisks breaks the moment one cell holds text, while PRODUCT skips it. Its classic use is compounding a series of growth or retention factors, where multiplying the periods together is exactly the calculation. The same idea underpins a lot of everyday Excel work, so the few minutes spent getting it right here pay back across every sheet you build afterwards. Treat it as a pattern, not a one-off, and it stops being something you look up and starts being something you reach for. The difference between a quick fix and a sheet you can trust is the extra minute you spend validating “excel product function”. Start on a copy or a tiny sample, keep the affected formula visible, and compare the result with the outcome you expected before you touch the real workbook. When a formula is involved, keep the inputs labelled beside it, reference cells instead of typing values, and apply number formatting only after the result checks out. The point is a calculation you can defend to a CFO or an auditor, but the practical win is that someone else can open the file and understand what happened without asking you.

A worked example

Compounding four quarterly growth factors in A2:A5 (1.04, 1.02, 0.99, 1.06): =PRODUCT(A2:A5) returns about 1.1128, an 11.28 % gain over the year. Volume of a box from three dimension cells: =PRODUCT(B2:D2). Applying two successive discounts: =PRODUCT(1-0.15, 1-0.10) returns 0.765. PRODUCT is the multiplication counterpart to SUM, and the only clean way to compound a column of factors without a fragile chain of asterisks. Check the referenced cells, argument order and result type in your workbook. Start with the worked example before changing an input, then compare the changed result with the calculation you expected. An error value or a result of a different type is a reason to inspect the inputs and arguments.

In Google Sheets

Google Sheets support for this task has not been verified. Check the function, arguments and workflow in the target product before transferring the example. Matching formula notation does not establish identical behaviour. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. For “excel product function”, keep the input cells and the result visible while you check the formula in Excel. Follow the worked example and change one input at a time. The steps explain the workbook calculation; this page does not run a live calculator for that task.

Common mistakes

• Including a zero in the range, which makes the whole product zero — filter or guard against blanks-entered-as-zero.
• Confusing PRODUCT with SUMPRODUCT: PRODUCT multiplies everything together into one number, SUMPRODUCT multiplies arrays element by element and then adds the results.
• Assuming text in the range errors; PRODUCT ignores it, which can silently exclude a value you thought was counted.

Frequently asked questions