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 tool above 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. If there is any chance you will reuse this, drop it into a small template tab right now: a labelled input area on the left and the formula beside it, checked once against the tool above. Next time the same question comes up, the answer is a single paste away instead of a rebuild from memory.

In Google Sheets

Google Sheets handles this almost identically to Excel. The formula syntax above is the same, and the menu lives under a slightly different label rather than a ribbon tab. Use the platform toggle at the top of the page to switch every keyboard shortcut between Windows and Mac, and expect at most cosmetic differences in naming. 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, the tool proves it, and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. Treat “excel product function” as a small building block rather than a chore. Once the inputs sit in their own cells and the formula reads from them, the same setup answers a dozen related questions with a tweak, and Excel keeps every dependent figure current as the data changes. The tool above is there so you can rehearse and verify before committing anything to a real workbook; the steps and worked example are there so the logic sticks. Get it right once and it stops costing you time — it starts saving it, every time the question comes back around.

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