ROI Formula Excel

What this does

ROI expresses profit as a percentage of the money you committed, so a €50 gain on €200 and a €500 gain on €2,000 are revealed as the same 25% return. It is the quickest way to rank options that cost different amounts, because it normalises every result back to "per euro invested". 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 “roi formula excel”. 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

You invest €1,000 in a project and it returns €1,250. Enter =(1250-1000)/1000 and format as a percentage: the ROI is 25%. Net profit is €250. If the return were instead €900, the formula gives -10% — a loss — which the result box flips to red so the sign is unmissable. ROI is the back-of-the-envelope test every budget owner runs first: did this spend earn its keep? Use it to triage projects before a deeper model, then switch to CAGR or NPV when timing and discounting matter. 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 “roi formula excel”, 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

• Forgetting to subtract the original investment, which reports gross return instead of ROI.
• Ignoring fees, taxes or holding time, so two ROIs are not really comparable.
• Mixing time periods — a 25% ROI over five years is not the same as 25% in one year (use CAGR for that).
• Dividing by the return instead of the investment, which understates the figure.

Frequently asked questions