Return on Investment Calculator

How to Calculate ROI

Return on Investment (ROI) measures the profitability of an investment as a percentage. It is one of the most widely used financial metrics for comparing the efficiency of different investments and evaluating business decisions.

ROI Formula

ROI expresses the net gain or loss on an investment relative to its cost:

Annualized ROI Formula

Annualized ROI converts a multi-year total return into an equivalent annual rate, making it possible to compare investments held for different periods:

When to Use ROI

ROI is a versatile metric used across many financial decisions:

• Comparing investments — evaluate which opportunity delivers the best percentage return relative to cost
• Evaluating business decisions — assess whether a project, hire, or expansion will generate sufficient returns
• Measuring marketing effectiveness — determine whether campaigns deliver profitable results
• Assessing capital expenditure — justify equipment purchases or infrastructure upgrades

Limitations of ROI

While ROI is a powerful metric, it has important limitations to keep in mind:

• Ignores time — a 50% ROI over 1 year is very different from 50% over 10 years. Use annualized ROI or our payback period calculator to account for time.
• Ignores risk — two investments with identical ROI may carry vastly different risk profiles
• Ignores opportunity cost — ROI does not compare against what the money could have earned elsewhere

ROI for Accountants

Accountants frequently use ROI when advising clients on capital purchases, expansion decisions, and investment opportunities. By calculating ROI for proposed expenditures, you can present clients with a clear, quantifiable measure of expected returns. Pair ROI analysis with payback period calculations for a more complete picture of both profitability and time-to-recovery.