ROI Calculator
Calculate the return on investment for any project or purchase.
Enter values above to see results
How to use this calculator
Enter your assumptions above and review how projected outcomes change as you adjust contribution amount, rate of return, timeline, or withdrawal values. Testing conservative, moderate, and optimistic scenarios can help you understand a realistic range of possible results.
Start by using realistic estimates based on your personal situation. If unsure about expected returns, use historical average returns but recognize that past performance does not guarantee future results. You can experiment with different assumptions by changing one variable at a time and observing how each factor affects your outcome. This helps build intuition for how contributions, time horizon, and rate of return interact.
Assumptions and limitations
Calculator outputs are educational projections, not guarantees. Real outcomes can differ due to market volatility, inflation, taxes, fees, and personal circumstances. Use these estimates as planning support and combine them with broader research before making financial decisions.
This calculator assumes consistent investment behavior, reinvested returns, and doesn't account for withdrawals beyond those specified or emergency changes to your plan. For a personalized financial plan, consult with a qualified financial advisor who can review your complete situation. Our goal is educational—to help you understand the mechanics of compound growth and the impact of key variables on long-term wealth building.
Understand return on investment (ROI)
Return on investment measures gain or loss relative to the amount invested. It is a useful first comparison because it puts outcomes on the same percentage scale, but it should not be the only measure used to compare investments or projects.
ROI is especially helpful when comparing two alternatives with the same cost and time horizon. When time differs, annualised return, cash-flow timing, risk, and liquidity may matter more than a single cumulative percentage.
Formula and inputs
A common formula is ROI = (ending value minus cost) divided by cost, multiplied by 100. If income, dividends, or distributions are part of the outcome, include them consistently in the ending value before comparing alternatives.
Enter the initial cost and final value, including the cash flows that belong in the comparison. Use the same treatment of fees, taxes, and income for every option so that the comparison is fair.
Worked planning example
If an investment costs $10,000 and later has a total value of $12,000 after including relevant income, the gain is $2,000. The simple ROI is 20%. That result does not tell you whether the gain happened in one year or ten years, so add time to the analysis.
| Input or result | Example | What it means |
|---|---|---|
| Initial cost | $10,000 | Amount committed at the start |
| Ending value | $12,000 | Value after the comparison period |
| Gain | $2,000 | Ending value minus initial cost |
| Simple ROI | 20% | Gain divided by initial cost |
| Time period | Record separately | Needed to judge annualised performance |
How to interpret the result
A higher ROI is not automatically the better choice. Check the period, risk taken, cash required, and whether the result includes costs. A lower but repeatable return with appropriate risk can be more useful than a higher one-time percentage.
Limitations to keep in mind
Simple ROI ignores the timing of cash flows and does not annualise the result. It can also obscure risk, taxes, financing costs, and liquidity. Use an annualised measure or a cash-flow model when comparing investments held for different periods.
Use this tool to test assumptions, not to predict a guaranteed outcome. Financial markets, inflation, taxes, fees, account rules, and personal circumstances can change a real-world result. For decisions that depend on your full financial situation, consider speaking with a qualified professional.
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What is ROI (Return on Investment)?
ROI is a simple metric that measures the profitability of an investment. It’s expressed as a percentage and tells you how much you gained or lost relative to your initial investment.
ROI Formula
ROI = ((Amount Returned – Amount Invested) / Amount Invested) x 100
Example
You invested $10,000 in stocks and sold them for $15,000:
- Net Profit: $5,000
- ROI: 50%
When to Use ROI
ROI is useful for comparing different investment opportunities, evaluating business decisions, and measuring the effectiveness of marketing campaigns. However, it doesn’t account for the time period — a 50% ROI over 1 year is much better than 50% over 10 years. For time-adjusted comparison, use our Investment Return Calculator: Test Assumptions Before Buying">Investment Return Calculator: Model a Small Deposit">Investment Return Calculator.
Limitations of ROI
Does not account for time — use annualized return for time-adjusted comparisons
Does not account for risk — higher ROI often comes with higher risk
Does not include opportunity cost — what you could have earned elsewhere
Sources and assumptions
The examples on this page are mathematical illustrations based on the inputs shown. Results are not forecasts or guarantees; fees, taxes, inflation, market changes, timing, and personal circumstances can materially change real outcomes.