ROI Calculator
The ROI Calculator compares an initial investment with a final value to estimate total return on investment and, when a holding period is supplied, an annualized return. It is a simple comparison tool rather than a forecast or investment recommendation.
How to use this calculator
- Enter the initial amount invested or spent.
- Enter the final value or ending amount.
- Optionally enter the investment period in years to estimate an annualized return.
- Review total ROI together with the absolute profit or loss and the assumptions behind the calculation.
ROI formulas
Profit or loss = final value − initial investment; total ROI = ((final value − initial investment) ÷ initial investment) × 100; annualized return = (final value ÷ initial investment)^(1 ÷ years) − 1.
- Total ROI measures the simple gain or loss relative to the original amount.
- The annualized figure converts the total growth into a compound-equivalent yearly rate when a holding period is entered.
- This basic model does not automatically account for intermediate cash flows, taxes, fees, inflation, or different timing of contributions and withdrawals.
Worked examples
20% total ROI
An initial id="root"0,000 amount ends at id="root"2,000.
( id="root"2,000 − id="root"0,000) ÷ id="root"0,000 × 100 = 20%.
The simple total ROI is 20%.
Same result over three years
The same id="root"0,000 grows to id="root"2,000 over 3 years.
( id="root"2,000 ÷ id="root"0,000)^(1/3) − 1 ≈ 6.27%.
The compound-equivalent annualized return is about 6.27%.
Understanding the result
A higher total ROI does not automatically mean a better investment because the time period and risk can be different.
Annualized return is useful for comparing growth over different holding periods, but it is still a simplified representation when cash flows occur during the period.
Important notes
Do not use ROI alone to evaluate an investment decision.
Use consistent currency units and enter a positive initial amount for a meaningful percentage return.
Frequently asked questions
What does ROI measure?
ROI measures gain or loss relative to the initial amount, expressed as a percentage.
Why use annualized return?
It puts growth over a stated holding period onto a yearly compound-equivalent basis for easier comparisons.
Does ROI include fees and taxes?
Not unless those costs are reflected in the ending value or otherwise incorporated into the calculation.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate ROI — Learn the return on investment formula and how to interpret profit, cost, and percentage return.
- APY vs Interest Rate: What Is the Difference? — Understand APY, nominal interest rates, and how compounding changes the effective annual return.
- Return on Investment (ROI) — Understand ROI, the basic ROI formula, and how to interpret a positive or negative return.
ROI calculator use cases
ROI is a percentage measure used to compare a gain or loss with the original cost. This calculator is useful for a quick project, campaign, purchase, or investment-return check when the inputs are already known.
ROI does not by itself capture timing, risk, taxes, financing costs, or the full cash-flow pattern of a longer project. Treat it as a simple comparison metric and check the underlying assumptions before making an important decision.
Read the ROI glossary entry or compare the result with the break-even calculator.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.