ROI calculator
The calculator estimates the percentage gain or loss on an investment using its starting amount, ending value, and holding period.
Enter your figures
- Initial investment: The money committed at the start.
- Final value: The amount received or the investment’s current value.
- Additional expenses: Fees, maintenance, taxes, or other relevant charges.
- Time held: The number of years between the initial investment and final value.
- Calculate: Find the overall return on investment (ROI) and annualized rate.
- Reset: Clear the inputs.
Calculator outputs
- Net return: Final value minus the initial investment and additional expenses.
- Overall ROI: The gain or loss as a percentage of the total amount committed.
- Yearly rate: The compound annual rate implied by the starting and ending amounts.
Use the same currency for every amount and include every material expense attributable to the investment. This calculator provides a planning estimate.
It does not automatically account for taxes, inflation, intermediate cash flows, or changing interest rates.
The result is most useful when you understand what each output measures.
What does the ROI result mean?
The result shows how much value an investment gained or lost relative to its cost.
A positive ROI indicates a gain, while a negative ROI indicates a loss. An ROI of 25% means the net gain equals 25% of the amount invested.
It does not mean the investment earned 25% during each year it was held.
Overall ROI ignores time. Two investments can both produce a 25% gain even if one takes one year and the other takes five years.
An annualized calculation makes that comparison more useful by expressing each result as a compound yearly rate.
A practical interpretation uses three ranges: ROI below 0% represents a loss, ROI at 0% represents no nominal gain or loss, and ROI above 0% represents a nominal gain. These ranges do not determine whether a result is satisfactory.
Risk, inflation, taxes, and available alternatives also affect the decision.
Understanding those outputs leads directly to the calculation method.
What is the return on investment formula?
The return on investment formula divides the net return by the investment cost and expresses the result as a percentage.
Simple ROI formula:
ROI = ((Final value − Investment cost) ÷ Investment cost) × 100
For example, if an investment costs $10,000 and later has a value of $12,500, its ROI is:
ROI = (($12,500 − $10,000) ÷ $10,000) × 100 = 25%
When additional costs apply, add them to the initial investment before calculating the result. If the purchase price is $10,000 and attributable fees are $500, the total invested amount is $10,500.
For a holding period longer than one year, use the annualized ROI formula:
Annualized ROI = ((Final value ÷ Invested amount)^(1 ÷ Years held) − 1) × 100
This calculation uses compound growth. It differs from dividing the overall gain by the number of years because that shortcut ignores compounding.
The formula provides the method, but its assumptions determine how useful the estimate is.
Methodology, assumptions, and limitations
This methodology uses the values entered by the user, standard percentage arithmetic, and compound annual growth for the annualized result.
The calculator combines the initial investment and additional costs into one starting amount. It assumes there are no intermediate deposits, withdrawals, dividends, interest payments, or other cash flows.
When those cash flows occur, internal rate of return (IRR) or net present value (NPV) may provide a more suitable analysis.
Annualized ROI requires a positive starting amount, a positive final value, and a holding period greater than zero. A complete loss, leverage, irregular cash flows, or a negative starting value requires separate treatment.
The calculator does not measure inflation-adjusted return, investment risk, tax consequences, or the opportunity cost of money. Annual percentage rate (APR) is also different: APR generally describes the cost of borrowing, while annualized ROI describes compound investment performance.
Data sources: The result comes only from the values entered. For related compound interest planning and investing research, consult the Investor.gov Compound Interest Calculator and Investor.gov financial tools.
Investor.gov is operated by the U.S. Securities and Exchange Commission (SEC).
Methodology update: August 8, 2026. Figures are rounded to two decimal places.
A worked example makes these assumptions easier to audit.
Worked ROI example
This example shows how a business owner can calculate both overall and annualized ROI for an equipment investment.
Suppose the equipment costs $20,000, installation costs $1,000, and the equipment is worth $27,000 after three years. The total investment basis is $21,000.
Net return = $27,000 − $21,000 = $6,000
ROI = ($6,000 ÷ $21,000) × 100 = 28.57%
The overall ROI is 28.57%. To account for the three-year holding period, calculate the compound yearly rate:
Annualized ROI = (($27,000 ÷ $21,000)^(1 ÷ 3) − 1) × 100 = 8.72%
The estimated annualized return is 8.72% per year. This compound result is lower than 28.57% divided by three because each year’s growth builds on the value accumulated in prior years.
For an auditable business comparison, the owner should also determine whether maintenance costs, cash income, financing interest, or taxes belong in the analysis. The next decision is whether the investment compares favourably with alternatives measured using the same boundaries.
How should you compare investments?
Compare investments using the same ROI definition, expense boundaries, time period, and treatment of cash flows.
Use overall ROI when the investments have equal holding periods. Use annualized ROI when their holding periods differ.
Then consider risk, liquidity, inflation, and tax treatment before deciding where to commit money.
A three-range comparison can classify an alternative as having a lower, similar, or higher ROI, but the percentage alone cannot establish which choice is best. A higher result may involve greater risk, while a lower result may offer better liquidity or more predictable returns.
For content, marketing, equipment, property, or other business projects, define the measurable benefits and costs before applying the formula. Consistent definitions make the comparison more useful and lead to the practical questions below.
ROI calculator FAQs
The following answers clarify the calculator’s accuracy, assumptions, privacy considerations, and appropriate next actions.
Is this ROI calculator accurate?
The calculator is mathematically accurate for the values entered, but the estimate depends on complete inputs. Missing fees, taxes, income, or expenses can materially change the overall ROI and annualized result.
Does ROI include compound interest?
Simple ROI does not model compound interest. Annualized ROI uses a compound calculation to translate the overall result into an equivalent yearly rate, but it does not reproduce irregular interest payments or cash flows.
What is a good ROI?
A good ROI depends on risk, duration, inflation, taxes, liquidity, and available alternatives. Compare options with lower, similar, and higher ROI using consistent assumptions instead of applying one universal threshold.
Is my financial information stored?
This page does not claim storage or privacy protections beyond those implemented by the website. Before entering sensitive investment information, review the website’s published privacy policy.
Do not enter account numbers or personal identifiers.
What should I do after calculating ROI?
After calculating ROI, verify every expense, confirm the holding period, and compare the annualized result with suitable alternatives. For complex investment decisions involving multiple cash flows, consider IRR, NPV, or advice from a qualified financial professional.