Important Note : This calculator estimates simple ROI from cost and returned amount. It is not investment advice and does not replace full performance analysis such as annualized return, IRR, NPV, tax-adjusted return, or risk-adjusted return.

Use this ROI (Return on Investment) Calculator to calculate return on investment, profit, ROI percentage, ROI ratio, invested amount, or returned amount. Enter any two values, such as investment cost and returned amount, and the calculator estimates the missing value with a clear step-by-step result.

Reviewed by: AjaxCalculators Editorial Team
Last updated: April 26, 2026
Method source: Standard return on investment formula using investment gain divided by investment cost
Editorial standards: AjaxCalculators Editorial Policy

What This ROI (Return on Investment) Calculator Calculates

This calculator estimates:

• ROI percentage
• ROI ratio
• Profit
• Invested amount when returned amount and ROI are known
• Returned amount when invested amount and ROI are known
• Step-by-step ROI derivation

The live tool lets you enter any two of the following: invested amount, returned amount, or ROI %. The third value updates from the core ROI relationship. It also supports multiple currency symbols and amount scales such as units, thousands, millions, and billions.

How the ROI (Return on Investment) Calculator Works

1) ROI Formula

Return on investment compares the profit from an investment with the original cost of that investment.

ROI = (Gain − Cost) ÷ Cost

To express ROI as a percentage:

ROI % = (Gain − Cost) ÷ Cost × 100

In this formula:

• Gain means the returned amount or ending value.
• Cost means the invested amount or starting value.
• Gain − Cost is the profit or loss.

2) Profit Formula

Profit is the difference between the returned amount and the original investment cost.

Profit = Gain − Cost

If profit is positive, the investment gained value. If profit is negative, the investment lost value.

3) ROI Ratio

The ROI ratio is the decimal form of ROI before converting it into a percentage.

ROI ratio = Profit ÷ Cost

For example, an ROI ratio of 0.25 equals an ROI of 25%.

4) Returned Amount Formula

If you know the invested amount and ROI, the returned amount can be calculated by rearranging the ROI formula.

Gain = Cost × (1 + ROI)

When ROI is entered as a percentage, it must first be converted to a decimal. For example, 20% becomes 0.20.

5) Invested Amount Formula

If you know the returned amount and ROI, the original invested amount can be estimated as:

Cost = Gain ÷ (1 + ROI)

This rearrangement only works when ROI is greater than -100%, because an ROI of -100% means the entire original investment was lost.

What ROI Means

ROI stands for return on investment. It shows how much profit or loss was generated compared with the amount originally invested.

A positive ROI means the returned amount is greater than the invested amount. A negative ROI means the returned amount is lower than the invested amount. An ROI of 0% means the returned amount equals the original cost, so there is no gain or loss before considering other costs.

Assumptions and Important Notes

• This calculator uses a simple ROI formula.
• It assumes the invested amount is the cost basis used for comparison.
• It assumes the returned amount is the ending value, sale value, or total value received.
• It does not automatically include taxes, brokerage fees, inflation, financing costs, maintenance costs, or other expenses unless you include them in the entered values.
• It does not measure risk-adjusted return.
• It does not calculate annualized ROI unless you separately adjust for time.
• It does not replace IRR, NPV, CAGR, or full portfolio-performance analysis.

Worked Example

Suppose you invest $1,000 and later receive $1,250.

Step 1: Find profit
Profit = 1,250 − 1,000 = $250

Step 2: Divide profit by cost
ROI ratio = 250 ÷ 1,000 = 0.25

Step 3: Convert to a percentage
ROI % = 0.25 × 100 = 25%

So, the investment made a $250 profit and produced a 25% ROI.

Worked Example: Find Returned Amount From ROI

Suppose you invested $5,000 and want a 12% ROI.

Step 1: Convert ROI to decimal
12% = 0.12

Step 2: Use the gain formula
Gain = Cost × (1 + ROI)
Gain = 5,000 × (1 + 0.12)
Gain = 5,000 × 1.12 = $5,600

To earn a 12% ROI, the returned amount would need to be $5,600, before any extra costs, taxes, or fees.

How to Use This ROI (Return on Investment) Calculator

1. Select the currency symbol you want to display.
2. Choose the amount scale, such as units, thousands, millions, or billions.
3. Enter any two values: invested amount, returned amount, or ROI percentage.
4. Let the calculator solve the missing value.
5. Review the profit, ROI percentage, ROI ratio, quick summary, and step-by-step derivation.
6. Use the PDF export option if you want to save the calculation summary.

How to Interpret the Result

Invested amount is the original cost or starting value.

Returned amount is the ending value, sale value, or total value received.

Profit is the difference between returned amount and invested amount.

ROI percentage shows the profit or loss relative to the original investment.

ROI ratio is the decimal version of ROI. For example, 0.10 equals 10%, 0.50 equals 50%, and -0.20 equals -20%.

A higher ROI may look better, but ROI should be compared carefully. A 20% return over one month is not the same as a 20% return over five years. Time period, risk, taxes, fees, and cash-flow timing can change the real meaning of the result.

Simple ROI vs Annualized Return

This calculator focuses on simple ROI. Simple ROI tells you the total return over the whole investment period, but it does not automatically adjust for how long the investment was held.

For example, a 30% ROI over six months is very different from a 30% ROI over ten years. When comparing investments with different holding periods, annualized return, CAGR, IRR, or another time-aware measure may be more useful.

Practical Uses of an ROI (Return on Investment) Calculator

• estimate investment profit or loss
• compare simple returns from different opportunities
• calculate ROI from cost and returned amount
• find the required returned amount for a target ROI
• estimate the original cost from return and ROI
• check business project profitability
• review marketing, stock, property, or small-business investment outcomes

Common Mistakes to Avoid

• Do not compare ROI values from different time periods without considering annualized return.
• Do not ignore fees, taxes, and transaction costs if they materially affect the investment.
• Do not assume a high ROI means low risk.
• Do not use simple ROI as the only metric for complex investments with multiple cash flows.
• Do not confuse returned amount with profit. Returned amount includes the original investment value, while profit is the gain above cost.
• Do not treat this result as financial advice or a guarantee of future performance.

ROI Formula Summary

References

1. AjaxCalculators live ROI Calculator
2. Investopedia: Return on Investment definition, formula, and limitations
3. Corporate Finance Institute: ROI formula and annualized ROI notes

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Disclaimer: This calculator is for educational and planning use only. It estimates simple ROI from the values entered and does not provide investment, tax, accounting, legal, or financial advice. Actual investment performance can be affected by taxes, fees, inflation, risk, leverage, timing, liquidity, and changing market conditions. For investment decisions, consider speaking with a qualified financial professional.