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ROI Calculator: Quickly Measure Your Return on Investment (in %)

The ROI Calculator converts a starting amount and an ending amount into a clear percentage return. Use it to compare opportunities side-by-side, evaluate campaigns or projects, and sanity-check whether results beat your target hurdle rate.

1) What the Calculator Does

This tool computes return on investment (ROI) — the percentage gain or loss relative to the money you originally put in. Enter your Initial Investment and the Final Value; the calculator outputs the ROI%. Positive values indicate a gain, negative values indicate a loss.

2) Inputs

Input Description
Initial Investment The amount you invested at the start (purchase price, setup cost, down payment, etc.).
Final Value The amount you ended with (sale proceeds, current value, or total amount received).
Other Costs (optional) If you’re comparing projects, consider fees, taxes, maintenance, marketing spend, or financing costs when interpreting results.

3) How It Works (Formula)

ROI is calculated using the standard percentage-return formula:

ROI (%) = ((FinalValue − InitialInvestment) / InitialInvestment) × 100

Variables:

  • FinalValue = ending value or proceeds.
  • InitialInvestment = amount originally invested.

Including costs (for fuller comparisons):

ROI (%) = ((FinalValue − (InitialInvestment + TotalCosts)) / (InitialInvestment + TotalCosts)) × 100

Where TotalCosts can include transaction fees, taxes, maintenance, marketing, interest, etc.

4) Outputs

Output What It Means
ROI (%) The percentage gain or loss relative to what you put in. Example: 12% means a $12 gain per $100 invested.
Net Profit/Loss (concept) FinalValue − InitialInvestment. Helpful for interpreting the ROI in dollars.
Breakeven Check ROI = 0% at breakeven. Above 0% = profit; below 0% = loss.

5) Practical Use Cases

  • Compare investments — weigh stocks, funds, or properties on a like-for-like percentage basis.
  • Marketing & projects — evaluate campaign spend vs. revenue generated.
  • Business decisions — check whether a purchase or upgrade cleared your hurdle rate.
  • Flip/trade analysis — measure profitability of reselling goods or crypto/stock trades.
  • Portfolio review — summarize winners/losers over a period.

6) FAQ

What is a “good” ROI?

It depends on risk, timeframe, and alternatives. As a rule of thumb, compare your ROI to your hurdle rate (e.g., expected market return or borrowing cost). If ROI > hurdle rate after fees and taxes, it’s generally attractive.

Does ROI include the time value of money?

No. ROI is a simple percentage and ignores timing. For time-aware analysis, use annualized return (CAGR/IRR) or a compound interest or NPV/IRR tool.

Should I add fees and taxes?

Yes, if you want apples-to-apples comparisons. Adjust your inputs (or interpret results) to reflect commissions, spreads, maintenance, property taxes, marketing costs, or income taxes.

What does a negative ROI mean?

It indicates a loss. For example, an ROI of −10% means you lost $10 per $100 invested.

Can I compare projects of different sizes?

Yes — that’s the strength of ROI. The percentage normalizes results so a $5,000 project and a $500,000 project can be compared fairly.

Try the Calculator

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