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ROI Calculator

Calculate return on investment — net gain, ROI percentage, and annualized return.

Initial Investment ($)

Final Value ($)

Investment Period

Period Unit

About ROI Calculator

ROI Calculator is a free online tool that helps you calculate return on investment — net gain, roi percentage, and annualized return quickly and accurately. Whether you're a student, professional, or just need a quick answer, this calculator provides instant results with clear explanations. All calculations run locally in your browser — no data is stored or transmitted.

How to Use

Enter your values Fill in the required input fields with your numbers. Use tab to move between fields quickly.

See instant results Results calculate automatically as you type — no need to press a button. Watch the output update in real time.

Review the breakdown Check the detailed breakdown, charts, or tables below the main result for a deeper understanding.

Adjust and compare Change any input value to instantly see how it affects the result. Great for comparing different scenarios.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use ROI Calculator?

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Accurate & Reliable ROI Calculator uses standard mathematical formulas and algorithms, verified against reference implementations. Trust the results for homework, work, or personal use.

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Clear Explanations Get more than just a number. Where applicable, see step-by-step breakdowns, visual representations, and context that helps you understand the result.

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Instant Calculation Results update as you type — no need to press a calculate button or wait for a server response. Real-time feedback helps you explore different scenarios quickly.

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No Data Collection Your inputs are processed locally in your browser. No data is stored, transmitted, or used for any purpose. Close the tab and everything is gone.

Frequently Asked Questions

ROI (%) = (Net Gain / Initial Investment) × 100. Net Gain = Final Value − Initial Investment. Example: invest $10,000, get back $13,500 → ROI = 35%.

Annualized ROI (CAGR) = (Final/Initial)^(1/years) − 1. It shows the compound annual growth rate — what constant yearly return would yield the same result. Example: 35% over 2 years ≈ 16.2% annualized.

It depends on the asset class. Stock market average is ~7–10%/year (inflation-adjusted). Real estate: 8–12%. Higher returns usually come with higher risk. Compare to your investment's benchmark.