Finance

ROI calculator

Calculate return on investment: ROI %, net profit, and multiplier. Optional annualised ROI with time period.

Investment amount ($)

Return amount ($)

Time period (optional)

Annualised ROI

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use ROI calculator

01 Fill in the required values using the fields provided
02 Results calculate automatically as you type
03 Copy or note the result — all calculations stay on your device

Frequently asked questions

Common questions about ROI calculator.

Is ROI calculator free to use?

Yes, ROI calculator is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does ROI calculator upload my data to a server?

No. ROI calculator runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use ROI calculator on my phone or tablet?

Yes. ROI calculator is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

Are these results accurate enough to rely on?

ROI calculator uses well-established formulas and provides accurate estimates for everyday use. For financial, medical, or legal decisions, always consult a qualified professional.

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About ROI calculator

Return on investment (ROI) measures the profitability of an investment as a percentage: (gain − cost) ÷ cost × 100. A 100% ROI means you doubled your money; 50% means you gained half again. The ROI Calculator shows ROI percentage, net profit (return minus investment), and the multiplier (how many times your money grew). An optional time period input calculates annualised ROI — the equivalent yearly return if the investment had grown at a constant rate. This normalises returns across different holding periods and makes it easier to compare a 6-month trade with a 3-year investment. All calculations run locally.