ROI Calculator
Calculate ROI % and net gain from cost and final value — nothing is uploaded.
ROI—
Net Gain—
This is a simplified estimate. Not financial advice.
Calculate ROI online
Enter your initial investment cost and the final value (gain) to see your return on investment percentage and net gain. Everything runs locally in your browser — no data is ever sent anywhere.
How ROI is calculated
ROI % = (Gain − Cost) ÷ Cost × 100. A positive ROI means a profit; negative means a loss.
FAQ
Is my data sent anywhere? No — all calculations happen in your browser.