What Is ROI? Return on Investment Explained Simply

Return on Investment (ROI) is a simple percentage that tells you how much you gained or lost relative to what you put in. Because it's expressed as a percentage rather than a raw amount, it lets you compare completely different investments — stocks, a business, real estate — on equal footing.

The ROI Formula

ROI (%) = (Final Value − Initial Investment) / Initial Investment × 100

A Worked Example

Say you invested ₹50,000 in a mutual fund and it's now worth ₹62,500. ROI = (62,500 − 50,000) / 50,000 × 100 = 25%. You made a net gain of ₹12,500 on your original investment.

What ROI Doesn't Tell You

A 25% ROI over one month is very different from a 25% ROI over five years, but the raw percentage looks identical either way — ROI ignores the time period entirely. It also doesn't account for risk: two investments with the same ROI can carry very different chances of losing money. That's why ROI is best used alongside the holding period and a sense of the risk involved, not as the only number that matters.

Comparing Multiple Options

ROI is most useful when comparing options side by side — for example, choosing between two projects, ad campaigns, or investment opportunities where you know the cost and the expected return of each.

Plug in your initial investment and final value into our ROI calculator below to instantly see your percentage return and net gain or loss.