ROI calculator

What ROI actually measures

Return on investment answers one blunt question: for every dollar you committed, how much did you get back? Take what the investment is worth now (or what it returned when you sold), subtract what you originally put in, divide by that original amount, and multiply by 100. The result is a percentage that strips away the absolute size of the bet so you can compare a tiny position against a huge one on equal terms. A $500 profit on $1,000 is a 50% ROI; a $5,000 profit on $50,000 is only 10% — the first put your capital to work far harder, even though the second earned more dollars.

The calculator above takes two figures — the amount invested and the final value — and instantly returns your total ROI, your net profit in dollars, and the return multiple (a 1.8× multiple means every dollar became $1.80). That multiple and the percentage are two views of the same thing: an 80% ROI is a 1.8× return.

The time problem — why annualized return matters

Plain ROI hides the single most important variable in investing: time. The formula has no idea whether your 80% gain took eight months or eighteen years, yet those are wildly different outcomes. This is where the annualized return — the compound annual growth rate, or CAGR — earns its keep. It restates the total gain as a smooth, steady percentage earned every year, so two investments held for different lengths of time finally become comparable.

The math compounds rather than simply dividing: CAGR is the per-year rate that, applied year after year, turns your amount invested into the final value. An 80% total ROI is about 34% a year if it happened over 2 years, but only about 3% a year stretched over 20. Same headline, opposite verdict. Whenever you’re tempted to brag (or despair) about a total ROI, convert it to its annualized rate first — that’s the number that tells you whether the investment actually beat a savings account, inflation, or the broad market.

How to read the chart and table

Because ROI alone is a single snapshot, the tool draws the journey between your two figures. The value curve starts at the amount invested in year zero and compounds at your annualized rate until it lands exactly on the final value at the end of the holding period. It’s a smooth model, not a record of the real ups and downs — actual investments zig-zag — but it shows the steady path that produced your result and makes the power of compounding visible: the curve bends upward as gains start earning gains.

The year-by-year table puts numbers to that curve. Each row shows the modelled value at the end of the year, the growth added that year, and the cumulative profit over the amount invested. Read it top to bottom and you can see how much of the final gain arrived early versus late — and, with a loss, watch the value erode instead. It’s the clearest way to feel the difference between a fast return and a slow one even when the totals match.

The limitations of ROI

ROI is powerful because it’s simple, but that simplicity cuts both ways. Beyond ignoring time, a basic ROI figure usually ignores fees and commissions (which raise your true cost), taxes on gains and dividends, and the effect of inflation, which quietly shrinks the purchasing power of every dollar you get back. A 30% ROI over a decade can be a real-terms loss once inflation is counted. ROI also says nothing about risk — two investments with the same return can carry very different odds of a wipeout — and it doesn’t handle messy real-world cash flows like money added or withdrawn partway through. For those, money-weighted measures (IRR) are more precise. Treat ROI as a fast, honest first read, not the final word.

Related tools & guides

• Investment growth calculator — project a starting amount plus regular monthly contributions forward at an expected return.
• Compound interest calculator — see how compounding alone builds a balance over time, the engine behind your annualized return.
• All calculators — browse the rest of our free money tools.

These figures are for planning and education, not financial advice. Past returns don’t predict future ones — confirm the real numbers, fees and tax treatment for your own situation before acting.