What is annualized ROI and why does it matter?

It converts any holding period to a per-year rate: ((1 + ROI)^(1/years) − 1). A 40% ROI is spectacular over 1 year (40%/yr) but mediocre over 10 years (3.4%/yr) — annualizing makes investments with different timelines comparable.

ROI Calculator

Q: How do you calculate ROI?

ROI = (Final value − Total cost) ÷ Total cost × 100. Buy for $10,000, sell for $14,000: ROI = 4,000 ÷ 10,000 = 40%.

Q: What counts as a good ROI?

Judge annualized ROI against alternatives: roughly 10% per year matches long-run stock market averages, 4-5% matches low-risk savings. Anything promising far above market returns with low risk deserves deep skepticism.

Q: Can ROI be calculated for a losing investment?

Yes — the same formula applies with a negative result. $20,000 that falls to $16,000 over 2 years is a −20% total ROI and about −10.56% annualized, since the final value is below the amount invested.

Q: How is ROI different from IRR?

ROI as calculated here assumes a single investment and a single payout at the end. IRR (internal rate of return) handles multiple cash flows at different times — regular contributions, partial withdrawals, dividends along the way — and is the more accurate measure whenever money moves in or out mid-investment.

Total return and — the number that actually matters for comparing investments — the annualized return.

Written by the Calculator Index team · Last reviewed September 2026

Return on investment

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Net profit

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Annualized return

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vs. ~10%/yr stock average

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The ROI formulas

ROI = (Final − Cost) ÷ Cost × 100
Annualized = [(Final ÷ Cost)^1/years − 1] × 100

Worked example

Invested $10,000, now worth $14,000 after 3 years:

ROI = 40% total · Annualized = (1.4)^1/3 − 1 = 11.9% per year — slightly ahead of long-run stock averages.

Worked example — a losing investment

Invested $20,000, worth only $16,000 after 2 years: ROI = (16,000 − 20,000) ÷ 20,000 = −20% total.

Annualized = (16,000 ÷ 20,000)^1/2 − 1 = (0.8)^0.5 − 1 = 0.8944 − 1 = −10.56% per year. The same formula works whether the result is a gain or a loss — no special-casing needed.

Common ROI mistakes

Comparing total ROI across different holding periods without annualizing. A 40% ROI over 3 years (11.9%/yr) is not comparable to a 40% ROI over 10 years (3.4%/yr) — always annualize before comparing, as shown above.
Leaving fees, taxes, and carrying costs out of the cost basis. A property's true ROI must include closing costs, maintenance, and insurance, not just the purchase price — otherwise the return is overstated.
Using simple ROI when cash flows happen at different times. Regular contributions or partial withdrawals mid-investment make simple ROI misleading; an IRR-based calculation accounts for the timing of each cash flow.
Comparing nominal ROI to a nominal benchmark without checking inflation. A 5% annualized ROI during a period of 4% inflation is barely a 1% real gain — always check whether the return you're comparing against is nominal or inflation-adjusted.

Using ROI without fooling yourself

Three classic traps. Ignoring time: "I doubled my money" means 26%/yr over 3 years but only 7.2%/yr over 10 — always annualize (that's just CAGR). Ignoring costs: commissions, taxes, maintenance (for property), and your own time all belong in the cost basis. Ignoring risk: a 15% return on a speculative bet and 10% on an index fund aren't equally good outcomes — one of them could easily have been −50%. For repeated cash flows (rent, dividends), simple ROI understates reality; see the dividend calculator for income-producing assets.

Frequently asked questions

How do you calculate ROI?

(Final − Cost) ÷ Cost × 100. $10,000 → $14,000 = 40%.

What is annualized ROI?

The per-year rate: (1+ROI)^1/years − 1. It makes different holding periods comparable.

What counts as a good ROI?

Compare annualized ROI to ~10%/yr stock averages and ~4–5% low-risk yields — and be skeptical of "high return, low risk" claims.

Can ROI be calculated for a losing investment?

Yes — the formula is the same. $20,000 falling to $16,000 over 2 years is −20% total, about −10.56%/yr annualized.

How is ROI different from IRR?

ROI here assumes one investment, one payout. IRR handles multiple cash flows at different times and is more accurate when money moves in or out along the way.

Related calculators

Note: Simple ROI ignores cash-flow timing; for irregular flows, IRR-based measures are more accurate. Not investment advice. Last reviewed: September 2026.