Return on Investment Calculator (Total and Annualized)

What this calculator counts and what it does not

The inputs are intentionally simple: what you put in, what it is worth now, how long you held it, and what it cost you in fees or commissions. The output is your ROI after fees, both total and annualized, plus the dollar amount of net gain.

For stock and ETF investments, the final value should include dividends if you reinvested them or if you are doing total return analysis. If you took the dividends as cash, decide whether to include them based on how you want to think about the investment.

For real estate, the final value should be the price you actually got at sale, after agent commissions and closing costs, which you can include in the fees field. If you are doing a paper ROI on an unsold property, use a realistic estimate of what you would net at sale, not the Zillow estimate.

For projects and side businesses, treat initial investment as everything you spent to launch and final value as what you have collected so far plus what you could sell it for. Be honest with both numbers.

When annualized ROI is the right number

Always use annualized ROI when comparing investments held for different periods. The math of compound growth means a 60 percent total return over two years is not three times better than a 20 percent return over one year. It is actually only marginally better on an annualized basis, about 26.5 percent per year.

Use annualized ROI when comparing against benchmarks. Stock market historical returns are quoted annually. If you say the S&P 500 has returned about 10 percent annually over the long term, you can directly compare that to your annualized ROI to see if your investment beat or lagged the market.

When total ROI is the right number

Use total ROI for short term decisions where time horizon does not vary much. A six month flip versus another six month flip is fine to compare on total ROI alone.

Use total ROI when explaining returns to non-financial audiences. People understand the phrase you doubled your money more easily than you achieved a 12 percent annualized CAGR over six years. The numbers can mean the same thing, but the first one lands.

Common ROI mistakes

Leaving out fees. Trading commissions, real estate transaction costs, fund expense ratios, performance fees, and management fees all reduce real return. A fund that returned 8 percent before a 1.5 percent fee returned 6.5 percent to you, not 8 percent. The calculator subtracts fees from your gain.

Forgetting to compare to alternatives. An ROI in isolation is not very useful. A 7 percent return looks great compared to a savings account and looks mediocre compared to a comparable stock index. Always pick a benchmark.

Not adjusting for risk. A 12 percent return from a volatile single stock is not the same as a 12 percent return from a diversified portfolio, even if the calculator shows the same number. Risk affects the probability of getting that return again.

Ignoring inflation. If your investment returned 5 percent over the same period that inflation ran at 4 percent, your real return is closer to 1 percent. For long horizons especially, use the inflation calculator alongside this one to understand purchasing power gain.

A worked example

Say you bought $20,000 of an index fund three years ago and it is now worth $26,500. Your management fees over those three years totaled $300. Plug in $20,000, $26,500, 3 years, and $300 in fees.

Total ROI is 31 percent. Net gain is $6,200. Annualized ROI is approximately 9.4 percent per year. That number lets you compare directly against the S&P 500 over the same three year window, against your friend's house flip, or against your own bond portfolio. Without the annualized figure you would only know you made $6,200, which is useful but tells you nothing about whether it was a good use of your capital.