How to Calculate Your Investment's Rate of Return

What Rate of Return Means and Why It Matters

Rate of return is the percentage gain or loss on money you invested over a specific period. It tells you how much your investment grew (or shrank) relative to what you put in. If you invested $1,000 and it became $1,100 in one year, your rate of return was 10 percent. If it fell to $900, your rate of return was negative 10 percent.

Rate of return matters because it lets you compare different investments on the same scale. A $50 gain on a $500 investment is a 10 percent return. A $50 gain on a $5,000 investment is only a 1 percent return. Without calculating the percentage, you cannot tell which investment performed better relative to the money you risked.

There are several ways to calculate rate of return depending on what you own, how long you held it, and whether you added or withdrew money during that time. The method you choose affects the number you get, so understanding which one fits your situation matters.

Key Takeaways

• Simple rate of return divides your gain or loss by your starting investment amount and expresses it as a percentage.
• Annualized return converts a return over any time period into what it would equal if it happened every year, making returns from different time frames comparable.
• If you added or withdrew money during your holding period, use time-weighted return or money-weighted return to account for the timing of those cash flows.
• Your brokerage statement may calculate return for you, but understanding the method behind the number helps you spot errors and compare accounts correctly.

Simple Rate of Return: The Basic Formula

The simplest calculation works when you invested a lump sum, held it for any length of time, and made no additional deposits or withdrawals. The formula is: (Ending Value − Starting Value) ÷ Starting Value × 100 = Rate of Return (as a percentage).

Suppose you bought $5,000 worth of a mutual fund on January 1. On December 31 of the same year, it was worth $5,400. Your gain is $400. Divide $400 by your starting $5,000 to get 0.08. Multiply by 100 to convert to a percentage: 8 percent return for the year.

If the fund had fallen to $4,700 instead, your loss would be $300. Divide $300 by $5,000 to get 0.06, or 6 percent. Since it was a loss, you would report this as negative 6 percent (or −6 percent).

This method works for any holding period—a month, five years, ten days. The result tells you the total return over that exact span, but it does not account for how long you held the investment. That is where annualized return comes in.

Annualized Return: Comparing Investments Held for Different Lengths of Time

If you held an investment for three months and earned 6 percent, that is not the same as earning 6 percent per year. Annualized return converts any return into an equivalent yearly rate, so you can compare a three-month gain against a five-year gain fairly.

The formula is: (Ending Value ÷ Starting Value) ^ (1 ÷ Number of Years) − 1 × 100 = Annualized Return. The caret symbol (^) means "to the power of."

Example: You invested $10,000 and it grew to $11,000 over two years. First, divide ending by starting: $11,000 ÷ $10,000 = 1.1. Then raise 1.1 to the power of (1 ÷ 2), which is 0.5: 1.1 ^ 0.5 = 1.0488. Subtract 1 and multiply by 100: (1.0488 − 1) × 100 = 4.88 percent annualized return.

This means your investment grew at an average rate of about 4.88 percent per year over the two-year period. If you held a different investment for six months and earned 2 percent, you can now compare: 2 percent over six months annualizes to roughly 4 percent per year, which is slightly lower than 4.88 percent.

Accounting for Deposits and Withdrawals: Time-Weighted and Money-Weighted Returns

Many investors add money regularly—monthly contributions to a 401(k), annual additions to an IRA, or lump sums into a brokerage account. When you deposit or withdraw cash during your holding period, simple rate of return no longer works because the money was not invested for the full time span.

Time-weighted return removes the effect of your deposits and withdrawals to show how the investment itself performed, independent of your cash flows. It breaks your holding period into smaller segments at each deposit or withdrawal date, calculates the return for each segment, then chains them together. This method answers: "How well did this investment perform regardless of when I added money?"

Money-weighted return (also called internal rate of return) factors in the timing and size of your deposits and withdrawals. It shows the actual return you earned on the dollars you had invested at each point in time. This method answers: "What return did I actually earn on my money, given when I invested it?"

Example: You invested $10,000 on January 1. The account grew to $11,000 by June 30. On July 1, you added $5,000. By December 31, the account was worth $17,000. Your time-weighted return would ignore the July deposit and measure the investment's performance in two periods separately. Your money-weighted return would account for the fact that only $10,000 was at risk for the full year, while $5,000 was at risk for only six months. Most brokerage statements use time-weighted return because it isolates the investment's performance from your personal cash flow decisions.

How to Use Your Brokerage Statement

Most brokerages calculate rate of return for you and display it on your account statement or online dashboard. Look for labels like "Total Return," "Performance," or "Gain/Loss." The statement usually shows both the dollar amount and the percentage.

Check whether the return is for a specific time period (year-to-date, last 12 months, since inception) or annualized. Some statements show multiple time periods side by side so you can see how your investment performed over one month, three months, one year, and longer. This helps you spot whether recent performance is typical or an outlier.

If your brokerage does not show return, you can calculate it yourself using the formulas above. Write down your starting balance on a specific date, your ending balance on another date, and any deposits or withdrawals in between. If the math seems off, contact your brokerage—they can explain which calculation method they used and verify the number.

Common Mistakes When Calculating Return

One frequent error is forgetting to account for fees. If your investment gained $500 but you paid $100 in trading commissions or advisory fees, your net return is based on the $400 gain, not the $500. Some brokerages show return before fees and after fees separately, so check which number you are reading.

Another mistake is mixing up total return and annualized return. A 20 percent total return over five years sounds impressive until you annualize it—that works out to about 3.7 percent per year. Conversely, a 2 percent monthly return sounds modest until you annualize it—that compounds to roughly 26 percent per year. Always note the time period when you state a return.

Investors also sometimes calculate return on their original investment amount when the investment has grown. If you bought a stock for $50 and it is now $100, your return is 100 percent on the original $50, not 50 percent on the current $100. Always divide the gain by the starting value, not the ending value.

Return Versus Yield: What Is the Difference?

Return is the total gain or loss on your investment, including both price appreciation and any income (like dividends or interest). Yield is the income portion only, expressed as a percentage of the current price. If you own a stock that pays a $2 annual dividend and costs $100, the yield is 2 percent. If the stock price rises to $110, the yield falls to 1.8 percent even though the dividend stayed the same.

Return captures the full picture of how your money grew. Yield tells you only the income stream. A stock with a high yield but falling price may have a negative total return. A stock with a low yield but rising price may have a strong total return. When comparing investments, look at total return unless you specifically need to know the income component.

Frequently Asked Questions

Do I need to calculate return myself if my brokerage shows it?

No, but understanding the calculation helps you spot errors and know which method your brokerage used. If you manage multiple accounts or want to compare your performance against a benchmark, calculating return yourself gives you control over the method and time period.

What if my investment lost money—how do I calculate a negative return?

Use the same formula. If you invested $5,000 and it fell to $4,200, your loss is $800. Divide $800 by $5,000 to get 0.16, or 16 percent. Since it was a loss, express it as −16 percent. The calculation is identical; the negative sign just indicates a loss rather than a gain.

Should I use simple return or annualized return?

Use simple return if you want to know your total gain or loss over a specific period you held the investment. Use annualized return when comparing investments held for different lengths of time, or when you want to see what an average yearly rate would be. Most long-term investors focus on annualized return because it smooths out short-term volatility.

How do I calculate return if I received dividends or interest?

Include the dividends or interest in your ending value. If your stock was worth $5,000 at the end and you received $200 in dividends during the year, your ending value is $5,200. Use that $5,200 in your return calculation. This gives you total return, which includes both price appreciation and income.

Can I compare my investment return to the stock market average?

Yes, but make sure you are comparing the same time period and the same type of investment. If your stock fund returned 8 percent over three years, compare it to a three-year return for a stock market index, not a one-year return or a bond index return. Your brokerage or a financial website can show you relevant benchmark returns for the same period.