Portfolio Investment Return Calculator
Calculate the overall return of a portfolio from the returns and weights of up to three assets. Enter each investment's expected return and its percentage weight; the weights must add up to 100%.
Weighted Portfolio Return Calculator
Portfolio Return Formula
Where:
- \(R_p\) — expected return of the portfolio (%)
- \(R_1\), \(R_2\), \(R_3\) — expected returns of the individual assets (%)
- \(W_1\), \(W_2\), \(W_3\) — weights of the individual assets in the portfolio (%)
The formula is a weighted average: each asset's return contributes to the portfolio return in proportion to its share of the total investment. The weights must sum to 100%.
Portfolio Return – Calculation Example
Example: a portfolio is split between three assets. Asset 1 is expected to return 8% and makes up 50% of the portfolio, asset 2 is expected to return 6% and makes up 30%, and asset 3 is expected to return 10% and makes up the remaining 20%.
\[ R_p = \frac{8 \times 50 + 6 \times 30 + 10 \times 20}{100} = \frac{400 + 180 + 200}{100} = \frac{780}{100} \]
Result: the portfolio's expected return is 7.8%.
How to Use the Portfolio Return Calculator
- Enter the expected return of the first asset in the Return of Asset 1 field (in percent).
- Enter how much of the portfolio it represents in Weight of Asset 1 (in percent).
- Repeat the same steps for the second and third assets in the Return of Asset 2, Weight of Asset 2, Return of Asset 3 and Weight of Asset 3 fields.
- Check that the three weights add up to exactly 100%. If they don't, the calculator shows an error instead of a result.
- Read the Return on Portfolio — the weighted-average return expressed in percent.
What Is Portfolio Return?
Portfolio return is the overall gain or loss an investor expects (or has realized) from a collection of investments, expressed as a percentage of the amount invested. Because a portfolio usually holds several assets in different proportions, its return is not the simple average of the individual returns — it is a weighted average, where each asset counts according to its share of the total value.
Suppose one asset returns 20% but represents only 5% of the portfolio, while another returns 4% and represents 80%. The portfolio's return will be much closer to 4% than to 20%, because the larger position dominates the outcome. This is exactly what the formula captures: multiplying each return by its weight and summing the results tells you how much each holding actually contributes to overall performance.
The result is best interpreted as an expected return when you feed in forecasts, or as a historical return when you feed in realized figures for a period. It is a key input in asset allocation decisions, portfolio optimization, and performance reporting, and it is the standard first step when comparing a portfolio against a benchmark such as a stock index.
Assumptions, Limitations and Practical Tips
- Weights must sum to 100%. The calculator checks this automatically. If your portfolio holds fewer than three assets, set the unused weight to 0 and the return to any value — a zero weight removes that asset from the calculation.
- The calculation ignores rebalancing within the period. It assumes the weights stay constant. In reality, weights drift as prices move, so a realized portfolio return may differ slightly from the weighted average of asset returns.
- Returns must cover the same period. Mixing an annual return with a monthly return will produce a meaningless result. Convert everything to the same time horizon first.
- Risk is not captured. Two portfolios can have the same expected return but very different volatility. To estimate the return of an individual stock given its market risk, you can use the Capital Asset Pricing Model (CAPM) calculator.
- More than three assets? Apply the same pattern manually: multiply each asset's return by its weight, sum all products, and divide by 100.
A few related tools can extend this analysis. To see how the portfolio's return compounds over several years, use the compound interest calculator; to compare an investment's growth rate over time, try the compound annual growth rate (CAGR) calculator; and to convert a nominal return into its true annual equivalent, see the effective annual yield calculator.
Frequently Asked Questions
How do I calculate portfolio return by hand?
Multiply each asset's return by its weight, add the products, and divide by 100. For example, with returns of 8% and 5% weighted at 60% and 40%: \( (8 \times 60 + 5 \times 40) / 100 = 6.8\% \). Always express weights as percentages of the total investment, and make sure they add up to 100% before you compute anything.
What is a good portfolio return?
There is no universal number — it depends on the asset mix and market conditions. Historically, a diversified portfolio of roughly 60% stocks and 40% bonds has averaged around 7–8% per year before inflation. Portfolios heavy in stocks can target higher returns but with larger swings. Past performance never guarantees future results, so treat any expected return as an estimate, not a promise.
Can I use this calculator for only two assets?
Yes. Set the third asset's weight to 0 — the return value you enter for it then has no effect, because anything multiplied by zero is removed from the sum. For a single asset, set its weight to 100% and the other weights to 0; the result will simply equal that asset's return.
How do I convert monthly and annual returns to the same period?
To turn a monthly return into an annual one, use compounding, not simple multiplication by 12: \( (1 + r_{monthly})^{12} - 1 \). To annualize a quarterly return, use \( (1 + r_{quarterly})^{4} - 1 \). Going the other way, take the 12th or 4th root. Simple multiplication (e.g., 2% per month = 24% per year) understates the true compounded figure.
Why isn't portfolio return just the average of the individual returns?
Because each holding matters in proportion to its size. If 90% of your money earns 3% and 10% earns 30%, the simple average would be 16.5%, but your actual return is only \( (3 \times 90 + 30 \times 10)/100 = 5.7\% \). The weighted average reflects how much money is actually working at each rate — which is the only number that matches your real gain or loss.
Can weights be negative or exceed 100%?
In this calculator, no — weights must stay between 0 and 100% and sum to exactly 100%. Negative weights only appear in advanced contexts like short positions or leveraged portfolios, which the weighted-average formula handles mathematically but this tool does not. If one weight exceeds 100%, another would have to be negative to compensate, so the same restriction applies.
Does portfolio return tell me how risky my investments are?
No. Two portfolios can both return 7% while one swings far more than the other. Return says nothing about volatility, which depends on how the assets' prices move relative to each other (their correlations). To assess risk, look at measures like standard deviation, or estimate a fair return for a given level of market risk using the CAPM approach before feeding figures into this calculator.
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