Portfolio Expected Return Calculator

How to calculate the expected return of a mixed-asset portfolio

The expected return of a portfolio is not a single asset's return - it is a weighted average of the returns of all the assets it contains, blended proportionally according to how much of each you hold. This is one of the foundational concepts in investment theory, and this calculator applies it directly: enter the weight and expected return for each asset, and it computes the portfolio-level blended return along with projected values for a benchmark 10,000 portfolio over multiple time horizons.

The formula is straightforward: portfolio return = sum of (weight of each asset divided by 100, multiplied by that asset's expected annual return). For example, if you hold 60% in stocks expecting 9%, 30% in bonds expecting 4%, and 10% in cash expecting 2%, your blended return is (0.60 x 9) + (0.30 x 4) + (0.10 x 2) = 5.4 + 1.2 + 0.2 = 6.8% per year. This single figure represents the expected annual growth of your entire portfolio, accounting for the drag of lower-returning assets and the boost from higher-returning ones.

The projection to 1, 5, and 10 years uses this blended rate applied as a compound annual return to a 10,000 portfolio. Because the calculation uses annual compounding, the 10-year figure is not simply 10 times the 1-year gain - it is considerably larger due to the compounding effect. The 5 and 10 year projections are particularly useful for visualising how different allocations diverge over time. A 2 percentage point difference in blended return, which might seem small, can mean tens of thousands of dollars difference in portfolio value over a decade.

The calculator also validates that your entered weights sum to approximately 100%. This is a necessary check because portfolio weights are proportional allocations - if they do not sum to 100%, the blended return calculation is meaningless. A small rounding tolerance of plus or minus 1 percentage point is allowed to accommodate minor rounding in real allocation data.

Choosing return assumptions for each asset class

The quality of this calculator's output depends entirely on the quality of the return assumptions you enter. For each asset class, the expected return should reflect a reasonable long-run average, not a recent exceptional performance period. Using last year's equity return - which might have been 20% or 25% in a strong year - as the expected return for the next decade is likely to produce an unrealistically optimistic projection.

Common long-run return assumptions used in financial planning include: global or domestic equity indexes in the range of 7% to 10% per year (before fees and tax), government bond portfolios at 3% to 5% depending on duration and current yield environment, property or real estate assets at 5% to 8% blending income and capital growth, and cash or short-term fixed income at 2% to 4% depending on the interest rate environment. These are starting points, not certainties. Actual returns vary year to year and depend on many factors including inflation, economic conditions, and the specific funds or securities held.

It is also worth noting that the blended return does not capture the full picture of a multi-asset portfolio's behaviour. Two portfolios with the same blended return can behave very differently depending on whether the assets are correlated or not. A portfolio of assets that tend to move together - for example, two different equity funds in the same market - offers little diversification benefit. A portfolio where assets are negatively or uncorrelated - for example, equities and government bonds - can reduce overall volatility while maintaining a similar blended return. The expected return calculator shows the average, but the portfolio volatility calculator shows the risk side of that picture.

Using this calculator to compare allocation strategies

One of the most practical uses of this tool is running multiple scenarios to compare how different allocation choices affect your expected return. You can model a growth-oriented portfolio (80% equity, 15% bonds, 5% cash) against a balanced portfolio (60/30/10) and a conservative portfolio (30/60/10) to see the trade-off in projected outcomes over various time horizons. The differences over 1 year may seem modest. Over 10 years, the gap becomes much more significant and helps clarify whether the higher equity allocation and its associated higher volatility is worth it for your situation.

You can also use this calculator to model the impact of changing your allocation as you approach a financial goal. Many financial advisers recommend gradually reducing equity exposure and increasing bond and cash allocations as a goal date approaches, a process known as de-risking or glide path allocation. By running the calculator at different points in your timeline, you can see how the blended return changes as you shift the allocation, and factor that into your savings rate planning.

These projections are for illustration and education only. They assume constant annual returns and do not account for inflation, investment fees, tax, or the variable and sometimes negative nature of real market returns. This is not financial advice. Seek guidance from a qualified financial adviser for a personalised investment strategy.