Asset Allocation Return Calculator

60% equity at 8%, 30% bonds at 4%, 10% cash at 3% = 6.3% weighted return. Standard portfolio construction arithmetic. Raising the equity share tends to increase both the expected return and the volatility of the portfolio.

Run it with sensible defaults

Using equity of 60% at an 8% return, bonds of 30% at 4%, and the remaining 10% in cash at 3%, the calculation works out to 6.30%. The defaults are a starting point rather than a suggested mix.

The levers in this calculation

Each return assumption moves the result by exactly its own weight. At the defaults, adding a percentage point to Equity Return raises the portfolio return by 0.60 points, because equities are 60% of the mix. The same change to Bond Return moves it 0.30 points, and to Cash Return 0.10 points. That is the whole sensitivity story here: the weights are the multipliers, so an assumption applied to a small slice cannot move the answer much however wrong it turns out to be.

How the math works

The result is the weighted average of the three return assumptions. Each allocation percentage is multiplied by its return, the three products are added, and the total is divided by 100. Cash is not entered as a weight: it is whatever is left after equity and bonds, so 60 and 30 leave 10% in cash. Entering equity and bond weights that add to more than 100 returns an error rather than a negative cash holding.

Where this fits in planning

This is a "what-if" tool, not a forecast. It helps to test ideas: what happens to the result as the Equity % or the Equity Return changes. Running several sets of figures shows how sensitive the result is to each input; a single set does not.

Related calculations worth running

The 100 minus age rule calculator, the asset allocation calculator and the asset allocation drift calculator cover adjacent parts of the same question. Running two or three together shows where a single assumption is carrying more weight than it first appears.

Worked example

Suppose you hold three asset classes and want to model the blended return:

• Equities: 50% of portfolio, expected return 7% per year
• Bonds: 35% of portfolio, expected return 3.5% per year
• Cash: 15% of portfolio, expected return 2% per year

Entering these figures into the calculator yields: (0.50 × 7) + (0.35 × 3.5) + (0.15 × 2) = 3.5 + 1.225 + 0.30 = 5.025% blended return. This illustrates how a conservative allocation with meaningful equity exposure can model a mid-range outcome across market conditions.

Scenarios where this tool matters

This calculator covers scenarios such as:

• Comparing two or more allocation mixes side by side to see which returns higher estimates
• Testing how sensitive your overall return is to small changes in equity allocation or asset class assumptions
• Building narrative around what a given portfolio mix is expected to generate under stable conditions
• Stress-testing assumptions: "if bonds returned 2% instead of 4%, what would the portfolio return be?"
• Isolating the impact of one input without recalculating by hand

When this matters less

The calculator is less helpful for modelling actual sequence risk, inflation-adjusted returns, or the effects of fees and withdrawals. Those demand additional layers of calculation.

What the result shows and does not show

The output is a weighted average return, a point estimate of blended performance under the assumptions entered. It shows how different asset weightings affect the overall figure when each class performs at its stated rate.

It does not show:

• Volatility or risk profile of the portfolio
• How returns will actually unfold month to month or year to year
• The effect of fees, taxes, or inflation
• Rebalancing costs or market timing
• Historical performance or future probability of achieving the stated returns
• Drawdown depth or recovery time in adverse markets

Educational context

This calculation is for educational illustration and scenario modelling only. Actual portfolio outcomes depend on market conditions, timing, costs and behaviour, none of which a static weighted average captures.