Risk-Return Portfolio Calculator

What the risk-return portfolio calculator does

The risk-return portfolio calculator shows what return to expect if you split your money between two assets. It blends the weight and expected return of each asset into one expected portfolio return, the starting point of portfolio theory.

A portfolio has its own return and its own risk, and its expected return is the weighted average of the expected returns of its parts. Each asset counts in proportion to how much money sits in it, so an asset making up 60% of your portfolio has three times the influence of one making up 20%.

How the calculation works

The tool converts each percentage weight into a decimal share (60% becomes 0.60), multiplies each share by that asset's expected return, and adds the two products.

portfolio_return = (w1 / 100) × return_asset1 + (w2 / 100) × return_asset2

In the classic 60/40 portfolio, 60% in an asset expected to return 8% contributes 0.60 × 8 = 4.8 percentage points, and 40% in an asset expected to return 4% contributes 0.40 × 4 = 1.6. The portfolio is expected to return 6.4%. The calculator shows this figure, the contribution of the first asset, and the total of your two weights so you can confirm they sum to 100%.

Why weights matter as much as returns

The weights decide how much each asset's return moves your portfolio. Shifting even ten percentage points of weight from the lower-returning asset to the higher-returning one changes the blended result noticeably. Asset allocation, how much to put in each broad category, is widely regarded as the most important driver of long-term portfolio outcomes, ahead of picking individual securities.

Set both weights to 50% and the portfolio return sits exactly halfway between the two asset returns; raise one weight and the result moves toward that asset. The bar chart plots each asset's return next to the portfolio return.

Checking that your weights add up

In a fully invested portfolio, weights add up to exactly 100%. A lower total means some capital is uninvested, perhaps cash you forgot to allocate, so your real expected return is lower than it looks. A total above 100% means you have double-counted a holding or are using leverage, which magnifies both gains and losses.

Return is only half the picture

This calculator covers only the return side of the risk-return trade-off. Assets with higher expected returns almost always carry higher risk, measured as the volatility of their returns: a portfolio expected to return 8% by concentrating in equities will swing far more than one expected to return 5% that leans on bonds.

A portfolio volatility calculator combines the volatilities of your assets and their correlation to estimate how much the whole portfolio might fluctuate. Combining assets that do not move in lockstep can lower portfolio risk without giving up much expected return, and you need both numbers to design a portfolio deliberately.

Practical uses

When rebalancing, test how a new target allocation changes your expected return before placing any trades. When comparing a conservative mix with an aggressive one, see how much extra return you are chasing and decide whether the added risk is worth it. When explaining a portfolio to someone else, the weighted average gives one headline number in place of a list of individual returns.

With positive weights that sum to 100%, a portfolio's return can never exceed that of its best asset or fall below its worst; it lands in between, pulled toward the asset with the most weight.

Realistic inputs

Last year's returns rarely repeat, so use forward-looking, long-run averages for each asset class that you can defend. Overstating expected returns is a common planning mistake that compounds badly over decades. The calculator stores no market parameters and uses exactly the figures you enter, so the result reflects your own assumptions.

About This Portfolio Expected Return Calculator

Use this portfolio expected return calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.