CAPM Expected Return Calculator United States

What the CAPM calculator does

The CAPM expected return calculator estimates the return an investor should require on an asset, given how risky it is compared with the broad market. It uses the Capital Asset Pricing Model, a standard framework in finance courses, to combine three inputs (the risk-free rate, the asset’s beta and the expected market return) into one expected return.

The model pays investors for two things: the time value of money, measured by the risk-free rate on a safe government security, and the risk they bear, measured by a premium that scales with how much the asset amplifies market movements. The calculator adds the two to give the return you should expect before committing capital.

The CAPM formula

• Expected return = Risk-free rate + Beta x (Market return – Risk-free rate)

The term in parentheses is the market risk premium, the extra return investors expect for holding the market portfolio instead of a risk-free asset. Beta scales that premium to the specific asset: a high-beta asset gets a larger share because it carries more market risk, and a low-beta asset gets a smaller share.

The calculator shows the market risk premium and the asset’s own risk premium separately. The asset risk premium plus the risk-free rate is the expected return.

Understanding beta

Beta measures how sensitive an asset’s returns are to movements in the overall market. A beta of 1.0 means the asset tends to move in line with the market. A beta of 1.5 means it tends to move one and a half times as much, rising more in up markets and falling more in down markets. A beta below 1.0 signals a more defensive asset, and a negative beta describes an asset that tends to move the opposite way, which can help with diversification.

Because beta drives the risk premium, small changes in it can change the expected return noticeably. Published betas are estimates from historical data and vary by data provider and time window, so check a couple of sources and consider a range.

The risk-free rate and market return

The risk-free rate is the return available with essentially no default risk. Investors use the yield on U.S. Treasury securities as a proxy, matching the maturity to their horizon: a short-term Treasury yield for a short holding period, a longer-dated yield for a long-term valuation.

The expected market return is what you anticipate from a broad market portfolio, such as a large index fund, over your horizon. It is an estimate, and investors disagree about it; some use long-run historical averages, others forward-looking models. Since the market risk premium is this figure minus the risk-free rate, your market assumption feeds directly into the result.

How to use the result

As a hurdle rate, the CAPM return is the minimum that compensates you for the asset’s risk; if you expect the asset to return less, the model says it is not paying enough for that risk. As a cost of equity, it is the discount rate analysts use to convert an asset’s future cash flows into a present value, so a higher required return lowers that value.

To compare assets, enter each one’s beta with the same risk-free rate and market return. Under the model, a higher expected return always comes with higher market sensitivity.

Limitations

CAPM assumes markets are efficient, that beta captures all relevant risk, and that investors care only about market risk. In practice, factors such as size, value, momentum and liquidity affect returns in ways one beta does not capture, and betas change over time. The model also depends on a forecast of the market return, which no one knows in advance.

Treat the output as a transparent benchmark, not a forecast. It makes you state your assumptions about risk and return and gives a consistent way to compare assets, so use it alongside other analysis. Update your inputs when yields move or your view of the market changes.

This is general information only and not investment advice. Confirm your assumptions and consult a qualified professional before making investment decisions.

About This CAPM Calculator

Use this CAPM 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.