CAPM Calculator

CAPM stands for Capital Asset Pricing Model. It is a foundational financial model that describes the relationship between the expected return of an investment and its risk relative to the market. It helps investors determine whether an asset offers a fair return given its level of systematic risk.

The CAPM formula is: Expected Return = Rf + β × (Rm − Rf), where Rf is the risk-free rate, β (beta) is the asset's sensitivity to market movements, and Rm is the expected market return. The term (Rm − Rf) is called the market risk premium.

Beta (β) measures how volatile an asset is relative to the overall market. A beta of 1 means the asset moves in line with the market. A beta greater than 1 indicates higher volatility and higher expected returns, while a beta below 1 suggests lower risk and lower expected returns. A negative beta means the asset tends to move inversely to the market.

The market risk premium is the difference between the expected market return and the risk-free rate (Rm − Rf). It represents the additional return investors expect for taking on the risk of investing in the market rather than a risk-free asset like a government bond.

The risk-free rate is typically based on the yield of government-issued bonds, such as U.S. Treasury bills or 10-year Treasury notes, since these are considered virtually free of default risk. The choice of maturity can vary depending on the investment's time horizon.

CAPM relies on several assumptions that may not hold in reality, such as markets being perfectly efficient, investors being rational, and beta being a stable and complete measure of risk. It also ignores factors like liquidity, behavioral biases, and multi-factor risks that models like the Fama-French three-factor model attempt to address.

CAPM is widely used in corporate finance and investment management to estimate the cost of equity, evaluate the performance of investment portfolios, and set required rates of return for capital budgeting decisions. It provides a benchmark to assess whether an investment's expected return is commensurate with its risk.

Yes, it is theoretically possible. If an asset has a sufficiently negative beta, the CAPM formula can produce an expected return below the risk-free rate or even negative. This would imply the asset acts as a hedge or safe haven during market downturns, so investors accept a lower return in exchange for that protection.