CAPM Calculator
Use the capital asset pricing model in MiniWebtool’s CAPM Calculator to solve for expected return, beta, market return, or the risk-free rate. A Security Market Line shows how modeled return relates to systematic risk.
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Enter the risk-free rate, the stock's beta and the expected market return.
About CAPM Calculator
Welcome to the CAPM Calculator, a comprehensive financial tool for calculating expected return, risk-free rate, market return, or beta using the Capital Asset Pricing Model. This calculator features step-by-step calculations, Security Market Line (SML) visualization, beta interpretation, and risk premium analysis to help you make informed investment decisions.
At a Glance
CAPM Calculator applies the capital asset pricing model, E(Ri) = Rf + β × (E(Rm) - Rf), to solve for expected return, risk-free rate, market return or beta. It plots the result on a Security Market Line.
| Feature | What you get | Good for |
|---|---|---|
| Solve for any variable | Enter three of the four values (expected return, risk-free rate, market return, beta) and leave one blank to solve for it. | Backing out the beta or market return implied by known figures |
| Step-by-step formulas | Each result comes with a breakdown of the CAPM formula and the values substituted into it. | Showing the working in coursework or reports |
| Security Market Line | An interactive chart plots expected return against beta. The intercept is the risk-free rate and the slope is the market risk premium. | Seeing where an asset sits relative to the market |
| Beta interpretation | Explains the result from β below 0 through β of 1 to β above 1.5, with example asset types. | Understanding how volatile an asset is versus the market |
| Risk premium | Shows the market risk premium, E(Rm) - Rf, and the asset's own premium, β × (E(Rm) - Rf). | Estimating the cost of equity or required return |
| Example presets | Buttons load common investment scenarios to try the calculator. | Learning how the inputs interact |
What is CAPM (Capital Asset Pricing Model)?
The Capital Asset Pricing Model (CAPM) is one of the most widely used models in finance for determining the expected return of an asset based on its systematic risk. Developed by William Sharpe, John Lintner, and Jan Mossin in the 1960s, CAPM establishes a linear relationship between the expected return of an investment and its market risk (beta).
CAPM is fundamental to modern portfolio theory and is used extensively in corporate finance for calculating the cost of equity, in investment management for asset valuation, and in capital budgeting for evaluating investment opportunities.
The CAPM Formula
Where:
- E(Rᵢ) = Expected return of the investment
- Rꜰ = Risk-free rate of return (typically Treasury bond yield)
- βᵢ = Beta of the investment (systematic risk measure)
- E(Rₘ) = Expected return of the market
- E(Rₘ) - Rꜰ = Market risk premium
Understanding Beta (β)
Beta measures an asset's sensitivity to market movements and represents the systematic (non-diversifiable) risk of an investment. It indicates how much an asset's return is expected to change for a given change in market return.
| Beta Value | Interpretation | Examples |
|---|---|---|
| β < 0 | Moves opposite to market | Gold, put options |
| β = 0 | No correlation with market | Risk-free assets (T-bills) |
| 0 < β < 1 | Less volatile than market | Utilities, consumer staples |
| β = 1 | Same volatility as market | Index funds (S&P 500 ETF) |
| β > 1 | More volatile than market | Tech stocks, growth stocks |
| β > 1.5 | Significantly more volatile | Leveraged ETFs, speculative stocks |
How to Use This Calculator
- Enter three known values: Input any three of the four CAPM variables (Expected Return, Risk-Free Rate, Market Return, Beta)
- Leave one field blank: The calculator will solve for the missing variable
- Use example presets: Try the example buttons for common investment scenarios
- Analyze results: Review the calculated value, step-by-step breakdown, beta interpretation, and SML visualization
The Security Market Line (SML)
The Security Market Line (SML) is a graphical representation of CAPM that plots expected return against beta. Key features include:
- Y-intercept: The risk-free rate (β = 0)
- Market Portfolio: The point where β = 1
- Slope: The market risk premium (E(Rₘ) - Rꜰ)
- Above SML: Undervalued assets (expected return exceeds required return)
- Below SML: Overvalued assets (expected return below required return)
Risk Premium Analysis
The risk premium is the additional return above the risk-free rate that compensates investors for taking on risk:
- Market Risk Premium: E(Rₘ) - Rꜰ (the extra return for investing in the market portfolio)
- Asset Risk Premium: β × (E(Rₘ) - Rꜰ) (the extra return for the asset's specific systematic risk)
Historical data suggests the long-term U.S. equity market risk premium is approximately 5-7% annually, though this varies over time and across markets.
Applications of CAPM
Cost of Equity Calculation
Companies use CAPM to calculate the cost of equity capital for capital budgeting and valuation purposes. The required return represents the minimum return shareholders expect for investing in the company's stock.
Portfolio Management
Investment managers use CAPM to evaluate whether securities are fairly priced relative to their systematic risk. Assets plotting above the SML are considered undervalued and potential buy candidates.
Capital Budgeting
When evaluating investment projects, companies can use CAPM to determine the appropriate discount rate for cash flows, ensuring the project compensates adequately for its risk level.
Performance Evaluation
CAPM provides a benchmark for evaluating investment performance. Jensen's Alpha measures the excess return of a portfolio above what CAPM predicts, indicating the skill (or luck) of the portfolio manager.
Limitations of CAPM
While widely used, CAPM has several important limitations:
- Unrealistic assumptions: Assumes efficient markets, rational investors, no taxes or transaction costs
- Single-factor model: Only considers systematic risk (beta), ignoring other risk factors
- Historical beta: Uses past data that may not predict future volatility
- Market definition: The true market portfolio is unobservable
- Static model: Does not account for changing risk-free rates or market conditions
Frequently Asked Questions
What is the Capital Asset Pricing Model (CAPM)?
The Capital Asset Pricing Model (CAPM) is a financial model that describes the relationship between systematic risk and expected return for assets. It calculates the expected return of an investment using the formula: E(Ri) = Rf + β × (E(Rm) - Rf), where E(Ri) is expected return, Rf is the risk-free rate, β is beta, and E(Rm) is the expected market return.
What is Beta in CAPM?
Beta (β) measures an asset's sensitivity to market movements. A beta of 1 means the asset moves with the market, beta > 1 indicates higher volatility than the market (aggressive), and beta < 1 indicates lower volatility (defensive). Beta of 0 means no correlation with the market, similar to risk-free assets.
What is the Market Risk Premium?
The market risk premium is the difference between the expected market return and the risk-free rate: E(Rm) - Rf. It represents the additional return investors expect for investing in the market portfolio instead of risk-free assets like Treasury bonds. Historically, the U.S. equity market risk premium has averaged around 5-7% annually.
How is CAPM used in investment decisions?
CAPM is used to determine the required rate of return for adding an asset to a diversified portfolio. If an asset's expected return exceeds the CAPM-calculated required return, it's considered undervalued and a good investment. If the expected return is below the required return, the asset may be overvalued.
What is the Security Market Line (SML)?
The Security Market Line (SML) is a graphical representation of CAPM. It plots expected return on the Y-axis against beta on the X-axis. The line starts at the risk-free rate (where beta = 0) and passes through the market portfolio (where beta = 1). Assets above the SML are undervalued, and assets below are overvalued.
What are the limitations of CAPM?
CAPM assumes markets are efficient, investors are rational, there are no taxes or transaction costs, and all investors have the same expectations. In reality, these assumptions often don't hold. CAPM also only considers systematic risk and ignores unsystematic risk, and historical beta may not predict future volatility accurately.
Additional Resources
Reference this content, page, or tool as:
"CAPM Calculator" at https://MiniWebtool.com/capm-calculator/ from MiniWebtool, https://MiniWebtool.com/
by miniwebtool team. Updated: Jan 28, 2026
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