WACC Calculator using CAPM
This calculator determines the Weighted Average Cost of Capital (WACC) by first calculating the Cost of Equity using the Capital Asset Pricing Model (CAPM). Fill in the fields below to get started.
1. Cost of Equity (CAPM) Inputs
Typically the yield on a long-term government bond (e.g., 10-year Treasury).
Measures the stock’s volatility relative to the market. β > 1 is more volatile, β < 1 is less.
The expected return of the overall market (e.g., S&P 500 average return).
2. WACC Inputs
Total market value of the company’s shares (Market Cap).
Total value of all company debt (bonds, loans).
The effective interest rate the company pays on its debt.
The company’s effective corporate tax rate.
What is WACC and the CAPM Model?
The Weighted Average Cost of Capital (WACC) is a financial metric that calculates a company’s average cost of financing from all its capital sources, including common stock, preferred stock, and debt. Essentially, WACC represents the blended rate a company is expected to pay to finance its assets. It is a critical benchmark used for investment decisions, corporate valuation, and performance measurement.
The Capital Asset Pricing Model (CAPM) is a tool used to determine the theoretical required rate of return for an asset. It’s a crucial component in calculating WACC, as it provides the Cost of Equity (Re). The CAPM formula links the expected return of a security to its systematic risk (beta) relative to the overall market.
The WACC and CAPM Formulas Explained
CAPM Formula for Cost of Equity
The first step is to calculate the Cost of Equity using CAPM:
Re = Rf + β * (Rm – Rf)
Where (Rm – Rf) is the Equity Market Premium (ERP). This formula shows that the return investors expect is the risk-free return plus a premium for the additional risk they take on.
WACC Formula
Once the Cost of Equity is determined, it’s plugged into the WACC formula:
WACC = (E/V * Re) + (D/V * Rd * (1 – Tc))
This formula weighs the cost of equity and the after-tax cost of debt by their respective proportions in the company’s capital structure. For more on this, consider reading about the Financial Modeling Basics.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Re | Cost of Equity | % | 5% – 20% |
| Rf | Risk-Free Rate | % | 1% – 4% |
| β | Beta | Unitless | 0.5 – 2.5 |
| Rm | Expected Market Return | % | 7% – 12% |
| E | Market Value of Equity | Currency | Varies |
| D | Market Value of Debt | Currency | Varies |
| V | Total Firm Value (E+D) | Currency | Varies |
| Rd | Cost of Debt | % | 3% – 8% |
| Tc | Corporate Tax Rate | % | 15% – 30% |
Practical Examples of Calculating WACC
Example 1: Tech Growth Company
- Inputs: Rf = 3%, β = 1.5, Rm = 10%, E = $800M, D = $200M, Rd = 6%, Tc = 25%
- Cost of Equity (Re): 3% + 1.5 * (10% – 3%) = 13.5%
- WACC: (0.8 * 13.5%) + (0.2 * 6% * (1 – 0.25)) = 10.8% + 0.9% = 11.7%
- Analysis: The high WACC reflects a riskier profile with high growth expectations, typical for a tech company. The DCF Calculator can be used for further valuation.
Example 2: Stable Utility Company
- Inputs: Rf = 2.5%, β = 0.8, Rm = 8%, E = $3B, D = $7B, Rd = 4%, Tc = 21%
- Cost of Equity (Re): 2.5% + 0.8 * (8% – 2.5%) = 6.9%
- WACC: (0.3 * 6.9%) + (0.7 * 4% * (1 – 0.21)) = 2.07% + 2.212% = 4.28%
- Analysis: The low WACC is characteristic of a stable, low-risk utility company with a heavy reliance on cheaper debt financing.
How to Use This WACC Calculator
- Enter CAPM Inputs: Start by providing the Risk-Free Rate, the company’s Beta, and the Expected Market Return to calculate the Cost of Equity.
- Enter WACC Inputs: Input the Market Values of Equity and Debt, the Pre-Tax Cost of Debt, and the Corporate Tax Rate.
- Calculate: Click the “Calculate WACC” button.
- Review Results: The calculator will display the final WACC, along with key intermediate values like the Cost of Equity and capital structure weights. The chart provides a visual breakdown of the capital structure.
- Interpret: Use the WACC as a hurdle rate for investment decisions. A project’s expected return should be higher than the WACC to be considered viable. You can learn more by studying the meaning of Beta.
Key Factors That Affect WACC
- Interest Rates: A change in market interest rates directly impacts the Risk-Free Rate and the Cost of Debt, thereby affecting WACC.
- Market Risk Premium: A higher market risk premium (the difference between market return and the risk-free rate) increases the Cost of Equity.
- Beta: A company’s specific risk profile, measured by Beta, is a primary driver of its Cost of Equity. Higher beta means higher risk and a higher Cost of Equity.
- Capital Structure: The mix of debt and equity financing is crucial. Since debt is typically cheaper and offers a tax shield, a higher proportion of debt can lower WACC, but only up to a point where financial risk becomes too high.
- Corporate Tax Rates: Because interest payments are tax-deductible, a higher corporate tax rate increases the value of the “tax shield” from debt, which can lower the WACC.
- Company Size and Creditworthiness: Larger, more creditworthy companies can often borrow at lower rates, reducing their Cost of Debt and overall WACC.
Frequently Asked Questions
- Why is WACC important?
- WACC is used as the discount rate for future cash flows in a Discounted Cash Flow (DCF) analysis to determine a company’s net present value. It’s a standard hurdle rate for internal investment projects.
- What is a ‘good’ WACC?
- There’s no single “good” WACC. It’s highly dependent on the industry, company size, and risk profile. A lower WACC is generally better as it indicates cheaper financing, but it must be compared to industry peers. For a different perspective on returns, see our ROI Calculator.
- How do I find the Market Value of Equity and Debt?
- The Market Value of Equity (Market Capitalization) is the current share price multiplied by the number of outstanding shares. The Market Value of Debt is typically estimated by using the book value of debt found on the company’s balance sheet.
- Why do we use the after-tax cost of debt?
- Interest payments on debt are tax-deductible, which creates a “tax shield” that reduces a company’s tax liability. This makes the effective cost of debt lower than the stated interest rate.
- Can WACC be used for any project?
- WACC is most appropriate for projects that have a similar risk profile to the company as a whole. For projects with significantly different risk, an adjusted discount rate should be used.
- What are the limitations of the CAPM model?
- CAPM relies on several assumptions that may not hold true, such as efficient markets and rational investors. It also uses historical data (like Beta) to predict future returns, which can be inaccurate.
- Where do I get the input values?
- Risk-free rates can be found from central bank or treasury websites. Beta and market returns are available on financial data platforms like Yahoo Finance or Bloomberg. Other values come from a company’s financial statements. A good place to start is our guide on understanding the cost of debt.
- What if a company has no debt?
- If a company is 100% equity-financed, its WACC is simply equal to its Cost of Equity (Re), as calculated by the CAPM.