Calculation of WACC using CAPM Calculator
Your expert tool for determining a company’s Weighted Average Cost of Capital (WACC) with the Capital Asset Pricing Model (CAPM) for cost of equity.
WACC & CAPM Calculator
Cost of Equity (CAPM) Inputs
Cost of Debt & Tax Inputs
Weighted Average Cost of Capital (WACC)
Cost of Equity (Ke)
After-Tax Cost of Debt
Weight of Equity
Weight of Debt
WACC Formula: (Weight of Equity × Cost of Equity) + (Weight of Debt × Cost of Debt × (1 – Tax Rate))
Cost of Equity (CAPM) Formula: Risk-Free Rate + Beta × (Market Return – Risk-Free Rate)
What is the Calculation of WACC using CAPM?
The calculation of WACC using CAPM is a fundamental financial process used to determine a company’s blended cost of capital. WACC stands for Weighted Average Cost of Capital, and it represents the average rate of return a company is expected to pay to its security holders (equity and debt holders) to finance its assets. CAPM, the Capital Asset Pricing Model, is a widely accepted method used to calculate one of the key components of WACC: the cost of equity. This combined calculation is crucial for corporate valuation, investment appraisal, and capital budgeting.
Essentially, the WACC is the minimum return a company must earn on its existing asset base to satisfy its creditors, owners, and other providers of capital. If a company’s returns are consistently below its WACC, its value will decline. Conversely, by investing in projects with returns that exceed the WACC, a company creates value for its shareholders. The calculation of WACC using CAPM provides a robust discount rate for discounted cash flow (DCF) analysis. A great resource for this is understanding discounted cash flow analysis.
The WACC and CAPM Formulas Explained
The calculation involves two primary formulas: one for the Cost of Equity (using CAPM) and one for the WACC itself.
Cost of Equity (Ke) Formula (CAPM)
The Capital Asset Pricing Model (CAPM) provides the expected return on equity by accounting for its sensitivity to systematic, non-diversifiable risk.
Ke = Rf + β * (Rm - Rf)
Weighted Average Cost of Capital (WACC) Formula
The WACC formula combines the cost of equity with the after-tax cost of debt, weighting each by its proportion in the company’s capital structure.
WACC = (E / (E + D)) * Ke + (D / (E + D)) * Kd * (1 - t)
Variables Table
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Ke | Cost of Equity | Percentage (%) | 5% – 25% |
| Rf | Risk-Free Rate | Percentage (%) | 1% – 5% |
| β (Beta) | Stock’s Volatility vs. Market | Unitless Ratio | 0.5 – 2.5 |
| Rm | Expected Market Return | Percentage (%) | 7% – 12% |
| E | Market Value of Equity | Currency ($) | Varies |
| D | Market Value of Debt | Currency ($) | Varies |
| Kd | Pre-Tax Cost of Debt | Percentage (%) | 3% – 9% |
| t | Corporate Tax Rate | Percentage (%) | 15% – 35% |
Practical Examples
Let’s walk through two examples to illustrate the calculation of WACC using CAPM in different scenarios.
Example 1: High-Growth Tech Company
A tech company has a high beta due to its volatility and growth prospects, and it uses less debt.
- Inputs: E = $800M, D = $200M, Rf = 3%, β = 1.5, Rm = 10%, Kd = 6%, t = 21%
- Cost of Equity (Ke): 3% + 1.5 * (10% – 3%) = 13.5%
- WACC: (800/1000) * 13.5% + (200/1000) * 6% * (1 – 0.21) = 0.80 * 13.5% + 0.20 * 4.74% = 10.8% + 0.948% = 11.75%
Example 2: Stable Utility Company
A utility company has stable cash flows, a low beta, and a higher proportion of debt in its capital structure. Understanding different company valuation models is useful here.
- Inputs: E = $400M, D = $600M, Rf = 3%, β = 0.8, Rm = 9%, Kd = 5%, t = 21%
- Cost of Equity (Ke): 3% + 0.8 * (9% – 3%) = 7.8%
- WACC: (400/1000) * 7.8% + (600/1000) * 5% * (1 – 0.21) = 0.40 * 7.8% + 0.60 * 3.95% = 3.12% + 2.37% = 5.49%
How to Use This WACC Calculator
Using this calculator for the calculation of WACC using CAPM is straightforward. Follow these steps for an accurate result:
- Enter Capital Structure Values: Input the Market Value of Equity (E) and Market Value of Debt (D). These are typically found in financial statements or market data providers.
- Input CAPM Variables:
- Risk-Free Rate (Rf): Use the yield on a long-term government bond in the currency of your valuation (e.g., U.S. 10-Year Treasury).
- Beta (β): Find the company’s beta from financial data services. It measures the stock’s sensitivity to market movements. You might want to understand what is beta in more detail.
- Expected Market Return (Rm): Use a long-term historical average return for a broad market index (e.g., S&P 500).
- Input Debt and Tax Values:
- Cost of Debt (Kd): This is the yield-to-maturity on the company’s long-term debt.
- Corporate Tax Rate (t): Use the effective tax rate for the company.
- Interpret the Results: The calculator instantly provides the WACC, along with key intermediate values like the Cost of Equity and capital weights. The chart visualizes the company’s capital structure.
Key Factors That Affect WACC
Several internal and external factors can influence a company’s WACC. A comprehensive calculation of WACC using CAPM requires an awareness of these drivers.
- Market Interest Rates: A change in general interest rates directly impacts the Risk-Free Rate and the Cost of Debt.
- Market Risk Premium: The difference between the expected market return and the risk-free rate (Rm – Rf) can fluctuate with investor sentiment and economic outlook. More on this at equity risk premium.
- Company-Specific Risk (Beta): A company’s operational performance, industry dynamics, and leverage can change its beta, thus altering its cost of equity.
- Capital Structure: The mix of debt and equity a company uses to finance its operations is a primary driver. Shifting this mix changes the weights in the WACC formula.
- Corporate Tax Rates: Since interest on debt is tax-deductible, a change in tax laws directly affects the after-tax cost of debt.
- Credit Rating: A company’s creditworthiness determines its borrowing cost (Cost of Debt). An upgrade or downgrade will change the WACC.
Frequently Asked Questions (FAQ)
A “good” WACC is relative. Generally, a lower WACC is better as it signifies cheaper financing and lower risk. However, it must be compared to the WACC of peer companies in the same industry. A tech startup will naturally have a higher WACC than a stable utility company.
Interest payments on debt are tax-deductible expenses, which creates a “tax shield” that reduces the effective cost of debt for a company. The WACC formula accounts for this by multiplying the cost of debt by (1 – tax rate).
Data can be found on financial websites like Yahoo Finance, Bloomberg, Reuters, and in company annual reports. The risk-free rate is often the yield on the 10-year government bond.
CAPM is the most widely used model because it provides a clear, logical link between the systematic risk of an investment (measured by beta) and its expected return. It quantifies the principle that riskier investments should command higher returns.
If a company has no debt (D=0), its capital structure is 100% equity. In this case, its WACC is simply equal to its Cost of Equity (WACC = Ke).
Yes. In a DCF valuation, WACC is the discount rate applied to future cash flows. A higher WACC leads to a lower present value of those cash flows, resulting in a lower valuation, all else being equal. The calculation of WACC using CAPM is therefore a critical step in valuation.
Always use market values. Market values reflect the current, true cost of financing for a company, whereas book values are historical costs and may not be relevant for future decisions.
The model relies on several assumptions that may not hold true, such as a constant capital structure. The inputs, especially the expected market return and beta, are estimates and can introduce subjectivity. Despite this, it remains a cornerstone of modern finance.