WACC Calculator
Print| Equity Weight (E/V) | 0.00% |
| Debt Weight (D/V) | 0.00% |
When an enterprise raises capital to fund new factory builds, R&D initiatives, or corporate acquisitions, it draws financing from two primary pools: issuing common stock (equity) and raising bonds or bank loans (debt). The blended annual return rate a firm must pay to satisfy both equity investors and debt creditors is its Weighted Average Cost of Capital (WACC).
Our free WACC Calculator computes corporate WACC by weighting the Cost of Equity against the after-tax Cost of Debt based on market capitalization proportions.
How to Calculate Weighted Average Cost of Capital (WACC)
WACC blends the cost of each capital component proportional to its market value weighting in the corporate capital structure.
The Master WACC Formula:
WACC = ( [ E / V ] × Kₑ ) + ( [ D / V ] × K_d × (1 - T_c) )
- E: Market value of equity (Market Capitalization).
- D: Market value of total corporate debt.
- V: Total capital value (E + D).
- Kₑ: Cost of Equity (derived via CAPM:
R_f + β × MRP). - K_d: Pre-tax Cost of Debt (effective interest rate on debt).
- T_c: Corporate income tax rate (interest tax shield factor).
Step-by-Step Corporate WACC Example
Imagine a publicly traded corporation maintains a market capital structure of $70,000,000 in equity (70%) and $30,000,000 in debt (30%), yielding a total capital base of $100,000,000. Market inputs include:
- Cost of Equity (Kₑ): 11.0%
- Pre-Tax Cost of Debt (K_d): 6.0%
- Corporate Income Tax Rate (T_c): 25.0%
Let’s calculate the after-tax cost of debt and resulting WACC:
After-Tax Cost of Debt = 6.0% × (1 - 0.25) = 4.50%
| Capital Component | Market Value | Capital Structure Weight | Component Cost Rate | Weighted WACC Contribution |
|---|---|---|---|---|
| Common Equity (Kₑ) | $70,000,000 | 70.0% | 11.00% | 7.70% |
| Corporate Debt (K_d) | $30,000,000 | 30.0% | 4.50% (After-Tax) | 1.35% |
| Blended WACC Hurdle Rate | $100,000,000 | 100.0% | — | 9.05% WACC |
Frequently Asked Questions (FAQ)
What is WACC used for in financial modeling?
WACC is primarily used as the default discount rate in Discounted Cash Flow (DCF) models to calculate the Present Value (PV) of expected future Unlevered Free Cash Flows (UFCF). It also serves as the internal hurdle rate for capital budgeting projects.
How does corporate tax rate affect WACC?
A higher corporate tax rate lowers WACC. Because corporate interest payments are tax-deductible expenses, debt financing receives an interest tax shield (1 - Tax Rate), reducing effective borrowing costs.
Why is book value debt often used instead of market value debt?
While theoretical WACC requires market value of debt, corporate debt rarely trades on open exchanges. Therefore, valuation practitioners frequently substitute book value of debt as an acceptable proxy for market debt value.