Free WACC calculator. See how to calculate WACC step by step from equity, debt, cost of equity, cost of debt, and tax rate, plus a full worked example.
Interpret the result as the company’s average financing cost. A lower WACC usually means capital is cheaper and future cash flows are discounted less aggressively, while a higher WACC means investors require a higher return for risk. This is why analysts often compare WACC with project returns, IRR, net present value, and ROIC when deciding whether an investment creates value.
WACC stands for Weighted Average Cost of Capital. It is the blended return a company must earn to satisfy all major capital providers, usually debt holders and equity investors.
In practical finance work, WACC is often used as a discount rate in valuation and capital budgeting. A lower WACC usually means cheaper financing and higher present values, while a higher WACC means the company or project must earn more to create value.
How to Calculate WACC
To calculate WACC, first estimate the market value of equity and the market value of debt. Then estimate the cost of equity, the cost of debt, and the corporate tax rate. Finally, weight those funding costs by their share in the capital structure and sum the results.
- Determine the capital structure using equity and debt values.
- Estimate cost of equity, often with CAPM.
- Estimate pre-tax cost of debt.
- Adjust debt for taxes using
(1 - t).
- Weight each component and add them together.
For most company-wide valuation work, market values are preferred over book values because they better reflect the current cost of capital in the market.
Cost of Equity: The CAPM Method
The cost of equity is most commonly estimated using the Capital Asset Pricing Model (CAPM):
rE = rf + β × (rm − rf)
Where:
rf — risk-free rate, typically the current 10-year government bond yieldβ (beta) — how much the stock moves relative to the broader market; above 1 means more volatile, below 1 means less volatile(rm − rf) — equity risk premium (ERP), the excess return investors expect over the risk-free rate; typically 4.5%–6% for developed markets
Example: with a risk-free rate of 4.5%, beta of 1.2, and ERP of 5.5%, the cost of equity is 4.5% + 1.2 × 5.5% = 11.1%. Beta estimates for publicly traded companies are available from financial data providers or can be derived from historical return data.
WACC Worked Example
The following step-by-step example uses illustrative values to show how WACC is calculated in practice:
- Market value of equity (E): $600M
- Market value of debt (D): $200M
- Total capital (V = E + D): $800M
- Beta: 1.2 | Risk-free rate: 4.5% | Equity risk premium: 5.5%
- Pre-tax cost of debt: 6.0% | Corporate tax rate: 25%
Step 1 — Capital structure weights:
E/V = $600M / $800M = 75% | D/V = $200M / $800M = 25%
Step 2 — Cost of equity (CAPM):
rE = 4.5% + 1.2 × 5.5% = 11.1%
Step 3 — After-tax cost of debt:
rD × (1 − t) = 6.0% × (1 − 0.25) = 4.5%
Step 4 — WACC:
WACC = 0.75 × 11.1% + 0.25 × 4.5% = 8.325% + 1.125% = 9.45%
This means the company must earn at least 9.45% on its invested capital to satisfy both equity and debt holders. Use this rate as the discount rate when discounting firm-level free cash flows in a DCF model.
WACC vs Discount Rate
WACC is one specific type of discount rate, but not every discount rate is WACC. WACC is the blended financing cost of the firm, while a discount rate is the broader rate used to convert future cash flows into present value.
| Term |
Meaning |
Typical use |
| WACC |
Company-wide blended cost of capital |
DCF using firm-level cash flows |
| Discount rate |
Any rate used to discount future value |
Project, asset, or firm valuation depending on context |
If you are valuing the whole firm using operating cash flows, WACC is often the correct discount rate. If you are valuing a narrower or risk-adjusted project, a different discount rate may be more appropriate.
WACC in DCF Valuation
WACC is most often used in DCF valuation when discounting cash flows that belong to the whole firm, such as FCFF. In that setup, WACC reflects the blended return required by both debt and equity holders.
If you are evaluating project cash flows directly, you will often move from WACC to NPV and compare the project result with IRR. If you only need to discount a single future amount rather than a full corporate cash-flow stream, use the Present Value Calculator.
A common workflow is: estimate cost of equity with CAPM, combine it with after-tax cost of debt in WACC, then use that rate in a DCF or NPV model to judge whether the investment creates value.
WACC Sensitivity: Why Small Changes Matter
A small change in WACC can have a large impact on estimated firm value. The table below shows how a shift in WACC affects the present value of a firm generating $100M of free cash flow annually in perpetuity (PV = FCFF ÷ WACC):
| WACC |
Implied firm value ($100M FCFF / WACC) |
vs 9.45% base |
| 7% | $1,429M | +35% |
| 8% | $1,250M | +18% |
| 9% | $1,111M | +5% |
| 9.45% | $1,058M | base |
| 10% | $1,000M | −5% |
| 11% | $909M | −14% |
| 12% | $833M | −21% |
This is why analysts run WACC scenarios rather than relying on a single point estimate. A ±1% error in the discount rate can shift a valuation by 10%–20%, making accurate input estimation essential.
Typical WACC by Industry
WACC varies by industry based on capital structure norms, business risk, and the prevailing interest-rate environment. The ranges below are approximate for developed markets and shift as risk-free rates and equity risk premiums change:
| Industry |
Typical WACC range |
Key driver |
| Utilities | 5% – 8% | Regulated cash flows, high debt capacity |
| Real Estate (REIT) | 6% – 9% | Asset-backed, moderate leverage |
| Consumer Staples | 6% – 9% | Low volatility, predictable demand |
| Industrial / Manufacturing | 7% – 11% | Cyclical revenues, moderate capex |
| Healthcare (large pharma) | 7% – 11% | Stable revenue, patent-protected products |
| Energy (Oil & Gas) | 8% – 12% | Commodity price risk, capital-intensive |
| Technology | 8% – 14% | Higher growth expectations, low debt, higher beta |
| Biotech / Early-stage pharma | 12% – 20%+ | High failure risk, long development timelines |
Use these ranges as a sanity check: if your WACC estimate falls well outside the typical range for the sector, revisit your cost of equity inputs or capital structure assumptions.
WACC Calculator FAQ
What is WACC?
WACC (Weighted Average Cost of Capital) is the average rate a company pays for its financing, weighted between equity and debt. It represents the required return investors expect and is commonly used as a discount rate in valuation.
How do I calculate WACC?
Use the formula WACC = (E/V) × rE + (D/V) × rD × (1 - t). If preferred stock is included, add (P/V) × rP. Here V = E + D (+ P), based on market values.
What inputs do I need to calculate WACC?
You need the market value of equity, market value of debt, cost of equity, pre-tax cost of debt, and corporate tax rate. If the company has preferred stock, include the preferred stock value and cost of preferred stock as an additional capital component.
What is the WACC formula?
The standard formula is WACC = (E/V) × rE + (D/V) × rD × (1 - t), where E is equity value, D is debt value, V is total capital, rE is cost of equity, rD is cost of debt, and t is the corporate tax rate.
When should I use WACC?
Use WACC as the discount rate in DCF valuation when cash flows represent the entire firm (FCFF). It is also used for capital budgeting, investment decisions, and setting hurdle rates.
What is a good WACC?
A “good” WACC depends on the industry, risk level, and market conditions. Lower WACC generally indicates cheaper financing and higher firm value, but it should always be compared to returns on investment or project IRR.
WACC vs discount rate: what is the difference?
WACC is a specific type of discount rate based on a company’s capital structure and cost of financing. A discount rate is a broader concept and can be adjusted above or below WACC depending on project risk.
What are common WACC calculation mistakes?
Common mistakes include using book instead of market values, applying inconsistent tax rates, mixing cash flow types (FCFF vs FCFE), and ignoring preferred stock when it is significant.
How do I estimate cost of equity for WACC?
The most common method is CAPM: rE = rf + β × (rm − rf). Use the current risk-free rate (e.g. the 10-year government bond yield), an equity risk premium (typically 4.5%–6% for developed markets), and the company's beta. Beta measures how much the stock moves relative to the broader market — a beta above 1 means higher systematic risk than the market average.
Why use market values rather than book values in WACC?
Market values reflect what investors would pay today and the current cost of raising capital. Book values are historical accounting figures and do not represent the actual price of equity or debt in the current market. Using book values can significantly distort the capital structure weights and produce an inaccurate WACC.
Can you show a simple WACC calculation example?
Yes. Equity = $700,000, debt = $300,000, cost of equity = 10%, pre-tax cost of debt = 6%, tax rate = 25%. Weights: E/V = 0.70, D/V = 0.30. After-tax cost of debt = 6% × (1 − 0.25) = 4.5%. WACC = (0.70 × 10%) + (0.30 × 4.5%) = 7% + 1.35% = 8.35%.
How does leverage affect WACC?
Adding more debt initially lowers WACC because debt is cheaper than equity and the interest tax shield reduces the after-tax cost. However, higher leverage increases financial risk, which eventually pushes up the cost of equity and debt. The trade-off means WACC often reaches a minimum at a moderate level of leverage, not at maximum debt.
What is the difference between WACC and hurdle rate?
WACC is the company-wide average cost of capital. A hurdle rate is the minimum return required for a specific project or investment and may differ from WACC if the project carries more or less risk than the company as a whole. WACC is often used as the starting point for setting hurdle rates, but riskier projects warrant a higher rate.
What are typical WACC values by industry?
WACC varies widely by industry and market conditions. Capital-intensive, regulated industries such as utilities and real estate typically see WACC of 5%–9%, while higher-risk sectors such as technology and biotech often see WACC of 8%–14% or more. These ranges shift as interest rates and equity risk premiums change.
