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WACC Calculator
Calculate the weighted average cost of capital for any company. Enter a ticker to auto-populate market cap, debt, and beta — or input your own assumptions. Use the result as your discount rate in a DCF model.
Inputs
Cost of Equity (CAPM)
Cost of equity (CAPM): 9.75% = 4.25% + 1× × 5.5%
Cost of Debt & Tax
Results
Enter market cap and debt to see WACC
Load a ticker for live data, or enter values manually. Results update instantly.
How to use this WACC calculator
Load a ticker or enter values manually
Type any US-listed ticker and click Load to auto-populate market cap, total debt, beta, and interest expense from live market data. Or enter your own assumptions for a custom capital structure analysis.
Review cost of equity via CAPM
Cost of equity = risk-free rate + beta x equity risk premium. Higher beta means higher cost of equity. The calculator uses the 10-year Treasury yield and a 5.5% equity risk premium as defaults.
Check cost of debt and tax rate
Cost of debt is estimated from interest expense / total debt. The tax shield reduces the effective cost. Verify the tax rate matches the company's effective rate from recent filings — it can differ significantly from the statutory 21%.
Use WACC as your DCF discount rate
The final WACC blends cost of equity and after-tax cost of debt by capital structure weights. Use this as the discount rate in your DCF model. Compare to sector benchmarks below — if your WACC is far outside the range, double-check inputs.
The WACC Formula, Step by Step
WACC = (E/V × Re) + (D/V × Rd × (1 − T))
Where E = market cap (equity value), D = total debt, V = E + D (total firm value), Re = cost of equity, Rd = pre-tax cost of debt, and T = the corporate tax rate. The formula weights each capital source by its proportion of total firm value, then sums them into a single blended rate.
Let's walk through a real example using Apple (AAPL). Apple has a market cap of roughly $3.4 trillion and total debt of about $100 billion. Total firm value is $3.5 trillion. Cost of equity via CAPM: risk-free rate of 4.5% + beta of 1.0 × equity risk premium of 5.5% = 10.0%. Apple's average interest rate on its bonds is approximately 3.5%, and the corporate tax rate is 21%.
Step 1 — Equity weight: E/V = 3,400 / 3,500 = 97.1%
Step 2 — Debt weight: D/V = 100 / 3,500 = 2.9%
Step 3 — After-tax cost of debt: 3.5% × (1 − 0.21) = 2.77%
Step 4 — WACC: (0.971 × 10.0%) + (0.029 × 2.77%) = 9.71% + 0.08% = 9.79%
Apple's WACC is about 9.8%. Because Apple is funded almost entirely by equity, its WACC is very close to its cost of equity. A company with 50% debt would see a larger gap between cost of equity and WACC, because the cheaper after-tax debt pulls the blended rate down.
What Discount Rate Should I Use for a DCF?
Use WACC. The discount rate in a DCF model should reflect the blended cost of all capital funding the business — not just equity, and not an arbitrary round number. Calculate WACC for the specific company you're valuing using the tool above, then plug that number directly into your DCF as the discount rate. For most large-cap US equities, WACC falls between 8% and 11%. Smaller or riskier companies will be higher — 11% to 14% is common.
A common shortcut is to use 10% for everything. That's fine for a quick sanity check, but it understates risk for volatile companies and overstates it for stable utilities. If your DCF conclusion changes dramatically when you move the discount rate by 1%, the thesis is fragile regardless of which rate you pick — use the sensitivity table in our DCF calculator to stress-test across a range.
5 Common WACC Mistakes
- Using book value of equity instead of market cap. Book equity is an accounting number that often bears no resemblance to what the market values a company at. Always use current market capitalization for the equity weight.
- Ignoring preferred stock. Companies with preferred shares have a third capital component with its own cost (the preferred dividend yield). Excluding it understates WACC for companies like banks and REITs that rely on preferred equity.
- Using the wrong risk-free rate. The risk-free rate in CAPM should be the 10-year Treasury yield, not the 3-month T-bill rate. The 10-year matches the long duration of equity cash flows. Using the short rate understates cost of equity by 1–2 percentage points.
- Assuming constant WACC for high-growth companies. A fast-growing company that is currently all-equity funded may take on significant debt as it matures. WACC will change as the capital structure evolves. For companies in transition, use a target capital structure rather than today's snapshot.
- Mixing nominal and real rates. If your cash flow projections are in nominal dollars (including inflation), your discount rate must also be nominal. Using a real (inflation-adjusted) discount rate with nominal cash flows will overstate present value. Keep both sides of the equation in the same terms.
WACC Ranges by Sector
WACC varies by sector because of differences in business risk (beta), leverage, and cost of debt. Use these ranges as a sanity check — if your calculated WACC falls far outside the range for the company's sector, revisit your inputs.
| Sector | Typical WACC |
|---|---|
| Technology | 8–12% |
| Utilities | 5–7% |
| Healthcare | 9–13% |
| Financials | 8–11% |
| Consumer Staples | 6–9% |
| Energy | 9–14% |
| Industrials | 7–11% |
| Real Estate | 6–9% |
When WACC Doesn't Work
WACC assumes a stable capital structure and positive cash flows — when those conditions don't hold, the number becomes unreliable. Early-stage companies with no debt and no earnings history make CAPM unreliable: beta is meaningless when the stock has limited trading history, and there's no debt component to blend in. Venture-style hurdle rates (20–40%) are more appropriate.
Companies with negative earnings create a different problem: CAPM may produce a cost of equity, but it doesn't reflect the real risk of a cash-burning business. And highly leveraged companies where the capital structure is changing rapidly — post-LBO, mid-restructuring, or during aggressive deleveraging — invalidate the static capital structure assumption. WACC calculated today may be irrelevant in 12 months. For these situations, use scenario-based discount rates or adjusted present value (APV), which values the tax shield separately from the unlevered business.
Understanding WACC
The discount rate that drives every DCF
WACC — weighted average cost of capital — is the blended rate a company pays to finance its operations through debt and equity. It answers a simple question: what minimum return must this business generate to satisfy everyone who funded it? Creditors want their interest. Shareholders want a return that compensates for the risk of owning equity instead of a Treasury bond. WACC combines both into a single number.
In a discounted cash flow model, WACC is the discount rate applied to projected free cash flows. A higher WACC means future cash flows are worth less today, producing a lower intrinsic value. A 1-percentage-point change in WACC can swing a stock's fair value by 10-20%, making it one of the most sensitive — and most debated — inputs in any valuation.
Cost of equity: what shareholders demand
Cost of equity is the return shareholders require to compensate for the risk of owning the stock instead of a risk-free asset. The Capital Asset Pricing Model (CAPM) estimates it as: Cost of Equity = Risk-Free Rate + Beta x Equity Risk Premium. The risk-free rate is typically the 10-year Treasury yield (~4.5%). The equity risk premium (ERP) is the additional return investors demand over Treasuries — historically 4.5-6% for US equities.
Beta measures a stock's sensitivity to market movements. A beta of 1.0 means the stock moves in line with the S&P 500. Above 1.0 means more volatile (higher cost of equity); below 1.0 means less volatile (lower cost of equity). Utilities often have betas of 0.4-0.6; tech stocks often have betas of 1.2-1.8. CAPM isn't perfect — it assumes markets are efficient and ignores company-specific risk — but it's the industry standard starting point.
Cost of debt: cheaper than equity, with a tax shield
Debt is almost always cheaper than equity because lenders have priority in bankruptcy and receive contractual interest payments regardless of business performance. The pre-tax cost of debt is the average interest rate a company pays on its borrowings. The effective (after-tax) cost is lower because interest payments are tax-deductible: After-Tax Cost of Debt = Pre-Tax Rate x (1 - Tax Rate).
At a 21% corporate tax rate, 5% pre-tax debt costs only 3.95% after tax. This tax shield is why companies use some debt — it lowers WACC and can increase equity returns. But the benefit has limits: too much debt raises bankruptcy risk, which increases both the cost of debt (credit spreads widen) and the cost of equity (beta rises). The optimal capital structure balances the tax shield against financial distress costs.
Capital structure: the debt-equity mix
Capital structure weights determine how much each cost component matters. A company funded 80% by equity and 20% by debt will have a WACC dominated by the cost of equity. A utility funded 50/50 will get a significant benefit from the cheaper debt component. The weights should use market values, not book values — market cap for equity, and market value of debt (which approximates book value for most investment-grade issuers).
Watch for companies with rapidly changing capital structures. A company that just completed a large acquisition funded by debt may have temporarily elevated leverage. Conversely, a company aggressively paying down debt will see its WACC shift over time. Use the current capital structure for a point-in-time WACC, and a target or normalized structure for a forward-looking estimate.
ROIC vs WACC: the value creation test
WACC is the hurdle rate. If a company's return on invested capital (ROIC) exceeds WACC, every dollar reinvested in the business creates value. If ROIC falls below WACC, growth actually destroys value — the company earns less than its cost of capital on each incremental investment. This is the single most important concept in corporate finance.
A company growing revenue at 20%/year with ROIC of 7% and WACC of 10% is destroying value with every dollar of growth. Conversely, a slow-growth company earning 25% ROIC against an 8% WACC creates enormous value because every retained dollar compounds at a high spread. The ROIC-WACC spread, not revenue growth, determines whether a business is truly worth more as it grows.
Common WACC mistakes to avoid
The most common mistake is using book value weights instead of market value weights. A company with $10B book equity but $50B market cap has very different capital structure weights depending on which you use. Always use market cap for equity weight.
Other pitfalls: using the statutory tax rate (21%) instead of the effective tax rate (which may be higher or lower due to foreign operations, tax credits, or deferred taxes); applying the same beta from five years ago without checking if the business has changed; and using WACC for projects with materially different risk profiles than the company overall. A utility company's WACC shouldn't be used to evaluate a speculative venture investment — each project needs a risk-appropriate discount rate.
WACC by Sector — Benchmarks
| Sector | Typical WACC Range |
|---|---|
| Technology | 9–11% |
| Utilities | 5–7% |
| Healthcare | 8–10% |
| Financials | 7–9% |
| Consumer Discretionary | 8–10% |
| Consumer Staples | 6–8% |
| Industrials | 7–9% |
| Energy | 8–11% |
| Real Estate | 6–8% |
| Materials | 8–10% |
Frequently asked questions
What is WACC?
WACC (weighted average cost of capital) is the blended rate a company pays to finance its operations through both debt and equity. It represents the minimum return a company must earn on its existing assets to satisfy its creditors, owners, and other providers of capital. WACC is used as the discount rate in DCF (discounted cash flow) analysis.
How do you calculate WACC?
WACC = (E/V × Re) + (D/V × Rd × (1 − T)), where E = market cap (equity value), D = total debt, V = E + D (total firm value), Re = cost of equity, Rd = cost of debt, and T = corporate tax rate. Cost of equity is typically calculated using CAPM: Re = risk-free rate + beta × equity risk premium.
What is a good WACC?
A good WACC depends on the industry. Utilities average ~5.8% due to stable regulated cash flows. Consumer Staples run ~7.2%, Financials ~8.2%, Industrials ~8.9%, Communication Services ~9.0%, Materials ~9.1%, Consumer Discretionary ~9.4%, Healthcare ~9.8%, Technology ~10.1%, Energy ~10.5%, and Biotech ~13.5%. The S&P 500 average is roughly 8.5%. A 'good' WACC for valuation is one that accurately reflects the company's risk — not one that's simply low. Use the sector comparison panel above to benchmark your result.
Why does WACC matter for stock valuation?
WACC is the discount rate in DCF models. A higher WACC means future cash flows are worth less today, producing a lower intrinsic value. A 1% change in WACC can swing intrinsic value by 10–20%, making it one of the most sensitive inputs in any valuation. Getting WACC right is critical — an optimistic discount rate will make any stock look cheap.
How does WACC affect DCF valuation?
WACC is used to discount projected free cash flows back to present value. Lower WACC = higher present value = higher intrinsic value per share. WACC also appears in the terminal value formula (Gordon Growth Model): Terminal Value = FCF × (1 + g) / (WACC − g). Since terminal value often represents 60–80% of total DCF value, even small changes in WACC have an outsized impact on the final number.
What is the WACC formula?
WACC = (E/V × Re) + (D/V × Rd × (1 − T)). E = market cap (equity value), D = total debt, V = E + D (total firm value), Re = cost of equity (estimated via CAPM), Rd = pre-tax cost of debt, and T = corporate tax rate. The formula weights each capital source by its proportion of total firm value, creating a blended required return.
What is CAPM and how does it estimate cost of equity?
CAPM (Capital Asset Pricing Model) estimates cost of equity as: Re = Risk-Free Rate + Beta × Equity Risk Premium. The risk-free rate is typically the 10-year Treasury yield (~4.5%). Beta measures a stock's volatility relative to the market — a beta of 1.2 means the stock is 20% more volatile than the S&P 500. The equity risk premium (4.5–6%) is the additional return investors demand for holding stocks over risk-free bonds.
Should I use book value or market value weights for WACC?
Always use market values. WACC represents the cost of capital at today's market prices, not historical accounting values. For equity, use current market capitalization. For debt, market value often approximates book value for investment-grade issuers, but for distressed companies or those with traded bonds, use the market price of the debt. Using book value weights can significantly misstate WACC, especially for companies where market cap has diverged from book equity.
What discount rate should I use for a DCF?
Use WACC — the weighted average cost of capital for the company you are valuing. WACC blends the cost of equity and after-tax cost of debt, weighted by the company's capital structure. For most large-cap US equities, WACC falls between 8% and 11%. Enter your specific company's inputs into a WACC calculator, then use the result as the discount rate in your DCF model.
What is the average WACC by industry?
WACC varies significantly by sector. Utilities typically have the lowest WACC at 5–7% due to stable regulated cash flows and cheap debt access. Technology companies range from 8–12% because of higher equity betas. Healthcare is 9–13%, Energy 9–14%, Consumer Staples 6–9%, Financials 8–11%, Industrials 7–11%, and Real Estate 6–9%. These ranges reflect differences in business risk, leverage, and cost of debt across industries.
What is the difference between WACC and cost of equity?
Cost of equity is the return shareholders require for holding a stock — estimated via CAPM as risk-free rate + beta × equity risk premium. WACC is broader: it blends cost of equity with the after-tax cost of debt, weighted by the company's capital structure. For an all-equity company with no debt, WACC equals cost of equity. For companies with debt, WACC is lower than cost of equity because debt is cheaper (interest is tax-deductible and lenders have priority in bankruptcy).