WACC (Weighted Average Cost of Capital) is the blended rate a company must earn on its existing assets to satisfy its investors. In DCF valuation, WACC is used as the discount rate — future cash flows are divided by (1 + WACC) each year to calculate their present value.

How do you calculate WACC?

WACC = (E/V × Cost of Equity) + (D/V × Cost of Debt × (1 − Tax Rate)), where E = market cap, D = total debt, V = E + D. Cost of equity is typically calculated using CAPM: Risk-Free Rate + Beta × Equity Risk Premium.

What is a typical WACC for US stocks?

Most US large-cap stocks have a WACC between 7% and 12%. Stable mega-cap companies (Apple, Microsoft) typically have WACC around 8–10%. Smaller, riskier companies or those with high leverage typically have WACC of 10–12%.

What is the risk-free rate for WACC?

The risk-free rate is typically the 10-year US Treasury bond yield, which is approximately 4.3% in 2025. It represents the return an investor can earn with zero risk, which forms the baseline of the cost of equity in CAPM.

What is equity risk premium (ERP)?

The equity risk premium (ERP) is the additional return investors expect over the risk-free rate for investing in stocks. Damodaran estimates the US ERP at approximately 5.5% for 2025. Multiplied by a stock's beta, it gives the extra return required above the risk-free rate.

How does beta affect WACC?

Beta measures a stock's price volatility relative to the overall market. A beta of 1.0 means the stock moves with the market; higher beta means more volatile. Higher beta → higher cost of equity → higher WACC → lower intrinsic value from DCF. A beta of 1.5 vs 0.8 can change WACC by 2–4 percentage points.

Guide · Cost of Capital

WACC Calculator — Weighted Average Cost of Capital

WACC is the discount rate used in DCF models. It represents the blended cost of financing a business — combining the cost of equity and the after-tax cost of debt, weighted by capital structure. A higher WACC means future cash flows are worth less today, producing a lower intrinsic value.

What is WACC?

WACC (Weighted Average Cost of Capital) is the minimum return a company must earn on its invested capital to satisfy both equity investors and debt holders. It blends the cost of equity — what shareholders expect as a return — with the after-tax cost of debt — what it costs to service the company's borrowings.

In a DCF model, WACC serves as the discount rate: each year's projected free cash flow is divided by (1 + WACC)^tto bring it back to today's present value. The higher the WACC, the more aggressively future cash flows are discounted — and the lower the resulting intrinsic value per share.

The WACC formula

WACC Formula

WACC = (E/V × Re) + (D/V × Rd × (1 − Tax Rate))

E = Market capitalization (equity value)

D = Total debt

V = E + D (total capital)

Rₑ = Cost of equity (from CAPM)

R_d = Cost of debt (interest expense / total debt)

Tax Rate = Effective corporate tax rate (typically ~21% for US companies)

How to calculate cost of equity (CAPM)

The Capital Asset Pricing Model (CAPM) is the standard approach for calculating the cost of equity — what return equity investors expect for bearing the stock's risk.

CAPM Formula

Re = Rf + β × ERP

Rf = Risk-free rate — 10-year US Treasury (~4.3% in 2025)

β = Beta — stock price sensitivity vs. market (1.0 = moves with market)

ERP = Equity risk premium (~5.5% for US market, per Damodaran 2025)

Example: A stock with β = 1.2 → Re = 4.3% + 1.2 × 5.5% = 10.9% cost of equity. A stable mega-cap with β = 0.8 → Re = 4.3% + 0.8 × 5.5% = 8.7% cost of equity.

How to calculate cost of debt

The after-tax cost of debt is simpler than cost of equity. Find the effective interest rate from financial statements and apply the tax shield:

After-tax Rd = (Interest Expense / Total Debt) × (1 − Tax Rate)

Debt interest is tax-deductible, making debt financing cheaper than equity. This is called the tax shield. For a company with 5% gross interest rate and 21% tax rate: after-tax cost of debt = 5% × (1 − 0.21) = 3.95%.

Typical WACC ranges by sector

Sector	Typical WACC range	Why
Technology	8–11%	High beta, growth premium, low debt
Healthcare	8–10%	Moderate beta, regulatory risk
Consumer Staples	7–9%	Low beta, predictable cash flows
Financials	9–12%	Leverage risk, regulatory capital requirements
Energy	8–11%	Commodity price volatility, capital intensity
Utilities	7–9%	Very low beta, regulated, predictable earnings
Mega-cap (>$1T)	max ~10%	Low beta, fortress balance sheet, low risk

How WACC affects stock valuation

WACC is the most powerful lever in a DCF model. Small changes in WACC can produce dramatically different intrinsic value estimates — this is one reason why two analysts using the same financial statements can produce very different price targets.

WACC Sensitivity (illustrative)

WACC	Implied intrinsic value (relative)	Interpretation
7%	~$150	Low-risk mega-cap (e.g. Berkshire, JNJ)
9%	~$115	Large-cap, moderate risk baseline
11%	~$88	Mid-cap or leveraged company
13%	~$70	Small-cap or high-debt company

Based on illustrative FCF projections. Values shown relative to a baseline — actual intrinsic value depends on the company's FCF.

Bottom-up beta vs raw beta

Raw market beta — calculated directly from historical price returns — is noisy. It reflects recent volatility rather than fundamental business risk, and it changes significantly over short periods.

The Damodaran approach uses bottom-up beta: take the average unlevered beta for the company's industry, then re-lever it based on the company's actual debt-to-equity ratio. This produces a more stable, fundamentally-grounded beta that is less sensitive to short-term market noise.

WACC adjustments pocketDCF applies

pocketDCF's engine goes beyond raw CAPM to apply institutional-grade WACC calibration:

Leverage penalty: Companies with high Net Debt/EBITDA ratios get a WACC uplift to reflect increased financial risk
Size penalty: Smaller market cap companies get a size premium added to their WACC (illiquidity and operational risk)
Quality bonus: Companies with high ROIC and consistent FCF get a WACC reduction to reflect lower fundamental risk
Mega-cap cap: For companies with market cap > $1T, WACC is capped at 10% — reflecting the inherent stability of fortress-balance-sheet businesses
Beta clamping: Raw beta is clamped between 0.8–1.5 to prevent extreme WACC values from noisy market data

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