WACC Calculator

WACC (Weighted Average Cost of Capital) is the blended rate a company is expected to pay across all its sources of financing — equity and debt. It represents the minimum return a company must earn on its existing assets to satisfy its investors and creditors. It is widely used as the discount rate in discounted cash flow (DCF) valuation models.

WACC = (E / (D + E)) × rE + (D / (D + E)) × rD × (1 − t), where E is total equity, D is total debt, rE is the cost of equity, rD is the cost of debt, and t is the corporate tax rate. The debt component is multiplied by (1 − t) to reflect the tax deductibility of interest payments.

Interest payments on debt are tax-deductible in most jurisdictions, which effectively reduces the true cost of debt financing. Multiplying the cost of debt by (1 − tax rate) gives the after-tax cost of debt, making the WACC a more accurate reflection of the company's actual financing cost.

The most common method is the Capital Asset Pricing Model (CAPM): rE = Risk-Free Rate + Beta × (Market Return − Risk-Free Rate). The risk-free rate is typically the yield on government bonds, and beta measures how volatile a company's stock is relative to the overall market.

WACC calculations should ideally use market values rather than book values. Market value of equity is shares outstanding multiplied by the current share price. Market value of debt can be approximated by the present value of future debt cash flows, though book value is often used as a practical substitute for debt.

There is no universal 'good' WACC — it varies significantly by industry, company size, and capital structure. A lower WACC means cheaper financing and typically a higher company valuation. As a rough benchmark, many publicly traded companies have WACCs ranging from 7% to 12%, though capital-intensive or riskier industries can see higher figures.

Since debt is usually cheaper than equity (and interest is tax-deductible), increasing the proportion of debt in the capital structure can lower WACC up to a point. However, too much debt increases financial risk and can raise both the cost of equity and the cost of debt, ultimately increasing WACC. The optimal capital structure balances these trade-offs.

In a Discounted Cash Flow (DCF) analysis, WACC is used as the discount rate to convert a company's future free cash flows into their present value. A lower WACC results in a higher estimated company value. WACC is also used as a hurdle rate — projects with returns above the WACC are considered value-creating.