Introduction
The Weighted Average Cost of Capital (WACC) is a key number in corporate finance. It tells you the average rate a company pays to fund its operations, combining the cost of both debt and equity. Think of it as the minimum return a company must earn on its investments to keep its investors happy. Lenders and shareholders each expect a certain return, and WACC blends those expectations into one useful percentage.
This WACC Calculator makes it easy to find that number. Just enter the cost of equity, cost of debt, tax rate, and the amounts of debt and equity in your capital structure. The calculator does the math for you in seconds. Business owners, students, and analysts use WACC to evaluate new projects, compare investment options, and figure out if a company is creating or destroying value. A lower WACC means cheaper funding, which generally makes it easier for a business to grow and profit.
How to Use Our WACC Calculator
Enter your company's capital structure and cost details below to calculate the Weighted Average Cost of Capital (WACC). This is the average rate a company pays to finance its assets, weighted by each source of capital.
Equity Market Value ($): Enter the total market value of the company's equity. This is found by multiplying the current stock price by the total number of shares outstanding.
Debt Market Value ($): Enter the total market value of the company's debt. This includes all outstanding bonds, loans, and other forms of borrowed money the company owes.
Cost of Equity (%): Enter the rate of return that shareholders expect to earn on their investment. You can find this using the Capital Asset Pricing Model (CAPM) or the Dividend Discount Model. If you use the dividend approach, our Dividend Calculator can help you estimate expected dividend payments.
Cost of Debt (%): Enter the interest rate the company pays on its borrowed money. This is the average interest rate across all of the company's debt obligations.
Corporate Tax Rate (%): Enter the company's tax rate. This is important because interest payments on debt are tax-deductible, which lowers the true cost of debt. This tax benefit is called the tax shield.
Once you fill in all the fields, the calculator will return your WACC as a percentage. A lower WACC means the company pays less to finance its operations, while a higher WACC means financing costs are greater. Businesses use WACC as a hurdle rate to decide whether new projects or investments are worth pursuing.
What Is WACC?
WACC stands for Weighted Average Cost of Capital. It tells a company how much it costs, on average, to raise money. Companies get money from two main sources: debt (like loans and bonds) and equity (like selling shares of stock). Each source has its own cost, and WACC blends them together into one single number based on how much of each the company uses.
Why Does WACC Matter?
WACC is one of the most important numbers in corporate finance. Companies use it as a hurdle rate — meaning any new project or investment should earn a return higher than the WACC. If a project earns less than the WACC, the company is actually losing value by pursuing it. Investors also use WACC to value companies by discounting future cash flows back to today's dollars. For example, real estate investors rely on a similar concept when they use the Cap Rate Calculator to evaluate whether a property investment meets their required return threshold.
How Is WACC Calculated?
The WACC formula is:
WACC = (E/V × Cost of Equity) + (D/V × Cost of Debt × (1 − Tax Rate))
- E = Market value of equity
- D = Market value of debt
- V = Total value (E + D)
- Cost of Equity = The return shareholders expect for investing in the company
- Cost of Debt = The interest rate the company pays on its borrowings
- Tax Rate = The corporate tax rate, which matters because interest payments on debt are tax-deductible
Notice that debt gets a tax benefit. When a company pays interest on a loan, it can deduct that interest from its taxes. This makes debt cheaper than it looks on the surface. That is why we multiply the cost of debt by (1 − Tax Rate).
What Is a Good WACC?
There is no single "good" WACC. It depends on the industry, the company's risk level, and current market conditions. A stable utility company might have a WACC around 4–6%, while a risky tech startup could have a WACC of 15% or higher. In general, a lower WACC means the company can raise money more cheaply, which makes it easier to find profitable investments.
Key Things to Remember
- WACC uses market values, not book values, for the weights of debt and equity.
- The cost of equity is usually estimated using the Capital Asset Pricing Model (CAPM). Equity investors also look at metrics like dividend yield to gauge expected returns.
- A company that takes on more debt may lower its WACC at first because debt is cheaper than equity — but too much debt increases financial risk and can raise both costs. Understanding how debt payments work is crucial, and tools like our Auto Loan Calculator illustrate how interest costs are structured on borrowed funds.
- WACC is a forward-looking measure. It reflects what it would cost the company to raise new capital today, not what it paid in the past.
- When comparing annual yields on different investments or savings vehicles, the APY Calculator can help you understand the effect of compounding on returns.
- Businesses also track metrics like customer acquisition cost and customer lifetime value alongside WACC to make sure their growth investments are generating returns above the cost of capital.
Frequently Asked Questions
What does WACC stand for?
WACC stands for Weighted Average Cost of Capital. It is the average rate a company pays to fund its operations using both debt and equity. Each source of money is weighted by how much of it the company uses.
What inputs do I need to use this WACC calculator?
You need five inputs:
- Total Equity Value (E) — the market value of the company's equity
- Total Debt Value (D) — the market value of the company's debt
- Cost of Equity (Re) — the return shareholders expect
- Cost of Debt (Rd) — the interest rate paid on debt
- Corporate Tax Rate (Tc) — the company's income tax rate
What is the CAPM feature in this calculator?
CAPM stands for Capital Asset Pricing Model. It is a method to estimate the cost of equity. The calculator has a built-in CAPM panel where you enter the risk-free rate, beta, and expected market return. It then computes the cost of equity using the formula: Re = Rf + β × (Rm − Rf). This value automatically fills in the Cost of Equity field.
What is beta in the CAPM calculation?
Beta measures how much a stock's price moves compared to the overall market. A beta of 1 means the stock moves in line with the market. A beta above 1 means the stock is more volatile, and a beta below 1 means it is less volatile. Higher beta leads to a higher cost of equity.
What is the risk-free rate?
The risk-free rate is the return you can earn on an investment with virtually no risk. It is usually based on the yield of a 10-year government bond, such as U.S. Treasury bonds. This rate serves as the baseline for calculating the cost of equity using CAPM.
Can I solve for a missing variable instead of WACC?
Yes. Enter a target WACC in the optional WACC field and leave one other field blank. The calculator will solve for that missing variable. For example, you can find the required cost of equity or debt amount needed to hit a specific WACC target.
Why is the cost of debt multiplied by (1 − Tax Rate)?
Interest payments on debt are tax-deductible. This means the government effectively pays part of the interest cost through tax savings. Multiplying by (1 − Tax Rate) adjusts the cost of debt to reflect this tax benefit, which is called the tax shield.
What is the difference between the equity component and the debt component in the results?
The equity component is the portion of WACC that comes from equity financing. It equals the equity weight (E/V) times the cost of equity. The debt component is the portion from debt financing. It equals the debt weight (D/V) times the after-tax cost of debt. Adding them together gives you the total WACC.
Should I use market values or book values for equity and debt?
You should use market values. Market value of equity is the current stock price times the number of shares outstanding. Market value of debt is the current trading value of bonds and loans. Book values from financial statements do not reflect what investors would actually pay today.
What does the sensitivity analysis feature do?
The sensitivity analysis shows how WACC changes when you adjust two variables at the same time. You pick a row variable and a column variable, set the number of steps and step size, and the calculator builds a table and heatmap showing WACC at every combination. This helps you see which inputs have the biggest impact on WACC.
What is a typical WACC range?
WACC varies widely by industry and risk level. Stable, low-risk companies like utilities often have a WACC between 4% and 6%. Growth companies or riskier firms might have a WACC of 10% to 15% or higher. There is no single correct number — it depends on the company's capital structure, industry, and market conditions.
How does adding more debt affect WACC?
Adding debt can initially lower WACC because debt is usually cheaper than equity due to the tax shield. However, taking on too much debt increases financial risk. Lenders may charge higher interest rates, and equity investors may demand higher returns. At some point, adding more debt will start to raise WACC instead of lowering it.
What does the donut chart show?
The donut chart shows the capital structure of the company. It displays the proportion of total value that comes from equity versus debt. This gives you a quick visual of how the company is financed.
Can I change the currency in the calculator?
Yes. Use the Currency Display dropdown at the top to switch between USD ($), EUR (€), GBP (£), JPY (¥), INR (₹), CAD (C$), and AUD (A$). This changes the currency symbol shown in the results but does not convert values.
What happens if I manually edit the cost of equity after using CAPM?
If the CAPM panel is open and you manually change the Cost of Equity field, the calculator marks CAPM as overridden. The CAPM panel will dim and show a message indicating that your manual entry is being used instead of the CAPM result. To go back to CAPM, just edit any CAPM input (risk-free rate, beta, or market return).
What is the after-tax cost of debt?
The after-tax cost of debt is the effective interest rate a company pays after accounting for the tax deduction on interest. It is calculated as Cost of Debt × (1 − Tax Rate). For example, if the cost of debt is 8% and the tax rate is 20%, the after-tax cost of debt is 8% × 0.80 = 6.40%.
Why is WACC used as a discount rate?
WACC represents the minimum return a company must earn to satisfy all its investors. When analysts value a company using discounted cash flow (DCF) analysis, they use WACC to discount future cash flows back to their present value. If a project earns more than the WACC, it adds value. If it earns less, it destroys value.
What if my equity value or debt value is zero?
If equity is zero, the company is funded entirely by debt, and WACC equals the after-tax cost of debt. If debt is zero, the company is funded entirely by equity, and WACC equals the cost of equity. The calculator handles both cases, but you cannot solve for certain variables (like cost of equity) when equity is zero.