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.