Firm Value Calculator (WACC Method)

An expert tool for calculating firm value using WACC based on the Discounted Cash Flow (DCF) model.

WACC Calculation Inputs

Firm Value Calculation Inputs

What is Calculating Firm Value Using WACC?

Calculating firm value using WACC (Weighted Average Cost of Capital) is a fundamental financial valuation technique. It falls under the Discounted Cash Flow (DCF) model, specifically the entity method, which aims to determine a company’s total worth, also known as its Enterprise Value. This value represents the combined market value of its equity and debt, less any cash on its balance sheet.

The core principle is to project the company’s future Free Cash Flow to the Firm (FCFF) and then discount those cash flows back to their present value. The discount rate used for this process is the WACC. FCFF represents the cash generated by a company’s operations that is available to all its capital providers—both equity shareholders and debtholders. The WACC, in turn, represents the blended, average rate of return the company must earn to satisfy these same providers. If a company’s investments generate returns higher than its WACC, it creates value.

This method is widely used by investors, financial analysts, and corporate managers to assess acquisition targets, evaluate strategic projects, and understand the intrinsic value of a business. A proper understanding of the WACC formula is crucial for accurate valuation.

The Formulas for WACC and Firm Value

The valuation process involves two key formulas. First, you must calculate the WACC, and then you use that result to calculate the firm’s value.

WACC Formula

The WACC is the weighted average of the cost of equity and the after-tax cost of debt.

WACC = (E/V × Re) + (D/V × Rd × (1 – Tc))

WACC Formula Variables

Variable	Meaning	Unit	Typical Range
E	Market Value of Equity	Currency ($)	Varies
D	Market Value of Debt	Currency ($)	Varies
V	Total Market Value of Firm (E + D)	Currency ($)	Varies
Re	Cost of Equity	Percentage (%)	5% – 20%
Rd	Cost of Debt	Percentage (%)	3% – 9%
Tc	Corporate Tax Rate	Percentage (%)	15% – 35%

Firm Value Formula (Perpetuity Growth Model)

Once WACC is known, you can calculate the firm’s value using the Gordon Growth Model, which assumes the company’s free cash flows grow at a stable rate forever.

Firm Value = FCFF₁ / (WACC – g)

Where FCFF₁ is the Free Cash Flow to the Firm expected in the next year (or FCFF₀ × (1 + g)).

Firm Value Formula Variables

Variable	Meaning	Unit	Typical Range
FCFF₁	Free Cash Flow to Firm next year	Currency ($)	Varies
WACC	Weighted Average Cost of Capital	Percentage (%)	5% – 15%
g	Perpetual Growth Rate of FCFF	Percentage (%)	1% – 4%

Practical Examples

Example 1: Stable, Mature Company

Imagine a well-established manufacturing company. It’s stable but has low growth prospects.

• Inputs:
  • Market Value of Equity (E): $1,200,000
  • Market Value of Debt (D): $800,000
  • Cost of Equity (Re): 9%
  • Cost of Debt (Rd): 4%
  • Tax Rate (Tc): 21%
  • Free Cash Flow to Firm (FCFF): $150,000
  • Perpetual Growth Rate (g): 2%
• Calculation Steps:
  1. Calculate WACC: WACC = (1.2M/2M * 9%) + (0.8M/2M * 4% * (1 – 0.21)) = 5.4% + 1.26% = 6.66%
  2. Calculate Firm Value: Firm Value = ($150,000 * (1 + 0.02)) / (0.0666 – 0.02) = $153,000 / 0.0466 = $3,283,261

Example 2: Tech Growth Company

Now consider a young technology firm with higher risk and growth expectations. Exploring the CAPM model helps determine its higher cost of equity.

• Inputs:
  • Market Value of Equity (E): $3,000,000
  • Market Value of Debt (D): $500,000
  • Cost of Equity (Re): 15%
  • Cost of Debt (Rd): 6%
  • Tax Rate (Tc): 25%
  • Free Cash Flow to Firm (FCFF): $200,000
  • Perpetual Growth Rate (g): 4%
• Calculation Steps:
  1. Calculate WACC: WACC = (3M/3.5M * 15%) + (0.5M/3.5M * 6% * (1 – 0.25)) = 12.86% + 0.64% = 13.5%
  2. Calculate Firm Value: Firm Value = ($200,000 * (1 + 0.04)) / (0.135 – 0.04) = $208,000 / 0.095 = $2,189,473

How to Use This Firm Value Calculator

Using this calculator is a straightforward process:

1. Enter WACC Inputs: Start by filling in the fields under “WACC Calculation Inputs.” These include the market values of equity and debt, the costs associated with each, and the corporate tax rate.
2. Enter Firm Value Inputs: Next, provide the current Free Cash Flow to the Firm (FCFF) and your assumed perpetual growth rate (g).
3. Review Intermediate Results: The calculator automatically shows you the calculated WACC, the company’s total capital, and the effective after-tax cost of its debt. This is a great way to check the individual components.
4. Analyze Capital Structure: The pie chart provides an instant visual of the company’s capital mix—how much is funded by equity versus debt.
5. Interpret the Final Result: The primary highlighted result is the estimated Firm Value. This is the total value of the company based on the inputs provided. Understanding the difference between equity value vs enterprise value is key to proper interpretation.

Key Factors That Affect Firm Value

Several key variables directly influence a firm’s valuation. Understanding these drivers is essential for anyone performing a business valuation.

• Free Cash Flow to Firm (FCFF): This is the most direct driver. Higher and more stable cash flows lead to a higher valuation.
• Perpetual Growth Rate (g): A higher sustainable growth rate increases the terminal value, thus boosting the overall firm value. However, this must be a realistic, long-term rate. Our guide to growth rate assumptions can help.
• Cost of Equity (Re): A higher cost of equity, often due to higher perceived risk (beta), increases the WACC and lowers the firm’s value.
• Cost of Debt (Rd): Lower borrowing costs reduce the WACC, which in turn increases the firm value.
• Corporate Tax Rate (Tc): Because interest on debt is tax-deductible, a higher tax rate slightly increases the value of the “tax shield” from debt, which can marginally lower the WACC.
• Capital Structure (Debt/Equity Mix): Since debt is typically “cheaper” than equity (due to lower risk and tax shields), adding debt can initially lower the WACC and increase value. However, too much debt increases financial risk, which will eventually raise both the cost of debt and equity, increasing WACC.

Frequently Asked Questions (FAQ)

1. What is a good WACC?

A “good” WACC is relative and depends on the industry, company size, and market conditions. Generally, a lower WACC is better, as it means the company can create value more easily. A mature utility company might have a WACC of 5-7%, while a tech startup could be 15% or higher.

2. Why can’t the growth rate (g) be higher than WACC?

Mathematically, if ‘g’ were greater than WACC, the denominator in the firm value formula would be negative, implying an infinite negative value. Economically, it’s impossible for a company to grow faster than its cost of capital forever, as it would eventually become larger than the entire economy.

3. What’s the difference between Firm Value and Equity Value?

Firm Value (or Enterprise Value) is the value of the entire company to all stakeholders (debt and equity). Equity Value is the value belonging only to shareholders. To get from Firm Value to Equity Value, you subtract the market value of debt and add back cash. A deep dive is available in our article on what is DCF valuation.

4. Where do I find the inputs for this calculator?

For public companies, market value of equity is the stock price times shares outstanding. Debt can be found on the balance sheet. Cost of equity often requires the CAPM model. Cost of debt is the yield on its bonds or interest on loans. Tax rates are in financial reports. Check our guide on understanding financial statements.

5. How does debt affect firm value?

Debt introduces a tax shield because interest payments are tax-deductible, which lowers the WACC and can increase firm value (up to a point). However, too much debt increases bankruptcy risk, which will raise the cost of both debt and equity, ultimately lowering value.

6. Is a higher firm value always better?

Generally, yes. A higher firm value indicates a more profitable and efficient company that generates strong cash flows. However, the value is only as good as the assumptions used to calculate it.

7. What are the limitations of this valuation model?

The model is highly sensitive to assumptions, especially the perpetual growth rate (g) and WACC. It works best for stable, mature companies. It may be less accurate for startups or companies in rapidly changing industries.

8. How do you calculate the Cost of Equity?

The most common method is the Capital Asset Pricing Model (CAPM). The formula is: Cost of Equity = Risk-Free Rate + Beta * (Market Risk Premium). Learn more with our guide to calculating cost of equity.