The price of a stock is easy to find. It's plastered on every financial news site. But its value? That's a much harder question. Price is what you pay, but value is what you get. The goal of serious analysis is to figure out that value, which we call its intrinsic value. It's an estimate of a company's true worth, based on its ability to generate cash in the future.

While simple metrics like the P/E ratio offer a quick snapshot, they don't tell the whole story. To get a clearer picture, analysts use a more powerful tool: the Discounted Cash Flow (DCF) analysis. It's a cornerstone of modern finance and the closest thing we have to a fundamental valuation yardstick.

The core idea behind DCF is simple: a business is worth the sum of all the cash it can produce for its investors in the future. But because a dollar tomorrow is worth less than a dollar today, we have to "discount" those future cash flows to find their value in the present.

First, we need to define the cash we're measuring. We use something called Free Cash Flow (FCF), which represents the cash a company generates after covering all its operating expenses and investments. There are two main types:

• Free Cash Flow to the Firm (FCFF): This is the total cash flow available to all capital providers, both debt and equity holders. It's calculated before interest payments to lenders. This is the most common metric used in DCF because it lets us value the entire company's operations, regardless of how it's financed.
• Free Cash Flow to Equity (FCFE): This is the cash flow available only to equity holders, calculated after interest payments and net debt repayments. It's a more direct route to valuing the company's equity, but it can be trickier to use if the company's debt levels change a lot.

The first step in a DCF is to forecast these FCFF figures for a specific period, usually the next 5 or 10 years. This involves making educated guesses about the company's future revenue growth, profit margins, and investment needs.

Once we have our future cash flow estimates, we need a discount rate to bring them back to the present. If we're using FCFF, the standard discount rate is the Weighted Average Cost of Capital (WACC). The WACC represents the company's blended cost of capital from all sources, including debt and equity. Think of it as the average rate of return a company must pay to its investors for them to keep their money in the business.

Forecasting a company's financials for the next 5-10 years is hard enough. Forecasting them forever is impossible. To solve this, we split the DCF into two parts: the explicit forecast period and everything that comes after. The value of all cash flows beyond the forecast period is captured in a single number called the Terminal Value.

There are two common ways to calculate it:

1. Perpetuity Growth Model: This method assumes that after the forecast period, the company's free cash flows will grow at a slow, constant, and sustainable rate (g) forever. This growth rate should typically be no higher than the long-term growth rate of the overall economy.
2. Exit Multiple Method: This method assumes the company is sold at the end of the forecast period. We estimate the sale price by applying a valuation multiple (like EV/EBITDA) to the final year's projected earnings. This multiple is usually based on what similar companies are trading at today.

Once we calculate the Terminal Value, we discount it back to the present day, just like we did with the individual cash flows from the forecast period.

A DCF provides a single number for intrinsic value, but that number is built on a pile of assumptions. What if revenue growth is slower than expected? What if margins shrink? This is where Sensitivity Analysis comes in. By creating a table that shows how the intrinsic value changes with different assumptions for key drivers (like the WACC and the long-term growth rate), we can see a range of possible outcomes.

This is much more useful than a single point estimate. It helps us understand the key risks in the valuation.

Finally, it's wise to never rely on a single valuation method. Analysts compare the DCF result with other, simpler metrics called relative valuation multiples. These compare the company's value to a key statistic, like revenue or earnings. Common examples include:

• EV/EBITDA: Enterprise Value to Earnings Before Interest, Taxes, Depreciation, and Amortization.
• EV/Sales: Enterprise Value to Sales.

By comparing a company's multiples to those of its direct competitors, we can get a sense of whether it's priced cheaply or expensively relative to its peers. An analyst might create a "football field" chart to display the valuation ranges from the DCF, sensitivity analysis, and several relative multiples all on one graph. This helps triangulate a reasonable valuation range and avoid the trap of overpaying.

With a completed DCF analysis, you have a defensible estimate of what a business is truly worth. This provides a powerful benchmark to compare against the current market price, helping you make more informed investment decisions.