Most investors look at revenue. Or earnings. Or the stock price.
But there's one number that tells you more about a company's real health than almost any other: free cash flow.
Free cash flow is the real cash a business makes after it pays for everything it needs to keep running and growing. Not profits on paper. Not guesses about the future. Actual cash.
It's the money a company could hand to its owners, use to pay off debt, buy back stock, or put back into the business. Warren Buffett calls this "owner's earnings" - and it's how he thinks about what a company is truly worth. (Buffett also uses a concept called a moat to judge whether a company can protect those cash flows over time.)
This article covers what free cash flow is, how to find it, why it matters for your portfolio, and how the pros use it to value stocks.
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How Free Cash Flow Works
Think of it like running a lemonade stand.
You sell $1,000 worth of lemonade in a month. That's your revenue. But you also spent $400 on lemons, sugar, and cups. And you spent $200 on a new blender and some signs.
After all of that, you have $400 left in real cash. That's your free cash flow.
For a real company, the math works the same way - just with bigger numbers. Let's break it down.
Revenue is the total money a company brings in from selling its stuff. For Home Depot, that was about $157 billion in a recent year.
Costs to run the business include things like salaries, marketing, and rent. Home Depot spent about 18% of its revenue on these costs. (These show up on the income statement, which tracks a company's revenue and expenses.)
CapEx - short for capital spending - is the money a company spends to keep the lights on and grow. For Home Depot, that means opening new stores and buying new gear. They spent about $3 billion a year on CapEx.
Free cash flow is what's left after you take out both the costs to run the business and the CapEx.
The Free Cash Flow Formula
Here's the simple version:
Free Cash Flow = Cash From the Business - Capital Spending
Cash from the business is the money a company makes from its core work. You can find it on the cash flow statement - one of three key reports every public company files with the SEC.
The other two are the balance sheet (what a company owns and owes) and the income statement (revenue and profit).
The cash flow report is special. It shows real cash moving through the business - not paper numbers. As one pro analyst put it: "There's a lot you can do on the income report to make earnings look like whatever you want. But the cash flow report is much harder to fake."
That's why many investors trust free cash flow more than earnings. Earnings can be tweaked. Cash is cash. (For a different way to look at earnings, check out our guide on what is EBITDA.)
Why Free Cash Flow Matters
Free cash flow tells you what a company can actually do with its money.
A company with strong free cash flow has options. It can pay dividends - regular cash sent to people who own shares. It can buy back its own stock, which can push the price up. It can pay off debt. Or it can put money into growth.
Home Depot is a great case. In a recent year, they made over $16 billion in cash from running the business. After spending about $2.6 billion on CapEx, they had roughly $14 billion in free cash flow.
What did they do with it? They paid billions in dividends and bought back billions in stock - giving that cash right back to the people who owned shares.
That's the power of free cash flow. It's the cash that belongs to the owners of the business. And if you own shares of a stock, you're one of those owners. (Not sure what that means? Here's our guide on what is a shareholder.)
Companies with growing free cash flow over time are usually healthy. They can handle downturns, jump on new chances, and reward the people who own shares.
Companies with shrinking or negative free cash flow might be in trouble - even if revenue looks good on paper.
How the Pros Use Free Cash Flow
Pro investors use free cash flow to figure out what a company is really worth. The most common way is called a DCF - or discounted cash flow model.
Here's the core idea: a company is worth the total cash it will make in the future, adjusted for the fact that money today is worth more than money later.
Why? If someone gave you $100 today or $100 a year from now, you'd take it today. You could invest that $100 and have more than $100 in a year.
A DCF takes all the free cash flow a company is expected to make in the future and "discounts" it back to what it's worth right now. Then you add it all up.
If that total is higher than the stock price, the stock might be a good deal. If it's lower, the stock might cost too much. (For more on how to think about this, read when to buy a stock.)
Here's a quick example. Say a made-up company called TechCorp made $100 million in free cash flow last year:
- You think it will grow that cash flow by 15% a year for 5 years.
- You use a 10% discount rate to account for risk.
- Year 1: $115 million in free cash flow, worth about $104.5 million in today's dollars.
- Year 2: $132 million, worth about $109.1 million today.
Add up all those numbers - plus a "terminal value" for all the cash after year 5 - and you get a total value. Split that by the number of shares, and you get a price per share.
If TechCorp trades at $100 and your model says it's worth $150, it might be cheap.
One thing to keep in mind: A DCF is only as good as your guesses. If you're too upbeat about growth, the model will say every stock is cheap. If you're too careful, every stock will look pricey.
That's why smart investors use it as a thinking tool - not a magic formula. (Another key metric pros use alongside DCF is enterprise value, which factors in both debt and cash.)
Free Cash Flow Yield
There's one more way investors use free cash flow: free cash flow yield.
This compares a company's free cash flow to its market cap - the total value of all its stock. It tells you how much cash flow you're getting for each dollar you put in.
Free Cash Flow Yield = Free Cash Flow / Market Cap
A higher number usually means you're getting more cash flow for your money. Think of it like a dividend yield, but based on the company's total free cash flow - not just the part it pays out.
Investors who build portfolios for income pay close attention here. A company can only keep paying dividends if it has enough free cash flow to cover them. Companies with decades of rising dividends - known as Dividend Kings - tend to have strong, steady free cash flow backing those payments.
If a company pays out more in dividends than it makes in free cash flow, that's a red flag. The dividend might not last.
Where to Find Free Cash Flow
You can find free cash flow in a company's public filings. Every public company files a 10-K (yearly report) and 10-Q (quarterly report) with the SEC.
Inside those filings, look for the cash flow report. It has three parts:
- Cash from the business - the cash made from day-to-day work.
- Cash from investing - money spent on new gear, buildings, or tech. This is where CapEx shows up.
- Cash from financing - how the company raises or returns money, like debt, dividends, and buybacks.
To get free cash flow, take cash from the business and subtract CapEx. That's it.
You can find these numbers for free on the company's website, the SEC website, or sites like Yahoo Finance. (If you're new to reading company filings, start with our guide on how to read a balance sheet.)
Why Free Cash Flow Beats Earnings
Revenue tells you how much a company sells. Earnings tell you the profit it reports. Free cash flow tells you how much real cash the business actually makes.
Why does that matter? A company can report strong earnings while burning through cash. Changes in what customers owe, how much inventory is on the shelf, and other working capital items can create a gap between paper profits and real cash.
The cash flow report shows all of this. It tracks the real flow of money in and out of the business.
That's why investors like Buffett focus on free cash flow. It cuts through the noise and shows you the real engine of a business. (For more ways pros measure company performance, check out return on equity.)
The Bottom Line
Free cash flow is one of the most useful numbers in all of investing.
It tells you how much real cash a business makes. It shows if a company can afford to pay dividends, buy back stock, or grow. And it's the base of how pros value companies.
Here's a good first step: the next time you look into a stock, check its free cash flow on the cash flow report. Compare it to the year before. Is it growing? That's usually a good sign.
Free cash flow won't tell you everything. But it tells you more about a company's real health than the stock price ever will.
Companies increase and decrease what they're spending money on all the time - as an investor, you need to be in the know.
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