What Is Free Cash Flow? Why It Matters More Than Profit

Free cash flow is the cash a business generates after paying for everything needed to run and maintain it: operating cash flow minus capital expenditure. It is the money truly available to repay debt, pay dividends, buy back shares or reinvest. Because it measures real cash rather than accounting profit, it is harder to flatter and closer to what a business is actually worth to its owners.

Net income makes the headlines. Free cash flow decides whether a company can pay its bills, reward shareholders and survive a bad year. Once you learn to calculate it, you will read every earnings release differently.

Where this fits: free cash flow is used in three of the Five Criteria: cash conversion for Criterion 1, dividend cover for Criterion 4 and FCF yield for Criterion 5. It comes from the cash flow statement, covered in our hub, how to read financial statements.

What Is Free Cash Flow?

Free cash flow (FCF) = operating cash flow - capital expenditure.

Operating cash flow is the cash the core business produced during the year. Capital expenditure (capex) is the cash spent on equipment, buildings, software and other long-term assets. What is left over is “free” in the sense that the business does not need it to keep going.

Free cash flow does not appear as a line on the official statements. You calculate it yourself from two lines on the cash flow statement:

• Operating cash flow: labelled “net cash provided by operating activities” or “cash generated from operations”.
• Capital expenditure: labelled “purchases of property, plant and equipment” or similar, in the investing section. Include purchases of intangible assets such as capitalised software if the company reports them separately.

Many companies publish their own “free cash flow” figure in presentations. Always recalculate it. Having worked in investor relations, I know companies choose the definition that suits their story, and some leave out items you would want included.

How to Calculate Free Cash Flow: Company A

Company A is the hypothetical garden-tool maker used throughout our financial statements series. Figures are in millions of dollars.

Line	Amount
Net income	100
Operating cash flow	145
Capital expenditure	(50)
Free cash flow	95
Cash conversion (FCF / net income)	95%
Diluted shares	50 million
FCF per share	$1.90
Share price	$30
FCF yield (FCF / market value of 1,500)	6.3%

Three numbers matter most here: free cash flow itself, cash conversion and FCF yield. We will take each in turn.

Why Free Cash Flow Matters More Than Profit

Net income depends on accounting choices: how fast assets are depreciated, when revenue is recognised, what gets classed as a one-off. These choices are usually legitimate, but they give management room to shape the number.

Cash either arrived in the bank or it did not. That is why Warren Buffett, in his 1986 letter to Berkshire Hathaway shareholders, defined “owner earnings” as net income plus depreciation and other non-cash charges, minus the capital spending needed to maintain the business. Free cash flow is the practical, measurable cousin of owner earnings.

Consider Company C, a hypothetical capital-hungry manufacturer, that reports 200 of net income but must spend 180 a year just to keep its plants running. Its free cash flow is about 20. The income statement says it earns 200. The cash says it earns 20 and runs on an expensive treadmill of reinvestment.

Now compare a software company that earns 200 and spends 10 on capex. Its free cash flow is close to 200 or more. Same profit, very different businesses.

Cash Conversion: Are the Profits Real?

Cash conversion = free cash flow / net income.

Terry Smith of Fundsmith has written for years that he looks for companies that turn a high share of their reported profit into cash. It is one of the simplest tests of earnings quality there is.

Cash conversion (5-year average)	What it usually means
Above 100%	Excellent: profits are fully backed by cash
90% to 100%	Healthy: passes the Five Criteria test
70% to 90%	Needs an explanation: heavy capex or growing working capital
Below 70%	Warning: profits are not turning into cash

Real example: in fiscal 2023, Apple generated about $110 billion of operating cash flow and spent about $11 billion on capex, for free cash flow of roughly $99 billion against net income of about $97 billion. Cash conversion was just over 100%.

Always use a multi-year average. Capex and working capital are lumpy, and one year can mislead in either direction.

Free Cash Flow Yield: A Quick Valuation Check

FCF yield = free cash flow / market capitalisation (or FCF per share divided by share price).

Company A’s market value at $30 a share is 1,500. Its FCF of 95 gives an FCF yield of 6.3%. In plain terms, if you owned the whole company, it would produce 6.3% of your purchase price in cash this year, before any growth.

A higher FCF yield means a cheaper stock, or one the market expects to shrink. A lower yield means a pricier stock, or one the market expects to grow fast. Our Criterion 5 guide, price to free cash flow, shows how to use it alongside a discounted cash flow valuation.

Maintenance vs Growth Capex

Not all capex is equal. Maintenance capex keeps the business where it is. Growth capex expands it. Standard free cash flow subtracts both, which is conservative for fast-growing companies.

Companies rarely disclose the split. Two rough approaches:

• Use depreciation as a proxy for maintenance capex. Depreciation estimates how fast existing assets wear out. It is imperfect, especially with inflation, but it is a starting point.
• Look at capex in a slow-growth year. When a company is not expanding, most capex is maintenance.

Be careful. Management teams like to describe most spending as “growth”, because it makes underlying free cash flow look bigger. Stay sceptical unless revenue growth clearly backs up the claim.

When Negative Free Cash Flow Is Fine, and When It Is Not

Negative free cash flow is not automatically bad. A business with high returns on capital that is investing heavily to grow may show negative free cash flow for a while. Amazon, for example, reported negative free cash flow in 2021 and 2022 during a very large build-out of its logistics network.

The test is whether the spending earns a good return. Ask three questions:

1. Is operating cash flow positive and growing? If the core business burns cash, capex is not the problem.
2. Does the company have a track record of high returns on past investment? Check ROIC.
3. Is the spending funded from the balance sheet, or from new shares and debt?

Negative free cash flow that persists in a mature business, funded by borrowing, is one of the most reliable warning signs in stock analysis.

Free Cash Flow Traps to Watch

• Stock-based compensation. It is added back to operating cash flow as a non-cash cost, but it dilutes shareholders. For companies that pay heavily in stock, subtract it for a truer free cash flow.
• Stretched payables. Paying suppliers late boosts cash this year and reverses later.
• Capitalised costs. Moving normal expenses into capex flatters operating cash flow. Free cash flow still subtracts it, but watch for capex rising faster than the business.
• Acquisitions. Standard FCF excludes acquisitions. A company that “buys” its growth every year may have lower real free cash flow than it looks.
• Leases. Under IFRS 16, lease payments move to the financing section, lifting operating cash flow. Subtract lease payments to compare fairly with US companies.

How We Use This in the Five Criteria

• Criterion 1, great business: free cash flow of at least 90% of net income, on a multi-year basis. Company A: 95%, pass.
• Criterion 4, sound balance sheet: free cash flow must cover the dividend. Company A’s 95 covers its 40 dividend 2.4 times. A company paying out more than its free cash flow is borrowing to pay you. See how much debt is too much.
• Criterion 5, reasonable price: FCF yield of 5% or more, or a price at least 25% below a conservative intrinsic value. Company A at $30: 6.3%, pass.

Common Mistakes With Free Cash Flow

• Using management’s number without checking it. Recalculate from the statements.
• Looking at one year. Use a five-year average.
• Ignoring stock-based compensation in companies that pay heavily in shares.
• Treating all capex as growth capex to make the business look cheaper.
• Confusing EBITDA with free cash flow. EBITDA ignores capex, working capital and tax.

Your Next Step

Calculate five years of free cash flow and cash conversion for one company you own. Then see how free cash flow sets the price you should pay in price to free cash flow, or go back to the cash flow statement walkthrough to see where each number comes from.

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About the author: Cameron Hayes is a senior investor relations and finance professional who has worked in IR at Nasdaq Copenhagen-listed companies including Nilfisk and Maersk Drilling. He holds an MSc from Copenhagen Business School and a BCom from the University of Ottawa, and founded Gingernomics to teach individual investors the Five Criteria framework. More about Gingernomics.

The content on Gingernomics is for educational and informational purposes only and does not constitute financial advice. Always do your own research and consult a licensed financial advisor before making any investment decisions. Past performance is not indicative of future results.