Free Cash Flow: What It Is and How to Calculate It

By Peter · 24 Sept 2026

Every metric covered so far on this site (EPS, ROE, BVPS) starts from net income, an accounting figure shaped by choices like depreciation schedules, revenue recognition timing, and non-cash charges. Free cash flow starts somewhere different: actual cash moving in and out of the business. It's the closest thing on a financial statement to "how much money did this company really generate that it could hand to shareholders, pay down debt with, or reinvest, after keeping the lights on."

The Free Cash Flow Formula

Free Cash Flow = Operating Cash Flow − Capital Expenditures

Operating cash flow comes from the cash flow statement. It's net income adjusted for non-cash items (like depreciation) and changes in working capital, so it reflects actual cash generated by the core business.
Capital expenditures (CapEx) is the cash spent on property, plant, and equipment. It's the money the business has to keep spending just to maintain or grow its operations.

Subtracting CapEx matters because operating cash flow alone can overstate how much cash a company is truly free to use. A business earning strong operating cash flow but pouring nearly all of it back into new equipment isn't generating much free cash, even if the top-line cash number looks healthy.

Worked Example

Say a company reports:

Operating cash flow: €25 million
Capital expenditures: €7 million

Free Cash Flow = €25M − €7M = €18 million

That €18 million is what's left over for dividends, buybacks, debt repayment, or reinvestment beyond maintaining the current business.

Why Free Cash Flow Is Harder to Manipulate Than Net Income

Net income involves accounting judgment calls: how fast to depreciate an asset, when to recognize revenue, how to value inventory. Two companies with identical cash businesses can report meaningfully different net income based on these choices.

Cash is harder to dress up. Money either moved through the bank account or it didn't. This doesn't make FCF immune to manipulation; a company can still time payments to suppliers, delay necessary CapEx to flatter this quarter's number, or pull working capital levers, but it's generally considered a more honest signal of underlying business health than net income alone, which is why it shows up so often in value-investing analysis specifically.

What Counts as Good Free Cash Flow?

There's no fixed euro amount that applies across companies. What matters more is:

Is FCF consistently positive? A company burning cash every year, even while reporting positive net income, is a signal worth investigating. The two numbers diverging is often more informative than either one alone.
FCF margin (FCF ÷ Revenue) lets you compare across company sizes. A software company might run FCF margins above 20-30%, while a capital-intensive industrial business might run in the single digits. Again, industry context matters, the same way it does for ROE and debt-to-equity.
Is it growing in line with the business, or lagging behind reported earnings? A widening gap between net income and free cash flow, especially if it persists for several years, is one of the more useful early-warning signs in fundamental analysis.

Where This Can Mislead You

CapEx timing is lumpy. A company might have one unusually large or unusually small CapEx year (a new factory, a delayed equipment refresh) that makes a single year's FCF look better or worse than the underlying business really is. Look at a multi-year average rather than one year in isolation.

Maintenance CapEx vs. growth CapEx aren't separated in the basic formula. The formula subtracts all CapEx, but some of that spending is required just to maintain existing operations (maintenance CapEx) while some is discretionary spending to expand (growth CapEx). A company investing heavily in growth CapEx might show weaker "free" cash flow while actually building long-term value, but the basic formula alone won't tell you which kind of spending you're looking at.

Working capital swings can flatter or distort a single period. Delaying payments to suppliers or accelerating collections from customers can temporarily boost operating cash flow (and therefore FCF) without reflecting a real improvement in the business. This is one of the more common short-term levers companies pull right before reporting periods.

It doesn't account for debt obligations directly. A company can show strong free cash flow and still be under financial strain if a large share of that cash is legally committed to interest payments or debt maturities. Read FCF alongside the debt-to-equity ratio rather than in isolation.