Free cash flow is the cash left over once a company has paid for everything it needs to keep running and growing — its day-to-day operating costs and its investment in property, plant and equipment. It is the cash that is genuinely free to return to investors or reinvest at management’s discretion.
Because it is drawn from the cash flow statement rather than accrual earnings, FCF is harder to massage than reported profit — it is the money that actually moved.
Divide FCF by market cap and you get free cash flow yield, a cash-based cousin of the earnings yield.
Suppose a company reports $1,500M of operating cash flow and spends $400M on capital expenditures during the year:
That $1,100M is what the business could hand to shareholders, use to repay debt, or reinvest, without touching its existing operations. Against a $22,000M market cap, that is a 5% free cash flow yield.
Use FCF to check the quality of reported earnings: when net income runs well ahead of free cash flow year after year, it is worth asking why. FCF is also the raw material of a discounted-cash-flow valuation — the stream of cash being discounted back to today.
Free cash flow matters most for mature, cash-generative businesses and for any intrinsic valuation. It is the clearest read on whether a company funds its dividends and buybacks from real cash rather than from borrowing.
Capital spending is lumpy, so a single year of FCF can be noisy — a big factory build can depress it for good reasons. Heavy, value-creating investment can make a growing company look cash-poor. Definitions also vary: levered FCF is after interest, unlevered before it, so always check which one a figure refers to.