What Is Free Cash Flow?

Free Cash Flow (FCF) = Operating Cash Flow − Capital Expenditures. It is the cash a company generates after all spending required to maintain or expand its productive asset base. FCF is considered by many analysts — including Warren Buffett — to be the single most important indicator of a company's true financial health and intrinsic value.

Our calculator is pre-filled with a typical mid-size company: $420,000 operating cash flow minus $95,000 in capital expenditures = $325,000 in free cash flow. The CapEx reinvestment rate of 22.6% means the company retains 77.4% of its operating cash flow as free cash — a healthy, asset-light profile.

Why FCF Beats Net Income

Net income is subject to accounting choices — depreciation schedules, revenue recognition timing, and non-cash charges. Companies can report profits while destroying cash. FCF strips away these distortions: if the cash isn't in the bank account, it doesn't count. Amazon famously prioritized FCF over reported earnings for years, investing aggressively while showing thin profits — correctly reflecting its cash-generating power to sophisticated investors who analyzed FCF.

FCF and Business Quality

Capital-light businesses (software, professional services, franchise models) convert most of their revenue to FCF with minimal reinvestment. Technology giants like Apple and Microsoft generate FCF margins of 20–30%. Capital-intensive industries (airlines, mining, semiconductors) may generate strong operating cash flow but spend most of it on maintenance capex, producing thin FCF margins. FCF margin = FCF ÷ Revenue. A FCF margin above 10% generally signals a high-quality, capital-efficient business worth a premium valuation multiple.

FCF in DCF Valuation

The most rigorous business valuation method — Discounted Cash Flow (DCF) — projects FCF over 5–10 years, applies a terminal value, and discounts everything back to present value at the company's WACC. Intrinsic Value = PV of FCF + PV of Terminal Value. Analysts at Goldman Sachs, Morgan Stanley, and every major bank use FCF-based DCF as their primary valuation tool. A company generating $325,000 in annual FCF growing at 8% per year, valued at 20× FCF, has an intrinsic value of approximately $6.5M.