Quick answer
Free Cash Flow = Operating Cash Flow − Capital Expenditures. Example: OCF $12M − CapEx $3M = FCF $9M. FCF represents the cash left after maintaining and growing the business - available for dividends, buybacks, debt repayment, or acquisitions.
How to use this free cash flow calculator
Enter Operating Cash Flow (OCF) from the cash flow statement (cash from operations section) and Capital Expenditures (also from the cash flow statement, listed as "purchase of property, plant & equipment" or similar). The calculator shows FCF immediately. Optionally enter Market Capitalisation to see FCF Yield - a valuation metric comparable to earnings yield.
Use consistent units. All figures should be from the same period - typically the last twelve months (LTM) for a valuation context, or a single fiscal year for reporting.
Free cash flow explained to a beginner
Think of running a food truck. Each month you collect $10,000 in cash from customers after paying for ingredients, fuel, and your assistant. That is your operating cash flow - cash from the core business before any investment spending.
But to keep operating, you eventually need to repair and replace the truck. This month you spend $2,000 replacing the engine - that is CapEx. FCF = $10,000 - $2,000 = $8,000. That $8,000 is truly free: you could pocket it, invest in a second truck, or pay down the loan on the first one.
If you ignored the $2,000 engine cost and only looked at the $10,000, you would think you were wealthier than you are. FCF prevents that mistake - it tells you how much cash the business actually produces after keeping itself in working order.
A business that earns $30M in operating cash flow but spends $22M on machinery each year only truly generates $8M.
Free Cash Flow formula
The standard FCF formula uses cash flow statement line items directly:
$$\text{FCF} = \text{Operating Cash Flow} - \text{Capital Expenditures}$$
An alternative derivation starts from the income statement and adjusts for non-cash items and working capital:
$$\text{FCF} = \text{Net Income} + \text{D\&A} - \Delta\text{Working Capital} - \text{CapEx}$$
Both formulas yield the same result if the inputs are consistent. The operating cash flow method is simpler and less prone to manipulation. The income statement method is useful when the cash flow statement is unavailable or when building a financial model.
Two related metrics:
$$\text{FCF Yield} = \frac{\text{FCF}}{\text{Market Cap}} \times 100$$
$$\text{FCF Margin} = \frac{\text{FCF}}{\text{Revenue}} \times 100$$
FCF vs. EBITDA vs. net income
Each profitability metric answers a different question about the business:
| Metric | What it measures | Includes CapEx | Includes D&A | Includes Working Capital |
|---|---|---|---|---|
| Net Income | Accounting profit (GAAP) | No | Yes (as expense) | No |
| EBITDA | Operating profit before D&A | No | Added back | No |
| Operating Cash Flow | Cash from core operations | No | Added back | Yes |
| Free Cash Flow | Cash after capital investment | Yes (subtracted) | Added back | Yes |
Warren Buffett has consistently argued that FCF is the most honest measure of business earnings because it accounts for the capital investment required to sustain the business. EBITDA can be manipulated by changing D&A accounting; FCF is harder to engineer because it tracks actual cash movement.
Worked examples for free cash flow
| Company Type | OCF | CapEx | FCF | FCF Margin (vs. Revenue) |
|---|---|---|---|---|
| SaaS company ($50M revenue) | $12M | $1M | $11M | 22% |
| Manufacturer ($200M revenue) | $30M | $22M | $8M | 4% |
| Telecom ($1B revenue) | $250M | $180M | $70M | 7% |
| High-growth startup ($30M revenue) | -$5M | $3M | -$8M | Negative |
| Retail chain ($500M revenue) | $40M | $25M | $15M | 3% |
Looking at the worked examples table above, I notice the SaaS versus manufacturer comparison makes the clearest case for why capital intensity matters.
The SaaS company converts 22% of its $50M revenue into free cash flow - nearly one in four revenue dollars is genuinely free.
The manufacturer converts only 4% on four times as much revenue. Its $30M operating cash flow looks substantial until you see that $22M immediately exits for machinery. For every dollar of additional revenue the manufacturer wants to grow, a significant portion must be reinvested in plant capacity.
For the SaaS company, incremental revenue adds almost directly to FCF because the cost of serving another customer is close to zero.
FCF yield and benchmarks
FCF Yield = FCF / Market Cap × 100. It is the inverse of the Price-to-FCF multiple and measures how much free cash flow investors receive per dollar of market value - analogous to earnings yield for P/E ratios.
| FCF Yield | Interpretation | Price-to-FCF multiple |
|---|---|---|
| < 2% | Very expensive - typical of high-growth stocks | > 50x |
| 2% – 4% | Premium valuation | 25x – 50x |
| 4% – 6% | Fair value range for quality businesses | 17x – 25x |
| 6% – 10% | Attractively priced | 10x – 17x |
| > 10% | Deep value or distress signal | < 10x |
Negative free cash flow: what negative FCF means
Negative FCF means CapEx exceeds operating cash flow. Context determines whether this is a warning sign or a healthy investment phase:
- Healthy negative FCF: A company in a defined expansion phase - building a factory, rolling out infrastructure, entering a new market - intentionally investing above its current operating cash flow to drive future returns. Amazon ran negative FCF for years while building its fulfilment network and AWS.
- Concerning negative FCF: A mature company consistently spending more on maintenance CapEx than it generates from operations, requiring repeated equity raises or debt financing to fund the gap. This destroys shareholder value over time.
- Structural negative FCF: Some capital-intensive industries (airlines, oil & gas, telecom) routinely run near-zero or negative FCF due to the continuous investment demands of their asset base. Evaluate relative to the industry, not in absolute terms.
One pattern I see repeatedly when evaluating negative FCF: people lump investment-phase negative FCF together with structural negative FCF and extend the same tolerance to both.
The key question is whether the company can point to a defined end-state for the elevated spending - a specific asset being built, a capacity expansion with a known completion date, a market entry with a quantified payback period.
Amazon's negative FCF years came with a concrete answer: AWS and fulfilment centres with identifiable return profiles. A telecom running negative FCF every year with no improving trend is different - that is a business where the cost of staying competitive perpetually exceeds what it generates.
Before extending patience to a negative FCF company, ask whether there is a credible path to when the spending stops and the cash generation starts.
Frequently asked questions about FCF
What is Free Cash Flow?
FCF is the cash generated by a business from its operations after paying for capital expenditures. It represents cash available for dividends, share buybacks, debt repayment, or acquisitions. FCF = Operating Cash Flow − CapEx.
Where do I find operating cash flow and CapEx?
Both are on the cash flow statement. Operating Cash Flow is the subtotal of the "Cash from Operating Activities" section. CapEx appears in the "Cash from Investing Activities" section - often labelled "purchase of property, plant and equipment" or "capital expenditures." CapEx is typically a negative number on the cash flow statement; enter the absolute value.
What is the difference between FCF and EBITDA?
EBITDA adds back D&A to operating profit - it does not deduct CapEx. FCF starts from operating cash flow (which includes working capital movements) and subtracts CapEx. For a capital-intensive manufacturer spending $50M on CapEx, EBITDA might be $80M while FCF is only $30M. EBITDA overstates cash generation for heavy CapEx businesses; FCF does not.
What is FCF yield and what is a good level?
FCF Yield = FCF / Market Cap × 100. It shows how much free cash flow an investor receives per dollar invested. A yield above 5% is generally considered attractive for a quality business. Compare against 10-year Treasury yields as the risk-free benchmark - FCF yield should exceed risk-free rates by a sufficient margin to compensate for equity risk.
Can FCF differ significantly from net income?
Yes - sometimes dramatically. A profitable company with poor working capital management (rising receivables, slow collections) can have low or negative FCF despite high net income. Conversely, a loss-making startup can have positive FCF if it collects cash upfront (subscriptions) and defers costs. Always check FCF alongside net income for a complete picture.
Quiz: how well do you know free cash flow?
1. What does Free Cash Flow (FCF) represent?
2. A SaaS company has $50M revenue, OCF of $12M, and CapEx of $1M. What is its FCF and FCF Margin?
3. Why does Warren Buffett argue that FCF is a more honest measure of business earnings than EBITDA?
4. According to the FCF yield benchmarks table, what yield range indicates a business is trading at fair value?
5. What distinguishes concerning negative FCF from healthy negative FCF?