What free cash flow measures
Free cash flow measures the cash a business generates after funding the capital expenditures needed to maintain or grow its operations. It is useful because accounting earnings include non-cash items, while operating cash flow still precedes spending on property, equipment and other long-lived operating assets.
There is no single label used consistently in every model. A company data page often uses cash from operations minus capital expenditures. A DCF model may instead use unlevered free cash flow to the firm, while an equity model may use free cash flow to equity. Always match the formula to the claim being made.
When CapEx is reported as a negative cash-flow-statement number, analysts normally use its absolute cash outflow in the subtraction. Subtracting an already negative number would incorrectly add CapEx back.
How to calculate free cash flow
Use the cash flow statement when it is available; it requires the fewest assumptions.
- 1
Find net cash provided by operating activities for the period you are analyzing.
- 2
Identify purchases of property, plant and equipment and any other operating CapEx included in your chosen definition.
- 3
Normalize the sign so CapEx is treated as a positive cash outflow in the formula.
- 4
Subtract CapEx from operating cash flow, then compare the result with prior periods and revenue rather than judging one isolated number.
Free cash flow calculation example
Assume a company reports the following annual cash flows, in USD millions.
| Starting point | Formula or value | When to use it |
|---|---|---|
| Cash from operations | $1,250 | Reported in operating activities |
| Capital expenditures | $200 | Entered as a positive cash outflow |
| Free cash flow | $1,050 | Cash remaining after CapEx |
$1,250 − $200 = $1,050 million of free cash flow.
The company converted $1.25 billion of operating cash flow into $1.05 billion of free cash flow after reinvestment. That does not automatically make the stock attractive: the result still needs context from revenue, cyclicality, financing needs, valuation and the sustainability of working-capital movements.
Free cash flow formulas from EBITDA, EBIT and net income
These formulas reconcile earnings to cash. They should produce comparable economics only when the inputs use consistent definitions and periods.
| Starting point | Formula or value | When to use it |
|---|---|---|
| Cash from operations | CFO − CapEx | Best shortcut when a cash flow statement is available |
| EBIT | EBIT × (1 − T) + D&A − ΔNWC − CapEx | Produces unlevered FCF / FCFF before financing flows |
| EBITDA | EBITDA × (1 − T) + D&A × T − ΔNWC − CapEx | Equivalent to the EBIT approach when D&A is the EBIT-to-EBITDA difference |
| Net income | Net income + non-cash charges − ΔNWC − CapEx | A levered starting point because net income is after interest |
FCF vs. FCFF vs. FCFE
The right cash flow and discount rate must represent the same group of capital providers.
| Metric | Core formula | Cash belongs to | DCF discount rate |
|---|---|---|---|
| Simple FCF | CFO − CapEx | Depends on the stated convention | Do not assume without checking |
| FCFF / UFCF | NOPAT + D&A − ΔNWC − CapEx | Debt and equity providers | WACC |
| FCFE / LFCF | Net income + D&A − ΔNWC − CapEx + net borrowing | Common equity holders | Cost of equity |
Common free cash flow mistakes
- Subtracting a negative CapEx line and accidentally adding the cash outflow back.
- Mixing quarterly operating cash flow with annual or trailing-twelve-month CapEx.
- Calling every cash flow FCFF even when the starting point already includes interest expense.
- Treating a working-capital release or unusually low CapEx as permanent cash generation.
Free cash flow formula FAQ
What is the simplest free cash flow formula?
The common company-analysis formula is cash from operations minus capital expenditures. State exactly which CapEx items are included so the result can be reproduced.
How do you calculate free cash flow from EBITDA?
A common unlevered derivation is EBITDA × (1 − tax rate) + D&A × tax rate − increase in net working capital − CapEx. Additional non-cash or non-recurring items may require adjustments.
Can free cash flow be negative?
Yes. Negative FCF can reflect weak operations, heavy investment, working-capital consumption or a combination of them. The cause and expected duration matter more than the sign alone.
The practical takeaway
Use CFO minus CapEx for a transparent reported-data view. Use FCFF or FCFE when the valuation requires a cash flow tied to specific capital providers, and keep the discount rate consistent with that choice.