Free Cash Flow: Formula, Example and What Good Looks Like

Free cash flow is the cash a business has left after paying its operating costs and funding the capital spending needed to keep running. It is what remains for debt paydown, dividends, buybacks, acquisitions, or simply sitting in the bank. The standard formula is operating cash flow minus capital expenditures.

It matters because profit and cash are different things, and only one of them pays a vendor. A company can post a strong net income and still be unable to make payroll, usually because that income is tied up in receivables or was spent on equipment that the income statement spreads across future years. Free cash flow closes that gap.

Free cash flow formula

There are two versions in common use. Both are legitimate, they answer slightly different questions, and mixing them up is the most common error in a board deck.

For internal reporting, the first one is almost always what you want. Both inputs come straight off the cash flow statement: operating cash flow is the subtotal at the bottom of the operating section, and capital expenditures appear in the investing section, usually labeled purchases of property and equipment.

How do you calculate free cash flow?

Take operating cash flow from the cash flow statement and subtract the cash actually spent on property, plant, and equipment during the period. Do not use the depreciation figure. Depreciation is an allocation of past spending; capex is the cash that left the building this period, and those two numbers rarely match.

A worked example. Assume a distribution business closes the year with the following:

Net income and operating cash flow happen to be equal here, which is a coincidence worth noticing rather than a rule: the depreciation add back was almost exactly offset by working capital consumption. The business earned $820,000 on paper, converted all of it to operating cash, then spent $430,000 on equipment, leaving $390,000 genuinely free.

Notice which line helped. The $95,000 increase in accounts payable added to cash, because it represents goods and services received but not yet paid for. That is not a trick, it is how supplier credit works, and it is why days payable outstanding sits alongside receivables and inventory in any serious cash conversation.

What is the difference between free cash flow and operating cash flow?

Operating cash flow measures cash generated by running the business. Free cash flow subtracts the capital spending required to keep that business running, so it reflects what is genuinely available to distribute or reinvest elsewhere. A company with strong operating cash flow and heavy capex can have very little free cash flow.

That difference is exactly why capital intensive businesses get valued differently from software ones. Two companies can report identical operating cash flow, but if one has to spend most of it replacing trucks and the other spends almost nothing, they are not remotely comparable. Free cash flow is the number that exposes it.

Is free cash flow the same as net income?

No, and the gap between them is one of the more useful diagnostics in finance. Net income is an accrual measure: it books revenue when earned and expenses when incurred, regardless of when cash moves. Free cash flow tracks the cash itself and charges the full capex in the period it is paid.

When net income consistently runs well above free cash flow year after year, something is absorbing the difference. Usually it is receivables growing faster than sales, inventory building up, or capex that never slows down. None of those are automatically bad, but each deserves an explanation.

Can free cash flow be negative?

Yes, and negative free cash flow is not automatically a warning sign. A profitable company that just built a second warehouse will report negative free cash flow for that year, and that is a deliberate investment rather than distress. Growth stage companies routinely run negative while they build capacity.

The question to ask is what caused it. Negative free cash flow from a large, identifiable, one time investment is a choice. Negative free cash flow because operating cash flow itself is negative, or because working capital keeps expanding without revenue following, is a problem. The pattern over several periods tells you which one you are looking at far better than any single year.

What is a good free cash flow?

There is no universal threshold, so the useful measures are relative. Free cash flow margin, which is free cash flow divided by revenue, lets you compare against your own history and against peers of a similar shape. Free cash flow conversion, free cash flow divided by net income, shows how much of reported profit is actually turning into cash.

A single quarter tells you very little. Capex is lumpy, big customers pay late, and a single equipment purchase can swing the number. Look at four to eight quarters and judge the direction.

Three levers that move free cash flow

Once you are measuring it, the improvements are mostly unglamorous and they compound.

Collect faster. Every day shaved off days sales outstanding converts directly into cash without selling anything more. Invoice the day the work completes rather than at month end, and chase past due accounts on a schedule rather than when someone remembers.

Pay on terms, not early and not late. Paying suppliers before the due date hands over cash you were entitled to hold. Paying late costs relationships and sometimes fees. The exception worth taking is a genuine early payment discount, where 2/10 net 30 is an annualized return most businesses cannot beat elsewhere, but capturing those requires approval cycles measured in days rather than weeks. This is where slow invoice handling quietly costs real money, and where working out the AP automation ROI for your own volume is worth an afternoon.

Stop spending capital you do not need. Review capex requests against actual utilization rather than against last year's budget. Equipment bought because the budget existed is the most common permanent drag on free cash flow, and it never shows up as an obvious mistake because the depreciation is spread thinly across future years.

Accuracy underneath all three matters more than most teams expect. If capex is scattered across supplier contracts, purchase orders, and invoices that nobody has captured into a system, the capital spending number in your cash flow statement is an estimate. Getting those figures out of the source documents reliably, whether through structured extraction of the underlying paperwork or a disciplined coding process, is what makes the whole calculation trustworthy.

Free cash flow and the AP function

Accounts payable sits directly on this number. Payment timing decides when cash actually leaves, discount capture decides whether you are paid to pay early, and duplicate or erroneous payments are pure free cash flow leakage that shows up nowhere in the plan.

The practical version: know what you owe and when it is due, in one place, before the week starts. Teams running approvals over email typically cannot answer that question accurately, which means payment timing becomes reactive and early payment discounts get missed by default rather than by decision. Reliable accounts payable software is less about processing speed than about making the cash outflow side of free cash flow a deliberate choice.

Pair this with working capital management and the cash conversion cycle for the full picture. Free cash flow is the outcome; those two explain the mechanics that produce it.