Free Cash Flow: Formula, FCFF vs FCFE, and Valuation

Free cash flow (FCF) is the cash a business generates from its operations after subtracting the capital it must reinvest just to keep running, calculated as Operating Cash Flow minus Capital Expenditure (FCF = OCF – Capex). It is the cash actually available to lenders and shareholders once the machinery gets replaced, the servers get renewed, and the leased office gets fitted out again. Investors, acquirers, and every discounted cash flow model price a business on this number, not on accounting profit, because it is far harder to flatter with a depreciation schedule or a revenue-recognition choice.

Free cash flow sits downstream of the discipline covered in our guide to cash flow management. Get the operating cash flow line right first, collections tracked, payables timed, working capital understood, and the number stops being a spreadsheet guess and becomes something a buyer can underwrite.

The Free Cash Flow Formula

The formula analysts use most often starts from the cash flow statement, not the P&L:

Free Cash Flow = Operating Cash Flow – Capital Expenditure

Operating cash flow itself is net income adjusted for non-cash items, depreciation and amortisation added back, and the change in working capital, receivables, payables, and inventory, subtracted or added depending on direction. Capital expenditure is the cash actually spent on property, plant, equipment, and capitalised software during the period, taken straight from the investing section of the cash flow statement. Two businesses with identical reported profit can produce very different FCF if one runs a receivables book that keeps stretching and the other collects on time, or if one is quietly capital-light and the other keeps buying machines to stand still. The Corporate Finance Institute’s breakdown of free cash flow walks through the same build from first principles if you want the full mechanics.

One distinction worth making explicit: not all capex is equal. Maintenance capex, the spend required just to keep existing assets running at current capacity, is unavoidable and belongs in every FCF calculation without argument. Growth capex, a new factory line, a second office, capitalised spend on a new product, is discretionary in timing even if it is strategically necessary. Some analysts separate the two and calculate an adjusted figure that only deducts maintenance capex, to see what the business could distribute if it simply chose to stop expanding. In our experience this distinction matters most for founders trying to explain to a board why FCF looks tight in a growth year: it is not a red flag on its own if the extra spend is genuinely growth capex, but a buyer will still want it itemised and justified line by line.

FCFF and FCFE: The Two Variants a Valuation Actually Uses

The basic FCF formula is a useful diagnostic, but valuation work almost always splits it into two more precise variants, because “cash left over” means something different to a lender than it does to a shareholder.

• FCFF (Free Cash Flow to the Firm), also called unlevered free cash flow, is the cash available to every capital provider, both debt and equity, before interest is paid. FCFF = EBIT × (1 – tax rate) + Depreciation & Amortisation – Capex – Change in Net Working Capital. Because it excludes financing decisions entirely, FCFF is discounted at the weighted average cost of capital (WACC) to reach enterprise value.
• FCFE (Free Cash Flow to Equity), or levered free cash flow, is what is left for shareholders specifically, after debt holders have been paid their interest and principal. FCFE = FCFF – Interest Expense × (1 – tax rate) + Net Borrowing (new debt raised minus debt repaid). FCFE is discounted at the cost of equity to reach equity value directly.

The choice between the two is not stylistic. An analyst valuing the whole enterprise, ahead of deciding how it is financed, works in FCFF and arrives at enterprise value first. Getting from that number to what a shareholder actually receives is exactly the walk we cover in our guide to enterprise value vs equity value. An analyst valuing a highly leveraged business, where the debt structure materially changes shareholder cash flow, often works in FCFE directly. Aswath Damodaran’s valuation research at NYU Stern is the standard academic reference most practitioners still build their FCFF and FCFE models from.

A Worked Example: FCF in Rupees and Dollars

Take an Indian services company reporting ₹18 crore of operating cash flow for the year, after adding back ₹2.5 crore of depreciation and adjusting for a ₹1.2 crore build-up in receivables. Capital expenditure for the year, new laptops, a leased-office fit-out, and capitalised product development, comes to ₹4 crore.

FCF = ₹18 crore – ₹4 crore = ₹14 crore. That is the cash actually available to pay down debt, distribute to shareholders, or fund the next year’s growth without raising outside capital.

Run the same arithmetic for a US-based SaaS company: $6.2 million of operating cash flow and $0.9 million of capex for the year, mostly capitalised software development and a small equipment refresh.

FCF = $6.2 million – $0.9 million = $5.3 million. Note that neither example needed the income statement at all. That is deliberate. FCF is built entirely from cash actually collected and cash actually spent, which is exactly why it resists the accounting choices that can move reported profit.

Now split the Indian example into FCFF and FCFE to see why the distinction matters in practice. Suppose the ₹18 crore of operating cash flow already reflects ₹1.5 crore of after-tax interest paid on term debt, and the company raised ₹2 crore of fresh borrowing during the year while repaying ₹1 crore of principal. Add the interest back and strip out the net borrowing to reach FCFF (unlevered, before financing decisions), then work the other direction to reach FCFE (levered, after financing decisions) starting from the ₹14 crore FCF figure. The FCFF number is what an acquirer values the whole enterprise on, debt-free and cash-free. The FCFE number is closer to what an existing shareholder could actually expect to see distributed, after the company’s own lenders have been serviced. The two numbers rarely match, and conflating them is one of the more common valuation errors we see founders make when they build their own DCF ahead of a raise.

Free Cash Flow vs Net Profit: Why the Two Numbers Diverge

Net profit and free cash flow answer different questions, and in our experience this is the single most common confusion founders bring into a valuation conversation. Net profit measures performance under accrual accounting: revenue is recognised when earned, expenses when incurred, regardless of when cash actually moves. FCF measures liquidity: cash actually collected minus cash actually spent, including the capital reinvestment the P&L never shows in full.

Three gaps explain most of the divergence. First, non-cash charges, depreciation, amortisation, stock-based compensation, reduce net profit without touching cash, so FCF adds them back. Second, working capital timing: a company can report strong profit while cash is trapped in unpaid invoices or an inventory build-up, exactly the mechanics covered in our guide to the cash conversion cycle. Third, capital expenditure never fully hits the P&L in the year it is spent, depreciation spreads it out, but it hits cash flow immediately and in full.

A company can be profitable and still run out of cash. It cannot run out of FCF without the business itself being in trouble, which is precisely why a buyer’s quality of earnings review always reconciles reported EBITDA back to actual cash generated, not the other way round. If the two numbers cannot be reconciled cleanly, that gap is usually the first real question in the room.

FCF Margin: A Quality Signal, Not Just a Number

Free cash flow margin, FCF divided by revenue, converts an absolute rupee or dollar figure into a comparable percentage, and it is one of the fastest ways an investor sizes up how efficiently a business actually converts growth into cash. A company growing revenue 40% a year while burning cash is telling a very different story than one growing 20% at a healthy FCF margin.

Rough benchmarks vary sharply by sector. Asset-light software and services businesses that have reached scale often run FCF margins of 20-30%+; capital-intensive manufacturing or infrastructure businesses can be healthy at high single digits because the capex line is structurally larger. What matters more than hitting a specific number is the trend: an FCF margin that is expanding as the company scales signals genuine operating leverage. One that is compressing while revenue grows usually means the growth is being bought, through discounting, extended credit terms, or working capital that keeps stretching to fund the next sale. Investopedia’s explainer on free cash flow covers the margin calculation alongside the standard FCF build if you want a second reference point.

Why DCF Valuations Discount Free Cash Flow, Not Profit

Every discounted cash flow model is, at its core, a projection of future free cash flow discounted back to today’s value, not a projection of future accounting profit. The logic is straightforward once you see it: an investor’s return is paid in cash, dividends, debt paydown, buybacks, capital appreciation funded by real cash generation, never in accounting entries. A business can report a healthy profit for years while consistently failing to generate the cash to pay anyone, and no amount of reported earnings changes what an owner can actually take out of it.

This is also why the choice of FCFF versus FCFE matters mechanically inside the model, not just conceptually. Project FCFF and discount at WACC, and you land on enterprise value, the value of the whole business before debt is netted out. Project FCFE and discount at the cost of equity, and you land on equity value directly. Our full walkthrough of the mechanics, terminal value, discount rate selection, and sensitivity, lives in our guide to discounted cash flow valuation. Get the FCF inputs wrong, and no amount of precision in the discount rate rescues the output.

What a Weak FCF Story Signals to a Buyer

When free cash flow lags reported profit for more than a quarter or two, a buyer or investor treats it as a flag, not a footnote. The first place they look is working capital discipline, whether receivables are genuinely being collected on terms or simply growing alongside revenue, which is exactly the ground our guide to working capital management covers. The second is capital intensity, whether the business needs an ever-larger slice of its own cash generation just to stand still, a question that shows up directly in every valuation exercise, including the frameworks in our guide to how startups are valued.

The arithmetic is unforgiving because a DCF is only as good as the cash flow it discounts. A founder who can walk into a raise or a sale process with three years of free cash flow that reconciles cleanly to reported earnings has already answered the question most buyers spend the first month of diligence asking.

Preparing for a valuation, a raise, or a sale and want your free cash flow story to hold up under a buyer’s model, not just your own? KayOne Consulting builds the FCF, FCFF, and FCFE analysis behind the valuation, and gets the underlying numbers diligence-ready before anyone else tests them. See if we’re a fit