Operating Cash Flow (OCF) measures the actual cash your business generates from
its core operations. Unlike net income, OCF is hard to manipulate with accounting
choices — cash either arrived in your bank account or it didn't.
The indirect method formula
OCF = Net Income + Depreciation & Amortization + Working Capital Changes
This is the most common method (indirect method) because it starts from the readily
available net income figure and adjusts for non-cash items and timing differences.
Why OCF differs from net income
Depreciation reduces reported profit but doesn't use cash. A $10k server depreciated
over 5 years reduces net income by $2k/year but was paid for in year 1. Adding back D&A
converts income-statement profit into cash-based profit.
Working capital changes reflect the timing difference between revenue recognition
and cash collection:
- Accounts receivable increased → you invoiced customers but haven't collected yet → OCF is lower than net income
- Accounts payable increased → you received goods but haven't paid yet → OCF is higher than net income
Free Cash Flow (FCF)
FCF = OCF − Capital Expenditures
Free cash flow is what's left after maintaining and growing the asset base. It's the
metric private equity firms and sophisticated investors use to value businesses because
it represents actual distributable cash.
OCF
Capex
FCF
Interpretation
+$100k
$5k
+$95k
Healthy — business is a cash generator
+$100k
$50k
+$50k
Acceptable — investing heavily in assets
+$100k
$120k
−$20k
Growth investment phase
−$50k
$10k
−$60k
Cash drain — requires external funding
Cash conversion ratio
Cash Conversion Ratio = OCF ÷ Net Income
CCR above 1× means the business generates more cash than reported profit (good).
CCR below 1× means profit is outpacing cash collection — watch accounts receivable.
CCR above 1.5× often indicates large non-cash depreciation charges relative to capex.
Frequently asked questions
What does this calculator do?
Calculate Operating Cash Flow from net income, D&A, and working capital changes — plus Free Cash Flow and Cash Conversion Ratio.
Operating Cash Flow vs Net Income: What's the Difference?
Why OCF and net income differ, what each measures, and how to use them together to understand a business's real profitability.
Operating Cash Flow and net income both claim to measure business profitability —
but they tell very different stories. Understanding both is essential for interpreting
financial statements accurately.
What net income measures
Net income (also called profit or earnings) is revenue minus all costs, as recorded
on the income statement. It follows accrual accounting: revenue is recognized when
earned, and expenses are matched to the period they relate to.
This means a business can have high net income while receiving no cash. A company
that sells $1M on credit but collects nothing will show $1M net income and $0 cash.
What OCF measures
Operating Cash Flow adjusts net income for:
Non-cash charges (depreciation, amortization, stock compensation): added back
because they reduce net income but don't use cash
Working capital changes: accounts receivable, inventory, and payables timing
differences between revenue recognition and cash collection/payment
OCF = Net Income + Non-cash Charges + Working Capital Changes
Why they diverge
Case 1: Company A — fast growth, large receivables
Net income: $500k. Customers owe $600k (not yet collected). OCF: negative.
Interpretation: the business is profitable but burning cash to fund growth.
Case 2: Company B — mature, asset-heavy business
Net income: $200k. Depreciation on equipment: $300k. OCF: $500k.
Interpretation: true cash generation is much higher than the P&L shows.
The reliability of OCF
Sophisticated investors prefer OCF and free cash flow over net income because:
- Revenue recognition can be manipulated (pull forward, defer)
- Depreciation schedules are management choices
- OCF requires actual cash to arrive in the bank
A business with consistently high net income but low OCF deserves scrutiny.
Free Cash Flow: Formula, Examples, and Why It Matters
What is Free Cash Flow (FCF), how to calculate it from OCF and CapEx, and why it's the most important metric for business valuation.
Free Cash Flow (FCF) is the cash remaining after a business covers its operating
expenses and capital expenditures. It's what's available for growth investment,
debt repayment, dividends, or building cash reserves.
Free Cash Flow = Operating Cash Flow − Capital Expenditures
Why FCF is the gold standard for valuation
Most serious business valuation models use Discounted Free Cash Flow (DCF). Acquirers
and PE firms value businesses at a multiple of FCF rather than revenue or EBITDA
because FCF represents real, distributable money.
A business valued at 15× FCF generating $500k/year FCF has a $7.5M enterprise value.
FCF yield — the investor's shortcut
FCF Yield = FCF / Enterprise Value
A 5% FCF yield means you'd earn 5% of the purchase price annually in free cash.
That's roughly equivalent to a 20× FCF multiple. Most buyers target 5–10% FCF yield
as a minimum return requirement.
What CapEx to include
CapEx includes:
- Equipment purchases
- Office buildout and leasehold improvements
- Capitalized software development (for B2B SaaS, this can be significant)
- Vehicle fleet and machinery
CapEx does NOT include:
- Maintenance repairs (expensed, not capitalized)
- Software subscription costs (operating expense)
- R&D salaries (operating expense)
FCF margin as a growth benchmark
FCF Margin = FCF / Revenue
For SaaS companies, FCF margin matters as much as revenue growth. The combined metric
(growth rate + FCF margin) is increasingly used as a Rule of 40 variant.
How changes in accounts receivable, inventory, and payables affect operating cash flow — and how to manage working capital to improve cash generation.
Working capital is the difference between current assets (cash, receivables, inventory)
and current liabilities (payables, accrued expenses). Changes in working capital are
often the hidden driver of the gap between net income and operating cash flow.
The working capital formula
Working Capital = Current Assets − Current Liabilities
Working Capital Change Impact on OCF:
- Receivables increase → cash hasn't been collected → OCF decreases
- Inventory increase → cash paid but not yet sold → OCF decreases
- Payables increase → you owe money but haven't paid → OCF increases
Common cash flow drains from working capital
Slow collection: A $1M ARR SaaS company invoicing on net-60 terms has ~$165k
permanently tied up in receivables (two months of revenue). Switching to net-15 frees
$125k in immediate cash without changing revenue.
Inventory build: E-commerce companies building inventory before peak season
consume cash months before receiving revenue. Careful inventory planning reduces
the working capital trap.
Advance payments: Charging annual plans upfront (subscription in advance)
creates negative working capital — you receive cash before recognizing revenue.
This is one reason SaaS companies love annual prepayments.
How to improve working capital
Offer early payment discounts: 1–2% discount for payment within 10 days
(net-30) is often economically rational for buyers and dramatically improves your
receivable collection.
Switch to annual billing: moving customers from monthly to annual billing
collects 12 months of cash upfront vs 1 month at a time.
Negotiate supplier terms: extending payables from net-30 to net-60 provides
interest-free short-term financing at your suppliers' cost.
Just-in-time inventory: for physical products, reduce inventory carrying costs
by ordering closer to actual demand.
Tools our audience uses alongside this calculator.
PuzzleStartup accounting
Modern accounting software built for startups. Automated bookkeeping, real-time P&L, and cash flow statements — without needing a full-time accountant.