Last reviewed: July 2026.
Cash-flow ratios compare cash generated by a business with liabilities, revenue, profit, investment or financing commitments. They complement accrual-based ratios because a company may report profit while collecting cash slowly or building inventory.
There is no single universal definition for every cash-flow ratio. Analysts must state the formula used, use comparable periods and read the ratios with the full financial statements.
Main cash-flow ratios
| Measure | Formula | What it suggests |
|---|---|---|
| Operating cash flow ratio | Operating cash flow ÷ current liabilities | Short-term obligations covered by operating cash generation. |
| Cash flow margin | Operating cash flow ÷ revenue × 100 | Cash generated from each unit of revenue. |
| Cash conversion of profit | Operating cash flow ÷ operating profit | Extent to which accrual profit converts into cash. |
| Capital expenditure coverage | Operating cash flow ÷ cash capital expenditure | Ability to fund investment internally. |
| Debt service coverage (simplified) | Operating cash flow ÷ cash interest and principal commitments | Capacity to service debt; exact definitions vary. |
| Free cash flow | Operating cash flow − cash capital expenditure | Cash remaining after maintaining or expanding long-term assets. |
Operating cash flow ratio
The operating cash flow ratio is commonly calculated as:
Operating cash flow ÷ average or closing current liabilities
A result of 0.80 means operating cash flow for the period equals 80% of the liability denominator. The ratio is not identical to the current ratio: one uses a period cash flow, while the other compares point-in-time assets and liabilities.
Use average current liabilities when seasonality or major year-end movements make the closing figure unrepresentative. Always disclose which denominator was used.
Cash flow margin
Cash flow margin compares operating cash flow with revenue. A rising margin can indicate improved collections, working-capital discipline or stronger underlying profitability. A declining margin may result from slower customer payments, inventory growth, early supplier payment or lower operating performance.
Compare the margin with the profit margin. A persistent gap requires investigation, although temporary differences can be normal in a growing or seasonal business.
Cash conversion of profit
Cash conversion is often calculated as operating cash flow divided by operating profit, EBITDA or another defined profit measure. The chosen numerator and denominator must be consistent. A ratio above 1 can arise when working capital releases cash; a ratio below 1 can arise when receivables or inventory absorb cash.
Working-capital investment can support growth, while a temporary cash release can result from delaying supplier payments. Examine causes, sustainability and the company’s strategy.
Capital expenditure coverage and free cash flow
Capital expenditure coverage compares operating cash flow with cash spent on long-term assets. A value below 1 indicates that internal operating cash did not fully fund the period’s capital expenditure, so cash balances, asset sales, debt or equity may have funded the difference.
Free cash flow is often defined as operating cash flow less cash capital expenditure. Some analysts deduct only maintenance capital expenditure, but that amount may not be separately disclosed. State the definition and avoid presenting an estimate as an audited subtotal.
Worked ratio example
Assume operating cash flow is 360 CU, revenue is 2,400 CU, average current liabilities are 450 CU, operating profit is 300 CU and cash capital expenditure is 240 CU:
- Operating cash flow ratio: 360 ÷ 450 = 0.80
- Cash flow margin: 360 ÷ 2,400 × 100 = 15%
- Cash conversion of operating profit: 360 ÷ 300 = 1.20
- Capital expenditure coverage: 360 ÷ 240 = 1.50
- Free cash flow: 360 − 240 = 120 CU
The company generated more cash than operating profit and internally covered the reported capital expenditure. Further analysis should identify whether the strong conversion came from sustainable operations or a one-off working-capital release.
Interpret ratios as a set
ACCA’s ratio-analysis guidance notes that liquidity ratios should be considered alongside operating cash flow. IAS 7 provides the underlying operating, investing and financing information used in many cash-based measures.
Read cash ratios with:
- the current and quick ratios;
- receivables, inventory and payables days;
- profit margins and asset turnover;
- debt maturity and interest commitments;
- capital-expenditure plans and asset condition;
- several years of comparable figures.
Common limitations
- Classification choices: the placement of interest and dividends can affect operating cash flow.
- Seasonality: closing liabilities may not represent the average level.
- Acquisitions: acquired working capital can distort simple comparisons.
- One-off timing: delaying payments or accelerating collections can improve one period.
- Definition variation: free cash flow and debt service coverage are not always calculated consistently.
- Inflation and scale: long-term trends may require context beyond the raw ratio.
Analytical questions
- Is operating cash flow positive and recurring?
- Does cash conversion support reported profit over several periods?
- Are receivables or inventory absorbing increasing amounts of cash?
- Can operating cash fund necessary capital expenditure?
- Is debt service supported without repeated refinancing?
- Do management-defined measures reconcile to the statement of cash flows?
Related Accounting Support guides
Key takeaway
Cash-flow ratios are decision tools, not pass-or-fail tests. Define each formula, compare it over time and against business conditions, and explain the operating, investing and financing movements behind the result. See how cash flow links to other statements and IAS 7 classification.
Primary reference: IAS 7 Statement of Cash Flows.