Two companies with the same profit margin can earn very different returns if one turns its assets into sales much faster than the other. Efficiency ratios — also called activity or turnover ratios — measure how well a company uses its assets and manages working capital. They link directly to liquidity, profitability and cash flow.
What you will learn
- Calculate total and fixed asset turnover
- Calculate inventory, receivable and payable turnover and days
- Calculate the operating cycle and cash conversion cycle
- Interpret changes in efficiency and their effect on cash
Asset turnover
Asset turnover ratios
Total asset turnover = Revenue ÷ Average total assets
Fixed asset turnover = Revenue ÷ Average net property, plant and equipment
A turnover of 1.2 means each unit of assets generates 1.2 units of sales a year. Capital-intensive industries (utilities, telecoms) have low turnover; retailers and distributors have high turnover. Asset turnover is one of the three drivers of return on equity in DuPont analysis.
Working capital efficiency
Turnover and days ratios
Inventory turnover = Cost of sales ÷ Average inventory; Days inventory outstanding (DIO) = 365 ÷ Inventory turnover
Receivables turnover = Revenue (credit sales if known) ÷ Average receivables; Days sales outstanding (DSO) = 365 ÷ Receivables turnover
Payables turnover = Cost of sales (or purchases) ÷ Average payables; Days payables outstanding (DPO) = 365 ÷ Payables turnover
Days measures are often easier to interpret than turnover ratios: "customers take 57 days to pay" is clearer than "receivables turn 6.3 times a year".
The operating cycle and cash conversion cycle
The cycles
Operating cycle = DIO + DSO
Cash conversion cycle (CCC) = DIO + DSO − DPO
The cash conversion cycle is the number of days the company must finance from its own resources between paying suppliers and collecting from customers. Shorter is generally better for cash flow. The operating cycle and cash conversion cycle calculators compute both.
Worked example: Company A’s lengthening cycle
Company A (illustrative figures; year-end balances used for simplicity):
| Year 1 | Year 2 | |
|---|---|---|
| Revenue | 8,000 | 9,200 |
| Cost of sales | 5,200 | 5,980 |
| Inventory | 1,300 | 1,700 |
| Trade receivables | 1,100 | 1,450 |
| Trade payables | 900 | 1,100 |
| Total assets | 7,000 | 8,000 |
| Measure | Year 1 | Year 2 |
|---|---|---|
| DIO = Inventory ÷ Cost of sales × 365 | 91.3 days | 103.8 days |
| DSO = Receivables ÷ Revenue × 365 | 50.2 days | 57.5 days |
| DPO = Payables ÷ Cost of sales × 365 | 63.2 days | 67.1 days |
| Cash conversion cycle | 78.3 days | 94.2 days |
| Asset turnover (year-end assets) | 1.14× | 1.15× |
The cash conversion cycle lengthened by about 16 days. What did that cost in cash? Daily revenue in Year 2 is 9,200 ÷ 365 ≈ 25.2. Had DSO stayed at 50.2 days, receivables would have been about 50.2 × 25.2 ≈ 1,265 instead of 1,450 — roughly 185 of cash tied up by slower collection alone. Together with the inventory build-up, this explains why operating cash flow fell while profit rose.
Interpreting efficiency ratios
- Rising inventory days may mean slow-moving or obsolete stock, overproduction or deliberate stockpiling ahead of price rises or supply disruption. Check the notes for write-downs.
- Rising receivable days may mean looser credit terms to boost sales, collection problems or customers in difficulty. An ageing schedule shows how much is overdue.
- Rising payable days improves cash flow, but may also signal difficulty paying suppliers. Very long payable days can damage supplier relationships.
- Falling asset turnover may reflect under-used capacity, recent large investments not yet producing sales, or declining sales.
Seasonality matters: a retailer’s inventory just before a festival season is much higher than average. Use average balances or quarterly data where possible. Practical improvements are covered in working capital management.
Industry differences
| Business type | Typical pattern |
|---|---|
| Supermarket | Very short inventory and receivable days; long payable days; CCC can be negative |
| Manufacturer | Long inventory days (raw materials, work in progress, finished goods) |
| Construction | Long receivable cycles tied to project milestones |
| Software / services | Little inventory; receivable days drive the cycle |
Common mistakes
- Using revenue instead of cost of sales for inventory turnover, which overstates turnover.
- Using year-end balances for a fast-growing or seasonal business without noting the distortion.
- Assuming longer payable days are always good.
- Comparing days measures calculated with 360 and 365 days without adjusting.
Key terms
- Asset turnover — revenue divided by total assets.
- Days inventory outstanding — average days inventory is held before sale.
- Days sales outstanding — average days taken to collect receivables.
- Days payables outstanding — average days taken to pay suppliers.
- Cash conversion cycle — DIO + DSO − DPO.
Frequently asked questions
Can the cash conversion cycle be negative?
Yes. Businesses that sell quickly for cash and pay suppliers later — such as many supermarkets — are partly financed by their suppliers.
Which figure should I use for receivables turnover?
Credit sales are ideal, but companies rarely disclose them, so total revenue is commonly used. Be consistent when comparing.
Why does efficiency matter for profitability?
Return on assets equals net margin multiplied by asset turnover. Faster turnover raises returns even at the same margin.
Key takeaways
- Asset turnover measures how much revenue each unit of assets generates.
- Inventory, receivable and payable days measure working capital efficiency.
- Cash conversion cycle = DIO + DSO − DPO; a longer cycle ties up more cash.
- Interpret changes with seasonality, industry norms and the notes in mind.