Efficiency Ratios
How well is the company using its assets and managing working capital?
How efficiency ratios work
Efficiency ratios measure how well a company converts its assets and working capital into sales and cash. Asset turnover and inventory turnover show how hard the balance sheet is working per dollar invested. DSO, DIO, and DPO each measure a different leg of the operating cycle in days — how long it takes to collect from customers, how long inventory sits before selling, and how long the company takes to pay its own suppliers. The Cash Conversion Cycle combines all three into a single number: the total days cash is tied up before it flows back in.
For example, a company with $50,000 in accounts receivable and $500,000 in annual revenue has a DSO of ($50,000 / $500,000) × 365 ≈ 36.5 days — it takes about five weeks on average to collect on a sale. Combined with a DIO of 40 days and a DPO of 30 days, its Cash Conversion Cycle is 36.5 + 40 − 30 = 46.5 days of cash tied up in operations. Efficiency ratios measure operational management, not overall profitability or safety — pair them with the Profitability Ratios calculator for margins and returns, or the Liquidity Ratios calculator for short-term financial safety.
Asset Turnover
Asset Turnover = Revenue ÷ Average Total Assets
Asset turnover measures how many dollars of revenue the company generates for every dollar of assets it holds. A ratio of 1.5× means the company generates $1.50 of revenue per $1 of assets. Use average assets (beginning + ending balance ÷ 2) for accuracy. Asset-light businesses (software, consulting) typically run 1–3×; capital-intensive industries (manufacturing, utilities) often run below 0.5×. In DuPont analysis, asset turnover is the middle factor in the ROE decomposition — see the DuPont Analysis calculator.
Inventory Turnover
Inventory Turnover = COGS ÷ Average Inventory
Inventory turnover shows how many times the company sells through and replaces its inventory stock in a period. Use COGS rather than revenue — since inventory is valued at cost, using COGS gives a like-for-like comparison. A ratio of 6× means inventory is fully turned over every two months. High turnover (10×+) indicates strong sales or lean inventory management; very low turnover (below 3×) can signal slow-moving or obsolete stock. Days Inventory Outstanding (DIO) = 365 ÷ Inventory Turnover converts this to the number of days inventory sits before being sold.
Days Sales Outstanding (DSO)
DSO = (Accounts Receivable ÷ Revenue) × 365
DSO measures the average number of days it takes to collect payment after a sale. Accounts receivable is money owed by customers for goods or services already delivered — found on the balance sheet as a current asset. A DSO of 30 days means the company collects payment about one month after invoicing. Lower is better: a DSO rising over time signals customers are paying more slowly, which squeezes cash flow even as revenue grows. B2B businesses typically run 30–60 days; B2C (cash sales) run near zero.
Days Payable Outstanding (DPO)
DPO = (Accounts Payable ÷ COGS) × 365
DPO measures how long the company takes to pay its own suppliers. Accounts payable is money owed to suppliers for goods and services already received — found on the balance sheet as a current liability. Unlike DSO, higher DPO is generally better: paying suppliers later preserves cash in the business. However, stretching payables beyond agreed terms can damage supplier relationships and lead to less favourable pricing. Large retailers often run DPO of 60–90 days; smaller businesses typically 30–45 days.
Cash Conversion Cycle (CCC)
CCC = DIO + DSO − DPO
The Cash Conversion Cycle is the net number of days cash is tied up in the operating cycle — from paying for raw materials, through production and storage, to collecting from customers. A lower CCC (even negative) is better: Amazon famously runs a negative CCC because it collects from customers before it has to pay suppliers, effectively getting interest-free financing from its supply chain. A rising CCC is a warning sign that the company is taking longer to convert operations into cash — which can strain liquidity even in a growing business.
Frequently asked questions
- How do the DSO/DIO/DPO tabs relate to the Cash Conversion Cycle tab?
- Calculate DSO, DIO, and DPO in their own tabs and each result automatically populates the matching field in the Cash Conversion Cycle tab. Shared inputs like Cost of Goods Sold and Revenue are also synchronised across every tab that uses them as you type. You can still overwrite any pre-filled value manually if you want to plug in figures from elsewhere.
- Why would a company want a negative cash conversion cycle?
- A negative cycle means suppliers are effectively financing the business — the company collects from customers and sells inventory faster than it has to pay its own suppliers, a hallmark of efficient retailers.
- What do efficiency ratios measure?
- Efficiency ratios measure how well a company manages its assets and working capital — how quickly it turns inventory into sales, collects cash from customers, and pays its own suppliers — rather than how profitable it is in absolute terms.
- What is a good Days Sales Outstanding (DSO)?
- A DSO of 30–45 days is typical for businesses with standard net-30 payment terms. A DSO significantly higher than your stated payment terms suggests collection problems; a very low DSO suggests strict credit terms or a large share of upfront/cash sales.
- What is the Cash Conversion Cycle and why does it matter?
- The Cash Conversion Cycle (DSO + DIO − DPO) measures how many days cash is tied up in the operating cycle before it comes back in as collections. A shorter cycle means less working capital is needed to run the business day to day, freeing up cash for other uses.
- Is a high or low DPO better?
- A higher DPO means the company is taking longer to pay suppliers, which improves its own cash position — but push it too far and you risk damaging supplier relationships or losing early-payment discounts. There's a balance between optimising your own cash cycle and maintaining good supplier terms.
- How do efficiency ratios differ by industry?
- Grocery and fast-fashion retailers turn inventory over rapidly (high inventory turnover, low DIO) because they sell high volumes of perishable or fast-moving goods. Heavy manufacturing and capital goods businesses turn inventory over much more slowly. Always benchmark efficiency ratios against same-industry peers.
- How do I use the Cash Conversion Cycle to improve working capital?
- Target each component individually: collect receivables faster (lower DSO) by tightening credit terms or following up sooner, sell through inventory faster (lower DIO) by improving demand forecasting, and negotiate longer payment terms with suppliers (higher DPO) where relationships allow — all three shrink the cycle and free up cash.