Financial ratios are standardized measures that allow comparison across companies, time periods, and industries. Liquidity ratios measure a company's ability to meet short-term obligations. Efficiency ratios (also called activity ratios) measure how well management deploys its assets to generate revenue. Together, they form the first two legs of a comprehensive ratio analysis framework — the foundation for understanding how a business operates before assessing how profitable or how risky it is.
Liquidity measures how quickly a company can convert assets to cash to pay obligations due within one year. Three ratios provide progressively more conservative views of short-term solvency:
Cash Conversion Cycle — DIO + DSO − DPO
Illustrative manufacturing company · CCC = 50 + 36 − 30 = 56 days
Operating Timeline
Day 0 → Day 86
Days Inventory Outstanding (DIO)
50 days
Purchase inventory → Sell to customer
Days Sales Outstanding (DSO)
36 days
Sale recorded → Cash collected from customer
Days Payable Outstanding (DPO)
30 days
Using supplier's money (free float)
Cash Conversion Cycle (CCC = funding gap)
56 days
← Company must finance this gap with own capital →
50d
DIO
+
36d
DSO
−
30d
DPO
=
56d
CCC
Industry
DIO
DSO
DPO
Typical CCC
E-commerce / large retail
30–50d
2–5d
45–60d
Negative to 0
Manufacturing
50–80d
35–50d
30–45d
45–80d
B2B Software
0d
30–50d
15–30d
15–35d
Figure 3.1 — The red zone represents days the company must fund from its own capital. DPO (green) is the supplier-financed portion that reduces the burden. Negative CCC means customers fund operations.
| Ratio | Formula | What It Measures | Benchmark | Key Limitation |
|---|---|---|---|---|
| Current ratio | Current assets ÷ Current liabilities | Broad short-term coverage — everything liquid within one year vs. everything due within one year | >2.0x comfortable; <1.0x watch; <1.5x scrutinize | Includes inventory, which may be slow-moving or unsaleable; includes prepaid expenses that can't be used to pay bills |
| Quick ratio (Acid-test) | (Cash + Short-term investments + AR) ÷ Current liabilities | More conservative — excludes inventory and prepaid (harder to quickly convert to cash) | >1.0x comfortable; <0.5x potentially stressed | AR quality matters: high AR with old invoices may be uncollectable; quick ratio can still be misleading if AR is stale |
| Cash ratio | Cash + Short-term investments ÷ Current liabilities | Most conservative — only the most liquid assets; can the company pay bills tomorrow without collecting anything? | >0.5x generally sufficient; highly industry-dependent | Overly conservative for healthy businesses — most companies don't need to hold enough cash to pay all current liabilities immediately |
A grocery retailer (Kroger, Walmart) might have a current ratio of 0.7x — and be perfectly healthy. Why? Grocers receive cash from customers instantly but pay suppliers in 30–60 days. Their business model creates structurally low current ratios because they finance working capital through their suppliers. Compare to a capital equipment manufacturer with a 3.5x current ratio — they may have $200M in inventory that takes 18 months to convert to sales. The 3.5x ratio looks strong but the inventory may be the riskiest asset on the balance sheet. Always interpret ratios relative to industry norms, not absolute standards.
Efficiency (activity) ratios measure the speed at which the company cycles through its working capital components. The key ratios use 'days' as their unit — how many days of sales, cost, or purchases are tied up in each account:
| Ratio | Formula | What It Measures | Better When... |
|---|---|---|---|
| Days Sales Outstanding (DSO) | AR ÷ (Revenue ÷ 365) | Average days to collect cash after making a sale; how long money sits in AR | Lower — collect faster, fewer financing costs, lower default risk |
| Inventory Turnover | COGS ÷ Average Inventory | How many times inventory is fully cycled per year | Higher — less cash tied up in inventory, lower obsolescence and storage risk |
| Days Inventory Outstanding (DIO) | 365 ÷ Inventory Turnover (or: Inventory ÷ (COGS ÷ 365)) | Average days inventory sits before being sold | Lower — faster inventory cycle; but too low can mean stockouts and lost sales |
| Days Payable Outstanding (DPO) | AP ÷ (COGS ÷ 365) | Average days to pay suppliers after receiving goods/services | Higher (within limits) — using supplier credit to finance the business; but too high damages supplier relationships and access to supply |
Revenue = $1,000M; COGS = $700M; AR = $55M; Inventory = $140M; AP = $105M. DSO = $55M ÷ ($1,000M ÷ 365) = 20.1 days. DIO = $140M ÷ ($700M ÷ 365) = 73.0 days. DPO = $105M ÷ ($700M ÷ 365) = 54.7 days. Cash Conversion Cycle = DSO + DIO − DPO = 20.1 + 73.0 − 54.7 = 38.4 days. This company has $38.4 days of operating cycle that it must finance with its own capital — every day in the CCC represents (Revenue ÷ 365) × 1 day of capital tied up.
The cash conversion cycle (CCC) integrates all three efficiency ratios into a single measure of how many days of cash a company needs to fund its operating cycle:
Key Takeaways
A company has: Cash = $50M; AR = $80M; Inventory = $120M; Prepaid expenses = $10M; Current liabilities = $160M. Calculate current ratio and quick ratio.