The acid test ratio, also called the quick ratio, measures whether a business can cover its short-term liabilities using only its most liquid assets, leaving out inventory. You calculate it as quick assets divided by current liabilities, where quick assets are cash, marketable securities and receivables. A result of 1.0 or higher means the business could clear its current debts without selling a single unit of stock.
It earns its name from the idea of an acid test: a fast, no-nonsense check of liquidity. By stripping out inventory, which can be slow or hard to sell at full value, it gives a more conservative read than the current ratio and a clearer picture of a company's ability to handle bills as they fall due. Lenders, suppliers and investors lean on it for exactly that reason. When someone needs a quick sense of whether a business can survive a short-term cash squeeze without a fire sale of stock, the acid test ratio is one of the first numbers they reach for.
Liquidity without stock.Quick assets divided by current liabilities. It excludes inventory on purpose.
1.0 is the line.At or above 1.0, liquid assets cover current debts. Below it, you may lean on selling stock.
Receivables are half the answer.If customers pay slowly, your quick assets are tied up and the ratio overstates real liquidity.
The acid test ratio formula is (cash plus marketable securities plus accounts receivable) divided by current liabilities. A common shortcut is (current assets minus inventory) divided by current liabilities. Both reach the same place: liquid assets over the debts due within a year. Enter your figures below to see the ratio and what it signals.
Quick assets exclude inventory. General information, not financial advice.
Worked through: a business with 40,000 cash, 10,000 in marketable securities and 50,000 in receivables has 100,000 of quick assets. Against 80,000 of current liabilities, that is an acid test ratio of 1.25, so it holds 1.25 of liquid assets for every 1.00 owed in the short term. Notice inventory never entered the calculation, which is the whole point.
A ratio of 1.0 or higher is generally considered healthy, meaning a business can meet its short-term obligations from liquid assets alone. Below 1.0 suggests it might need to sell inventory or raise finance to cover what it owes. But context matters more than the headline. As a loose guide, most businesses sit in one of three bands.
Liquid assets do not fully cover current debts, so the business may need to sell stock or raise finance. Worth a closer look, though some fast-inventory retailers run here safely.
Many analysts treat this as comfortable for most businesses: enough liquid cover without large idle balances.
Often fine, but worth questioning. A big pile of idle cash and uncollected receivables can mean money is not being put to work.
The direction of travel matters as much as the level. A steady decline, even from a healthy start, warns that cash is draining or short-term debts are building.
Industry shapes what counts as normal. Supermarkets and other fast-inventory retailers often run well below 1.0 quite safely, because stock turns into cash daily and suppliers extend generous terms, while a consultancy with no inventory should comfortably clear 1.0. As with most ratios, the trend over time and the comparison with industry peers tell you more than any single reading, so it is best used alongside other liquidity ratios rather than in isolation.
The difference is inventory: the current ratio includes it among current assets, while the acid test ratio excludes it. That single change makes the acid test the stricter of the two. The current ratio answers "can we cover short-term debts with all current assets?", while the acid test answers the harder question, "can we cover them without relying on selling stock?".
The gap between the two ratios is itself informative. If a company's current ratio looks comfortable but its acid test ratio is weak, a large share of its liquidity is locked up in inventory, which is risky if that stock is slow-moving or seasonal. A small gap means the business is not heavily inventory-dependent. The strictest member of the family is the cash ratio, which goes one step further and excludes receivables too, leaving only cash and securities; it answers what you could pay this instant. The acid test ratio is identical to the quick ratio; the two names describe exactly the same calculation.
| Measure | Formula | What it tells you |
|---|---|---|
| Acid test (quick) ratio | (Cash + securities + receivables) / current liabilities | Can short-term debts be met without selling inventory. The stricter test. |
| Current ratio | Current assets / current liabilities | Can short-term debts be met from all current assets, inventory included. |
| Cash ratio | (Cash + securities) / current liabilities | The strictest test: cover debts from cash alone, excluding receivables too. |
Reading the three together, from current to acid test to cash, shows how liquidity holds up as you remove each less-certain asset.
Accounts receivable usually make up the largest slice of quick assets, so the ratio is only as trustworthy as your receivables are collectible. The formula treats every dollar of receivables as good as cash, but that assumes customers actually pay. If a chunk of your receivables is overdue or unlikely to be recovered, the acid test ratio will flatter your real liquidity. In practice this means two businesses with an identical 1.2 ratio can be in very different shape: one collecting on time, the other sitting on receivables that are months late.
This is why slow collections quietly erode liquidity even when the ratio looks fine on paper. Tightening collections converts those receivables into genuine cash, which is what the ratio is really trying to measure. The cash conversion cycle calculator shows how quickly receivables, inventory and payables turn into cash, and stronger net working capital usually shows up as a healthier acid test ratio.
To turn the acid test ratio from a tidy textbook figure into an honest measure of cash you could actually lay hands on, read it next to the quality of your receivables.
Check the agingLook at how much of the receivable balance is current versus badly overdue.
Discount doubtful balancesInclude only the portion you genuinely expect to collect on time, stripping out amounts already provided for as doubtful.
Watch the cash actually arrivingTrack how fast payment is really landing, not just the balance on the ledger.
Mind the aged tailFor a business carrying a long tail of aged receivables, the honest figure can warn where the textbook one reassures.
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