Definition
Quick Ratio (Acid-Test Ratio)
A liquidity ratio that measures a company's ability to pay short-term obligations using only its most liquid assets, calculated as (Current Assets − Inventory) / Current Liabilities. It is a stricter test than the current ratio because it excludes inventory, which may not be quickly convertible to cash. The quick ratio is always equal to or less than the current ratio, and a value above 1.0 suggests the company can cover near-term obligations without having to sell inventory.
A company has current assets of $500,000, including $150,000 of inventory, and current liabilities of $200,000. Quick ratio = ($500,000 − $150,000) / $200,000 = 1.75, meaning it can cover its short-term debts 1.75 times using only its most liquid assets. Its current ratio, which keeps inventory in the numerator, is 2.5.
The only difference between the quick ratio and the current ratio is that the quick ratio removes inventory from the NUMERATOR; nothing changes in the denominator. Because inventory can only be zero or positive, the quick ratio can never exceed the current ratio, and when the two are equal the company carries zero (or negligible) inventory. Students also mislabel it as a leverage measure; it measures liquidity, while debt-to-equity measures leverage.
How is Quick Ratio (Acid-Test Ratio) tested on the exam?
- Calculating the quick ratio from current assets, inventory, and current liabilities
- Identifying inventory exclusion as the single difference between the quick ratio and the current ratio
- Recognizing the quick ratio as the stricter (more stringent) of the two liquidity tests
- Inferring inventory levels from the gap between a company's current ratio and quick ratio
- Classifying ratios correctly: current and quick measure liquidity, debt-to-equity measures leverage
Calculation example
Calculation Example
Quick Ratio = (Current Assets − Inventory) / Current Liabilities - Identify current assets: $500,000
- Identify inventory: $150,000
- Identify current liabilities: $200,000
- Subtract inventory from current assets: $500,000 − $150,000 = $350,000
- Divide by current liabilities: $350,000 / $200,000 = 1.75
Acid test: gold prospectors dripped acid on metal to see if it was the real thing. The quick ratio drips acid on the balance sheet and the inventory dissolves away, leaving only the assets liquid enough to pay the bills right now. What survives the acid is what counts.
Practice questions
Test your understanding with the questions below. Pick an answer to reveal the explanation.
An investment adviser is comparing two companies in the same industry. Company A has a current ratio of 1.8 and a quick ratio of 0.9. Company B has a current ratio of 1.5 and a quick ratio of 1.4. What can the adviser conclude?
A is correct. The gap between the current ratio and quick ratio reveals inventory levels, because inventory is the only item removed between the two. Company A's large gap (1.8 down to 0.9) means inventory makes up a substantial share of its current assets; Company B's small gap (1.5 down to 1.4) means minimal inventory.
B confuses liquidity ratios with leverage; neither ratio here says anything about debt financing. C reads the wrong ratio: strict liquidity is the quick ratio's job, and Company B's 1.4 beats Company A's 0.9. D overstates the evidence; zero inventory would make the two ratios exactly equal, and Company B's still differ (1.5 versus 1.4).
The Series 65 exam rewards reading the current-versus-quick gap as an inventory signal. A company can look liquid on the current ratio while its quick ratio shows it depends on selling inventory to pay its bills.
The quick ratio differs from the current ratio because the quick ratio:
A is correct. Quick Ratio = (Current Assets − Inventory) / Current Liabilities. Inventory is excluded because it may not be quickly convertible to cash, making the quick ratio a stricter liquidity test.
B is incorrect; accounts receivable stay in the numerator as a liquid asset. C is incorrect; the denominator (current liabilities) is identical in both ratios, and inventory adjusts the numerator, not the denominator. D describes neither ratio; both use current assets, not total assets.
Knowing exactly which line item moves (inventory) and where it moves from (the numerator) is the single most tested quick ratio fact on the Series 65 exam.
A company has current assets of $600,000, inventory of $200,000, and current liabilities of $250,000. What is the quick ratio?
C is correct. Quick Ratio = ($600,000 − $200,000) / $250,000 = $400,000 / $250,000 = 1.60.
A divides inventory by current liabilities ($200,000 / $250,000), which is not a meaningful ratio. B subtracts inventory from the wrong side, adding it to the denominator instead ($600,000 / $450,000). D forgets to exclude inventory entirely ($600,000 / $250,000), which produces the current ratio, not the quick ratio.
Distractor D (the current ratio) appears in nearly every quick ratio calculation question on the Series 65 exam. If you did not subtract inventory, you calculated the wrong ratio.
All of the following statements about the quick ratio are accurate EXCEPT
D is correct (the EXCEPT answer). The quick ratio measures liquidity, the ability to meet short-term obligations. Reliance on debt financing is leverage, which the debt-to-equity ratio measures.
A is accurate: removing inventory (which is zero or positive) from the numerator can only lower the ratio or leave it unchanged. B is accurate: slow conversion to cash is exactly why inventory is excluded. C is accurate: excluding the least liquid current asset makes the test stricter.
The Series 65 exam tests ratio classification directly: current and quick are liquidity ratios, debt-to-equity is a leverage ratio. Mislabeling the category is a common wrong answer.
Which of the following statements about the quick ratio are accurate?
1. If a company has zero inventory, its quick ratio equals its current ratio
2. The quick ratio can exceed the current ratio when inventory is substantial
3. The quick ratio is also known as the acid-test ratio
4. The quick ratio measures the ability to meet short-term obligations using the most liquid assets
C is correct. Statements 1, 3, and 4 are accurate.
Statement 1 is TRUE: with no inventory to subtract, the two formulas produce identical results. Statement 2 is FALSE, and backwards: subtracting inventory can only reduce the numerator, so the quick ratio never exceeds the current ratio; a substantial inventory widens the gap in the other direction. Statement 3 is TRUE: acid-test ratio is the standard alternate name. Statement 4 is TRUE: that is the definition of the quick ratio.
Statement 2 tests the always-relationship the Series 65 exam expects you to know cold: quick ratio is less than or equal to the current ratio, with equality only at zero inventory.
Where does Quick Ratio (Acid-Test Ratio) appear on the Series 65 exam?
This term is tested in the following Series 65 exam topics: