Quick Ratio (Acid Test)

The quick ratio is the current ratio's stricter cousin — it asks 'can you pay your bills without selling inventory?' It's a better test of true liquidity.

Definition

The quick ratio, also called the acid-test ratio, is a conservative liquidity metric that measures a company's ability to pay current liabilities using only its most liquid assets — cash, marketable securities, and receivables. It excludes inventory because inventory may take time to sell and may not fetch full value.

Formula

Quick Ratio = (Current Assets - Inventory) / Current Liabilities

Quick (Acid-Test) Ratio

Like current ratio but excludes inventory — a stricter test

Current Assets Breakdown

$60M

$55M

Cash

Receivables

Inventory

Inventory is excluded because it may not be quickly convertible to cash. A retailer sitting on unsold goods has a weaker liquidity position than the current ratio suggests.

Current Ratio

1.89x

$170M / $90M

Quick Ratio

1.28x

$115M / $90M

Current Ratio

Can the company cover its short-term obligations?

Current AssetsCash + Receivables + Inventory

$170M

1.0x threshold

Current LiabilitiesPayables + Short-term Debt

$90M

equals

Current Ratio

1.89x

$170M / $90M

Above 1.0x — company can cover short-term debts

Liquidity by Industry

The gap between current and quick ratio reveals inventory dependence

Technology

Current

2.8x

Quick

2.5x

Retail

Current

1.5x

Quick

0.6x

Large gap (0.9x) — heavy inventory reliance

Manufacturing

Current

1.9x

Quick

1.1x

Large gap (0.8x) — heavy inventory reliance

Current Ratio

Quick Ratio

Why Exclude Inventory?

Inventory is excluded because it is the least liquid current asset. Converting inventory to cash requires finding a buyer, and in distressed situations inventory may sell at steep discounts. For manufacturers and retailers with large inventory balances, the gap between the current ratio and quick ratio can be significant, revealing dependence on inventory liquidation.

Interpreting the Quick Ratio

A quick ratio of 1.0x or above means the company can pay off all current liabilities without selling any inventory. Below 1.0x is not automatically bad — many healthy companies (especially retailers) operate below 1.0x because their inventory turns over quickly. The ratio is most useful for companies with slower inventory turnover or when assessing distress risk.

Quick Ratio in Credit Analysis

Credit analysts and lenders use the quick ratio as part of their liquidity assessment when underwriting loans. A declining quick ratio over time signals deteriorating liquidity. Banks may include minimum quick ratio requirements as financial covenants in credit agreements, particularly for borrowers in inventory-heavy industries.

Worked Example — With Real Numbers

A company has current assets of $800M (including $250M of inventory) and current liabilities of $500M. Quick Ratio = ($800M - $250M) / $500M = 1.1x. Current Ratio = 1.6x. The 0.5x gap shows material reliance on inventory for liquidity.

Key Takeaways

Quick ratio strips out inventory to show whether a company can meet obligations with liquid assets alone

A ratio of 1.0x+ is generally considered safe, meaning all current liabilities are covered

The gap between current ratio and quick ratio reveals inventory dependence

Credit agreements often include minimum quick ratio covenants

Common Mistakes in Interviews

Forgetting to also exclude prepaid expenses in the strictest definition of quick ratio

Using the quick ratio for asset-light businesses (like SaaS) where it adds little insight over the current ratio

Not considering that high receivables can inflate the quick ratio — receivables quality matters too

How Interviewers Test This

Know the difference between current ratio and quick ratio cold. A great follow-up: 'When would the quick ratio give a very different picture from the current ratio?' Answer: inventory-heavy businesses like manufacturing or retail.