The quick ratio (also called the acid-test ratio) measures whether a business can cover its current liabilities using only its most liquid assets — cash, accounts receivable, and marketable securities — without relying on selling inventory. A quick ratio of 1.0 means liquid assets exactly cover short-term obligations. Above 1.0 means a buffer; below 1.0 means the business depends on selling inventory or raising capital to meet short-term obligations.
The quick ratio is the conservative cousin of the current ratio. Where the current ratio includes inventory as a current asset, the quick ratio excludes it — recognizing that inventory often can't be converted to cash quickly enough to cover bills coming due. For service businesses and SaaS with little inventory, the quick ratio and current ratio are roughly equal. For retail, manufacturing, and restaurants where inventory is a large current asset, the quick ratio is meaningfully lower and tells the more honest story about near-term liquidity.
Quick Ratio = (Cash + Marketable Securities + Accounts Receivable) ÷ Current Liabilities or: Quick Ratio = (Current Assets − Inventory − Prepaid Expenses) ÷ Current Liabilities
Quick ratio is the right liquidity check for any business with material inventory. A retailer with a current ratio of 2.0 can look healthy on the balance sheet, but a quick ratio of 0.6 reveals that 70% of the apparent liquidity is locked up in inventory that may or may not sell on the timeline needed to pay suppliers. Lenders watch quick ratio carefully because it predicts the ability to repay during a sales slowdown — when inventory becomes harder to convert quickly. For owners, quick ratio is the cleanest single answer to "how much real liquidity do I have?"
Fynso calculates quick ratio weekly from your accounting and bank data, surfacing both the absolute number and the trend. When quick ratio drops below 1.0, the brief flags the cause: AR aging out, AP building, cash drawing down, or some combination. The break-down lets owners take specific action rather than vague "we should do something" responses. For businesses with seasonal patterns, Fynso compares quick ratio to the same period last year so the signal is meaningful, not just "down from peak."
Restaurant
A restaurant carries roughly $25K of food and beverage inventory but only $15K of cash and $5K of AR (most sales are cash). With $40K of current liabilities (rent, payroll, AP), the current ratio is 1.1 (apparently healthy) but the quick ratio is 0.5 — the business depends on this week's sales to cover this week's bills, which is how most restaurants live.
Specialty retail
A specialty retailer with $400K of inventory, $30K of cash, $20K of AR, and $180K of current liabilities has a current ratio of 2.5 but a quick ratio of 0.28. The business is solvent only as long as inventory keeps moving — a slow season can flip it from comfortable to scrambling in a few weeks.
Professional services
An agency with $150K of cash, $200K of AR, $0 inventory, and $80K of current liabilities has a quick ratio of 4.4 — strong by any measure. Service businesses with disciplined AR collection rarely have quick ratio problems; their risk is on the revenue side, not the liquidity side.
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