The current ratio and the quick ratio both measure a business's ability to cover short-term obligations with short-term assets. The difference is scope: the current ratio counts every current asset, including inventory, while the quick ratio excludes inventory and other assets that are not quickly convertible to cash.
FORMULA
Current Ratio = Current Assets ÷ Current Liabilities
EXAMPLE
A business holds $910,000 in current assets against $350,000 in current liabilities.
Current Ratio = $910,000 ÷ $350,000 = 2.6.
The business has $2.60 in current assets for every $1.00 of current liabilities.
FORMULA
Quick Ratio = (Current Assets − Inventory − Prepaid Expenses) ÷ Current Liabilities
An alternative version builds the numerator up rather than down: Cash + Marketable Securities + Accounts Receivable, divided by current liabilities. Both produce the same result; the difference is whether you start from total current assets and subtract, or start from the liquid items and add.
EXAMPLE
Using the same business: $910,000 in current assets includes $420,000 of inventory and $10,000 of prepaid expenses.
Quick Ratio = ($910,000 − $420,000 − $10,000) ÷ $350,000 = 1.4.
Excluding inventory, the business still covers its current liabilities 1.4 times over.
Inventory is a current asset, but it is the least liquid one. Converting it to cash requires finding a buyer, which takes time and is not guaranteed at the value carried on the books, particularly for slow-moving or specialized stock. The quick ratio, also called the acid-test ratio, is built specifically to answer a narrower question: could this business meet its short-term obligations without relying on inventory sales at all.
The gap between the two ratios is itself informative. A current ratio of 2.6 alongside a quick ratio of 1.4 tells you a meaningful share of liquidity is tied up in inventory. If that gap were much wider, say a current ratio of 3.0 against a quick ratio of 0.6, it would signal that the business looks liquid on paper largely because of inventory that may be slow to convert.
Neither ratio has a universal target. Above 1.0 is a common rough benchmark for both, meaning current assets, or quick assets, at least cover current liabilities, but the right level depends heavily on industry norms and how predictably a business collects its receivables and moves its inventory.
Both ratios are calculated from a balance sheet snapshot, which means both are only as accurate as the underlying accounts payable and accounts receivable balances behind them. If invoices are sitting unprocessed rather than posted, current liabilities are understated, which makes both ratios look stronger than the business's actual short-term position.
This is the same accuracy dependency that runs through net working capital and the AP aging report: the ratio itself is calculated correctly, but the inputs feeding it are incomplete until the processing backlog behind them clears.
