The formula
The current ratio is the business question in one number: can the business pay the bills due in the next year. Take the business’s current assets — what it can turn into cash within a year: cash, accounts receivable, inventory and short-term investments — and divide them by its current liabilities, what it must pay within a year: accounts payable, short-term debt and accrued expenses. A current ratio of 1.50 means the business holds $1.50 for every $1.00 of short-term bills. This guide works the calculation in seven steps.
Step 1 — Add up the current assets
Start with what the business can turn into cash within a year: the cash in the bank, the accounts receivable, the inventory on the shelves and any short-term investments. Add them together — that is the current assets. Leave out the long-term assets: the building, the equipment and the vehicles stay out. On the worked example the current assets are $150,000.00.
Step 2 — Add up the current liabilities
Now add up what the business must pay within a year: the accounts payable, the short-term debt and the accrued expenses. That is the current liabilities. Do not include the long-term debt: a mortgage or a five-year loan stays out, because the ratio only measures the bills due in the next year. On the worked example the current liabilities are $100,000.00.
Step 3 — Divide the assets by the liabilities
Divide the current assets by the current liabilities. That is the current ratio. On the worked example it is $150,000.00 ÷ $100,000.00 = 1.50. The business holds $1.50 for every $1.00 of short-term bills, so it sits inside the healthy 1.50–2.00 range. Rounded to two decimals: 2.00 on $200,000.00 of assets, 1.20 on $120,000.00, and 0.90 on $90,000.00 — below 1.00.
Step 4 — Work out the working capital
Subtract the current liabilities from the current assets to get the working capital — the cushion left over after the short-term bills. On the worked example it is $150,000.00 − $100,000.00 = $50,000.00. A positive working capital means the bills are covered with something to spare; a negative one, like $−10,000.00 on $90,000.00 of assets, means the bills exceed the short-term assets.
Step 5 — Work out the assets the bar needs
Multiply the target ratio by the current liabilities to find the current assets the business must hold. On the worked example the target is 1.50, so the assets needed are 1.50 × $100,000.00 = $150,000.00. At the 2.00 bar they are 2.00 × $100,000.00 = $200,000.00, and at the 1.25 bar they are 1.25 × $100,000.00 = $125,000.00.
Step 6 — Work out the most liabilities the bar allows
Divide the current assets by the target ratio to find the most current liabilities the bar allows. On the worked example it is $150,000.00 ÷ 1.50 = $100,000.00. At the 2.00 bar it is $150,000.00 ÷ 2.00 = $75,000.00. This is how a lender sizes the room: the most the business can owe in the next year while staying above the bar.
Step 7 — Check the result against the healthy range
Compare the ratio with the healthy range of 1.50 to 2.00. On the worked example the ratio is 1.50 and the bar is 1.50, so the business meets the bar exactly, with $50,000.00 of working capital left over — the 0.50 of headroom the 1.50 ratio gives. Check it: $150,000.00 − $100,000.00 = $50,000.00, the working capital. One warning: the reverses are judged on the UNROUNDED ratio — at $149,999 the unrounded ratio is 1.499990, shown as 1.50 only after rounding, still below the line.
Three worked examples
The headline example: $150,000.00 of current assets and $100,000.00 of current liabilities. The ratio is $150,000.00 ÷ $100,000.00 = 1.50, the working capital is $150,000.00 − $100,000.00 = $50,000.00, and the current assets needed at the 1.50 bar are $150,000.00. $200,000.00 of assets instead: the ratio is 2.00 and the working capital is $100,000.00. $75,000.00 of liabilities instead: the ratio is 2.00. Use the current ratio calculator to run your own numbers.
Two reverses to check your answer
The smallest whole-dollar current assets for the ratio to reach 1.50 is $150,000 — at $150,000 the ratio is 1.50, and at $149,999 the unrounded ratio is 1.499990, shown as 1.50 only after rounding, still below the line. The largest whole-dollar current liabilities for the ratio to STAY at or above 1.50 is $100,000 — at $100,000 the ratio is 1.50, and at $100,001 the unrounded ratio is 1.499985, shown as 1.50 only after rounding, still below the line.
What counts, and what does not
Current assets are what the business can turn into cash within a year: cash, accounts receivable, inventory and short-term investments. Current liabilities are what it must pay within a year: accounts payable, short-term debt and accrued expenses. Long-term assets and long-term debt stay out — the building, the equipment and the mortgage are not due in the next year. The trap is the inventory and the receivables: the ratio counts them at face value, but stock that never sells and bills that never get paid are not cash, and a lender will discount them.
What to do below 1.00
A ratio below 1.00 means the business owes more in the next year than it holds in short-term assets. On $90,000.00 of current assets and $100,000.00 of current liabilities the ratio is 0.90 and the working capital is $−10,000.00. The fixes are the formula’s three levers: raise the assets, cut the liabilities, or both. Collect receivables faster, sell slow inventory or put in cash; pay down short-term debt or stretch the payables. The smallest whole-dollar current assets that reach 1.00 are $100,000 — at $99,999 the unrounded ratio is 0.999990, shown as 1.00 only after rounding, still below the line.
What a ratio above 3.00 means
A ratio above 3.00 does not mean three times as safe — it may mean idle assets the business could put to work. On $150,000.00 of current assets and $50,000.00 of current liabilities the ratio is 3.00 and the working capital is $100,000.00. Cash in the bank earns little, inventory on the shelves earns nothing, and unpaid receivables earn nothing either. The healthy range tops out at 2.00 for a reason: above it, the question is not whether the bills are covered, but whether the assets are working.
How the current ratio differs from the quick ratio
The quick ratio is the current ratio with the inventory taken out: (current assets − inventory) ÷ current liabilities. It is the stricter test, because inventory is the slowest current asset to turn into cash. A business at 1.50 on the current ratio and 1.00 on the quick ratio holds a third of its short-term assets as inventory. The current ratio answers whether the bills are covered if everything sells; the quick ratio answers whether they are covered if nothing sells. Lenders watch both, and the gap tells you how much of the cushion depends on the inventory moving.