Working Capital Calculator
Measure the cash cushion between what you own short-term and what you owe short-term — and check the one ratio that reveals whether that cushion is actually liquid or just sitting in stock.
- Updated Aug 17, 2026
- Reviewed by the BSF CPA Editorial Team
- US small business
- 9 min read
Working capital = current assets − current liabilities. With $200,000 of current assets against $70,000 of current liabilities you have $130,000 of working capital, a current ratio of 2.86 and a quick ratio of 2.00. The current ratio counts inventory; the quick ratio does not — and for a stock-heavy business the two can tell opposite stories.
Enter your cash, receivables, inventory and other current assets, then your payables, short-term debt and other current liabilities. Annual sales is optional and drives the efficiency ratio.
Working capital is the cushion that keeps a business operating. Too little, and you can’t pay suppliers next week. Too much, and capital is sitting idle when it could be earning. This calculator gives you working capital, the current ratio, the quick ratio (acid test), and a quick health verdict.
Working Capital Calculator
Measure short-term liquidity — working capital, current ratio, and acid-test ratio.
Current Assets
Current Liabilities
Working Capital Analysis
How to read your results
| Output | What it means | Why it matters |
|---|---|---|
| Working capital | Current assets − current liabilities | The dollar cushion. Negative means near-term obligations exceed near-term resources. |
| Current ratio | Current assets ÷ current liabilities | The standard liquidity test. Counts inventory as though it were cash. |
| Quick ratio | (Current assets − inventory) ÷ current liabilities | The stricter test. This is the one lenders look at for stock-heavy businesses. |
| Working capital to sales | Working capital ÷ annual sales | An efficiency measure — how much capital each dollar of revenue ties up. |
| Health rating | Strong, Healthy, Tight or At Risk | A quick label. See the caveat below — it is based on the current ratio alone. |
What working capital measures
Working capital is the money available to run day-to-day operations. Current assets are what you expect to turn into cash within a year — cash itself, receivables, inventory, prepaid expenses. Current liabilities are what falls due within a year — payables, short-term debt, accrued expenses, the current portion of longer-term loans.
The gap between them is your buffer. Positive working capital means you can meet the next twelve months of obligations from resources already on the balance sheet. Negative working capital means you are relying on future trading to cover commitments already made — survivable for a supermarket that collects cash instantly and pays suppliers in 60 days, dangerous for almost everyone else.
Profitability and liquidity are different things. A profitable business can run out of cash if its money is locked in unsold stock and unpaid invoices, and this is one of the more common ways otherwise sound businesses fail.
The formula
current liabilities = payables + short-term debt + other current liabilities
working capital = current assets − current liabilities
current ratio = current assets ÷ current liabilities
quick ratio = (current assets − inventory) ÷ current liabilities
WC to sales = working capital ÷ annual sales
- quick Also called the acid-test ratio. Strips out the least liquid current asset.
- sales Optional. Used only for the efficiency ratio; leave at zero to ignore it.
Current ratio vs quick ratio
This is the distinction that matters most, and the reason to read both numbers rather than one. Take four businesses with identical current assets of $220,000 and identical current liabilities of $70,000 — so an identical current ratio of 3.14 — differing only in how much of those assets is inventory rather than receivables:
| Inventory | Receivables | Current ratio | Quick ratio | Rating shown |
|---|---|---|---|---|
| $0 | $200,000 | 3.14 | 3.14 | Strong |
| $60,000 | $140,000 | 3.14 | 2.29 | Strong |
| $120,000 | $80,000 | 3.14 | 1.43 | Strong |
| $180,000 | $20,000 | 3.14 | 0.57 | Strong |
All four rows above are rated Strong, including the last — a business with only 57 cents of liquid assets for every dollar due within the year. Its current ratio looks excellent because $180,000 of stock is counted as though it were cash.
If you carry meaningful inventory, judge yourself on the quick ratio, not the rating. A quick ratio below 1.0 means you cannot meet current liabilities without selling stock — and stock only converts at the speed your customers buy it, which is exactly what fails in a downturn.
How the health rating works
The rating maps directly to current-ratio bands:
| Current ratio | Rating | Reading |
|---|---|---|
| 2.00 and above | Strong | Comfortable cushion. Check it is not idle capital. |
| 1.20 – 1.99 | Healthy | Workable for most businesses. |
| 1.00 – 1.19 | Tight | Little margin for a late payment or slow month. |
| Below 1.00 | At Risk | Current liabilities exceed current assets. |
Zero current liabilities returns "At Risk". If you enter no payables, debt or accruals, the ratios divide by zero and display 0.00, which falls into the lowest band — even though owning assets with no short-term debt is the strongest position possible. Enter your actual liabilities, however small, to get a meaningful reading.
Negative working capital displays as "$-50,000" rather than "−$50,000". Formatting only; the figure is correct.
Three worked examples
$60,000 cash, $90,000 receivables, $10,000 other; $45,000 payables, $15,000 short-term debt, $10,000 other
Working capital $90,000, current ratio 2.29, quick ratio 2.29 — identical, because there is no inventory to strip out. Rated Strong, and here the rating is trustworthy. Working capital to sales is 12.0% on $750,000 of revenue.
$25,000 cash, $35,000 receivables, $180,000 inventory, $10,000 other; $140,000 total current liabilities
Working capital $110,000 and a current ratio of 1.79 earn a Healthy rating. But the quick ratio is 0.50 — only fifty cents of liquid assets per dollar owed within the year. This business is one slow season away from trouble, and the headline figures do not say so. Working capital to sales is 12.2%.
$15,000 cash, $60,000 receivables, $70,000 inventory, $5,000 other; $160,000 total current liabilities
Working capital is −$10,000, the current ratio 0.94 and the quick ratio 0.50. Rated At Risk, correctly. Current liabilities exceed current assets, so the business depends on future trading to meet commitments already made.
Working capital as an efficiency measure
More working capital is not automatically better. Capital tied up in stock and receivables is capital not earning a return elsewhere. The working-capital-to-sales ratio shows how much you are tying up per dollar of revenue:
| Annual sales | Working capital | WC to sales | Reading |
|---|---|---|---|
| $400,000 | $130,000 | 32.5% | Heavy — capital sitting idle |
| $600,000 | $130,000 | 21.7% | Typical for many small businesses |
| $900,000 | $130,000 | 14.4% | Efficient |
| $1,500,000 | $130,000 | 8.7% | Very efficient — watch it does not become tight |
The same $130,000 cushion is comfortable at $400,000 of sales and lean at $1.5m. There is a genuine tension here: a high current ratio means safety, but it can also mean slow collections, excess stock and cash doing nothing. The goal is enough buffer to absorb shocks, not the largest number you can achieve.
Common mistakes
Reading the current ratio alone
It counts inventory as if it were cash. The four businesses in the table above share a 3.14 current ratio and quick ratios from 3.14 down to 0.57.
Omitting the current portion of long-term debt
The next twelve months of loan principal is a current liability. Leaving it out overstates working capital, sometimes substantially.
Counting receivables you will not collect
Overdue invoices are not liquid. Deduct doubtful debts before entering the figure, or the ratios flatter you.
Valuing inventory optimistically
Obsolete or slow-moving stock will not convert at book value. Both ratios assume it will.
Assuming a high ratio is always good
A current ratio of 4 may mean idle cash and bloated stock. Compare against your sales, not against zero.
Treating it as a one-off check
Working capital moves constantly with seasons and collection cycles. A single snapshot can be unrepresentative in either direction.
Best practices
Track the quick ratio if you hold stock
It is the number that tells you whether you can pay next quarter without a good sales month. Below 1.0 deserves attention.
Measure at the same point each period
Month-end after payroll looks different from mid-month. Consistency matters more than which date you pick.
Attack the cycle, not the balance
Faster collections and better payment terms improve working capital without needing more capital. Chase receivables before seeking a loan.
Compare within your industry
Retail, manufacturing and services carry structurally different ratios. A supermarket runs negative working capital by design.
Frequently asked questions
What is a good working capital ratio?
A current ratio between 1.2 and 2.0 suits most businesses. Below 1.0 means current liabilities exceed current assets; well above 2.0 may indicate capital sitting idle in stock, receivables or cash.
What is the difference between the current and quick ratios?
The quick ratio excludes inventory. If the two are far apart, most of your liquidity is stock — which only converts to cash when customers buy. For inventory-heavy businesses the quick ratio is the more honest figure.
Why does the rating say Strong when my quick ratio is low?
The health rating is based on the current ratio alone, which counts inventory. A stock-heavy business can be rated Strong on a 3.14 current ratio while holding a 0.57 quick ratio. Read both numbers.
Can working capital be negative?
Yes, and it is not always fatal. Businesses that collect from customers immediately and pay suppliers on terms — supermarkets, some restaurants — often run negative working capital deliberately. For most others it signals strain.
Why does entering zero liabilities show "At Risk"?
Because the ratios divide by current liabilities. With zero, they return 0.00, which falls into the lowest band. Enter your actual payables and accruals, however small, for a meaningful result.
What counts as a current liability?
Anything due within twelve months: trade payables, accrued expenses, taxes payable, short-term borrowing, credit card balances, and the portion of long-term loans repayable in the next year.
Should I include prepaid expenses?
They belong in other current assets under standard presentation, but they never become cash — they become expense. If liquidity is your concern, consider excluding them and reading the quick ratio.
How do I improve working capital?
Collect receivables faster, turn inventory more often, and negotiate longer supplier terms. Each frees cash without new borrowing. Converting short-term debt to long-term also helps the ratios, though not the underlying business.
How does this differ from cash flow?
Working capital is a snapshot of the balance sheet at a point in time. Cash flow measures money moving over a period. A business can show healthy working capital and still run out of cash if the timing does not line up.
Do lenders look at these ratios?
Yes. Current and quick ratios are standard in credit assessment, and loan agreements often include covenants requiring a minimum current ratio. Breaching one can trigger default even when payments are current.
What is a good working-capital-to-sales ratio?
Commonly 10–20% for small businesses, but it varies widely by sector. Much above that suggests capital tied up unnecessarily; much below suggests you may be running too lean to absorb a shock.
How often should I check it?
Monthly for most businesses, and always before taking on debt, signing a lease or committing to a large stock purchase. Seasonal businesses should track it across a full cycle rather than at one point.
Methodology & sources
Current assets are the sum of cash, receivables, inventory and other current assets; current liabilities the sum of payables, short-term debt and other current liabilities. Working capital is the difference. The current ratio divides current assets by current liabilities and the quick ratio does the same after removing inventory. Working capital to sales expresses the cushion as a percentage of annual revenue and returns zero when sales are left blank. The health rating is derived from the current ratio alone — Strong at 2.00 and above, Healthy from 1.20, Tight from 1.00, At Risk below 1.00 — and therefore does not reflect inventory concentration. Where current liabilities are zero, both ratios return 0.00 and the rating falls to the lowest band.
- Standard liquidity ratio analysis as applied in US financial accounting and credit assessment.
- US Small Business Administration — working capital and cash management guidance.
- All figures independently modelled and verified against the live calculator.
Related resources
- Cash Flow CalculatorMoney moving, not money sitting
- Break-Even CalculatorVolume needed to cover costs
- Profit Margin CalculatorProfitability alongside liquidity
- Payback Period CalculatorBefore you tie capital up further
- Markup CalculatorPricing that funds the cycle
- All CalculatorsThe full BSF library
Check the quick ratio before you trust the rating
If you carry stock, the gap between your two ratios is the real story — and it is the number a lender will look at first.
Goes deeper on this
13-Week Cash Flow Forecast (Excel)
The rolling quarter-ahead forecast lenders ask for and owners actually use. It flags the week you run short, not the week after.
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