Working Capital Calculator — Liquidity & Health Ratios

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

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Current Liabilities

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Working Capital Analysis

Working Capital–
Current Ratio–
Quick Ratio (Acid Test)–
Working Capital / Sales–
Health–

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What Working Capital Tells You

Working capital = Current Assets − Current Liabilities. Positive working capital means short-term assets cover short-term obligations. Negative working capital means you owe more than you can pay in the next 12 months — a major red flag for most businesses (though some, like Amazon historically, can run negative WC because they collect from customers before paying suppliers).

The Three Key Ratios

Working Capital = Current Assets − Current Liabilities
Current Ratio = Current Assets / Current Liabilities
Quick Ratio (Acid Test) = (Cash + AR + Other) / Current Liabilities
Working Capital % of Sales = WC / Annual Sales × 100
  • Current Ratio < 1.0: Insolvent on a 12-month basis.
  • Current Ratio 1.0–1.5: Tight — vulnerable to a bad month.
  • Current Ratio 1.5–3.0: Healthy zone.
  • Current Ratio > 3.0: Possibly carrying too much idle cash or inventory.
  • Quick Ratio > 1.0: Can pay all short-term debts even if all inventory is unsellable.

Worked Example

Example: Cash $50K + AR $80K + Inventory $60K + Other $10K = $200K current assets. AP $40K + Short-term debt $20K + Other $10K = $70K current liabilities. Working Capital = $130K. Current ratio = 2.86 (healthy). Quick ratio = 2.0 (very strong). WC / annual sales = 21.7% — typical for product-based business; SaaS would be much lower.

How to Optimise Working Capital

  • Reduce DSO (Days Sales Outstanding): invoice on shipment, automate reminders, charge late fees, factor receivables.
  • Manage inventory tightly: just-in-time, ABC analysis, dead-stock liquidation.
  • Stretch DPO (Days Payable Outstanding): negotiate longer terms, but never miss a deadline.
  • Use revolving credit lines: cheaper than dilution, sized for seasonal swings.
  • Track the cash conversion cycle: DSO + DIO − DPO. Lower is better. Best-in-class is negative.

Frequently Asked Questions

Is more working capital always better?▾
No. Excess working capital is idle capital. The goal is enough to absorb shocks, not so much that ROI suffers. Industry norms differ — retail keeps less, manufacturing more.
What’s the difference between current ratio and quick ratio?▾
Quick ratio excludes inventory because inventory may not be sellable quickly at full value. Quick ratio is the more conservative liquidity measure.
Can working capital be negative on purpose?▾
Yes — companies like Walmart and Amazon historically ran negative working capital. They collect from customers within days but pay suppliers in 60–90 days. The float effectively funds the business.
How is this different from cash flow?▾
Working capital is a balance-sheet snapshot at a point in time. Cash flow is the movement over a period. Both matter; both can disagree (a profitable business can have shrinking working capital if AR is ballooning).

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