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Quick Ratio Calculator

Also called the acid-test ratio. The more conservative liquidity test — can you cover your bills without selling a single unit of inventory? Industry-specific zones, plain-English diagnosis, AR concentration warnings.

Not sure where to find these numbers in your books? See where to find them in QuickBooks, Wave, or your accountant's report.

Choose an industry to see how your numbers compare to typical businesses like yours.

Cash, accounts receivable, inventory, prepaid expenses, short-term investments.

The portion of current assets that's inventory — what gets subtracted in the quick ratio.

Accounts payable, accrued expenses, current portion of long-term debt.

Enter your current assets, inventory, and current liabilities to see your quick ratio.

What quick ratio actually tells you

Quick ratio strips out inventory from current assets and asks: can you cover your near-term bills with cash, AR, and other near-cash assets alone? It's the acid test — the more conservative read on liquidity, designed for the case where inventory might not sell as quickly or at the prices you expect.

The relationship to current ratio is straightforward but matters: quick ratio is current ratio minus the inventory cushion. For inventory-heavy businesses (manufacturing, retail, some e-commerce), that cushion can be meaningful — a 2.0 current ratio might be 1.1 quick. For service businesses with little inventory, the two are nearly identical.

Bankers and creditors care about quick ratio specifically when they suspect inventory might be slow-moving, mis-valued, or industry-distressed. In a tightening credit environment, the quick ratio is the one they look at.

The formula

Quick Ratio = (Current Assets − Inventory) ÷ Current Liabilities

Stricter version (acid test):
Quick Ratio = (Current Assets − Inventory − Prepaids) ÷ Current Liabilities

The standard version excludes only inventory; the stricter version also excludes prepaid expenses on the grounds that prepaids can't be turned back into cash to pay bills. Most owner-operators don't need the stricter version — but if a banker asks for your acid-test ratio specifically, they may mean the stricter one. The calculator above offers both.

A worked example

A small manufacturing company has:

  • Cash: $80,000
  • Accounts receivable: $180,000
  • Inventory: $240,000
  • Prepaid expenses: $20,000
  • Total current assets: $520,000
  • Current liabilities: $260,000

Current ratio = $520,000 ÷ $260,000 = 2.00x.

Quick ratio (standard) = ($520,000 − $240,000) ÷ $260,000 = 1.08x.

Quick ratio (strict, excluding prepaids) = ($520,000 − $240,000 − $20,000) ÷ $260,000 = 1.00x.

The current ratio of 2.0x looks comfortable, but the standard quick ratio of 1.08x reveals that the comfort comes almost entirely from inventory. If that inventory turns slowly, or if it's aging or obsolete, the real liquidity is much thinner than the headline number suggests. This is why bankers and sophisticated buyers look at quick ratio — it strips away the cushion that can be illusory.

Industry-specific zones

Quick ratio expectations vary by how inventory-heavy the industry is, but the spread is narrower than for current ratio because the inventory effect is excluded:

  • Professional services: typically 1.0–2.0. Little inventory, so quick ratio runs close to current ratio. A services business below 1.0 has either AR or payables problems.
  • Construction and trades: typically 0.9–1.7. Work-in-progress and materials add some gap to current ratio. Retainage can suppress AR meaningfully.
  • Manufacturing: typically 0.8–1.5. The largest gap between current and quick because inventory (raw materials, WIP, finished goods) is a big part of current assets.
  • Retail: typically 0.7–1.4. Inventory-heavy. Quick ratio below 1.0 is common and not necessarily a problem if inventory turns fast.
  • Restaurants and food service: typically 0.7–1.3. Perishable inventory means it's a small share of current assets — but cash and AR are also thin, so quick ratio runs lower than other service businesses.
  • E-commerce: typically 0.8–1.5. Inventory and shipping in transit affect the ratio; ad spend and platform fees pull on payables.

The calculator above uses these zones to flag your specific number against industry expectation. A 0.8 quick ratio is yellow for services and green for retail — same number, different meaning, different action.

When quick ratio matters more than current ratio

The two ratios answer different questions, and one or the other dominates depending on the situation:

  1. Slow-moving inventory. If your inventory turns every 6+ months (run inventory turnover to check), the current ratio overstates your real liquidity meaningfully. Quick ratio is the more honest read.
  2. Aging or potentially obsolete inventory. Tech products, fashion, perishable goods, custom-spec items — anything where the realizable value is uncertain. Current ratio assumes the book value; quick ratio doesn't depend on that assumption.
  3. Tight credit environments. Lenders shift to quick ratio when they're cautious. If your covenants are current-ratio-based and credit is tightening, expect questions about the underlying quick ratio.
  4. Acquisition due diligence. Buyers haircut inventory in their analysis. Quick ratio is closer to what a buyer's diligence will show.
  5. Industries where inventory value is genuinely uncertain. Construction WIP, custom manufacturing, agricultural commodities. The quick ratio removes the largest source of valuation ambiguity.

The AR concentration trap

When you exclude inventory, AR usually becomes the largest component of quick assets. That has its own risk: AR strength is only as good as collection speed. A quick ratio of 1.5x where most of the "quick" is aging AR isn't much comfort.

The calculator flags this when cash is a small share of quick assets:

  • Cash share below 15%: explicit warning. Most of your quick liquidity depends on AR collecting on schedule. Run DSO and check AR aging — anything over 60 days needs attention.
  • Cash share 15–25%: soft note. Collection speed matters more than the headline number suggests.
  • Cash share above 25%: no warning. AR is a normal component, not a dominant one.

The pattern that catches owners by surprise: rising quick ratio driven by aging AR. The number looks better, but the underlying health is worse. Track both quick ratio and DSO together.

Common mistakes

  1. Treating quick ratio below 1.0 as automatic failure. For inventory-heavy industries, quick ratio below 1.0 is normal and not a concern if inventory turns fast. Use industry-specific zones.
  2. Ignoring AR composition. A 1.5x quick ratio with mostly aging AR is weaker than a 1.0x quick ratio with mostly cash. Run DSO and aging.
  3. Mixing the standard and strict versions. If your bank asks for "quick ratio" and your covenant references one specific version, find out which one and compute that one. The two versions can produce meaningfully different numbers.
  4. Computing once a year. Quick ratio moves faster than current ratio because it lacks the inventory buffer. Track quarterly minimum, monthly if cash flow is tight.
  5. Using book inventory value when computing. The point of quick ratio is conservative liquidity assessment. Subtract all inventory at book — don't try to include "the fast-moving portion" or apply your own haircut. The whole calculation rests on excluding inventory entirely.

FAQ

What's the difference between quick ratio and acid-test ratio?

They're the same ratio with different names. Some sources use "acid-test" specifically for the stricter version that excludes prepaids; others use the terms interchangeably. The calculator above offers both.

Should I use quick ratio or current ratio?

Both. They answer different questions. Current ratio is the standard test of short-term solvency including the inventory cushion. Quick ratio is the conservative test that strips the cushion away. For inventory-heavy businesses, the gap between the two is informative — it tells you how much your apparent liquidity depends on inventory selling as expected. For service businesses, the two converge and only one is needed.

My bank covenant says "quick ratio above 1.0." What version does that mean?

Read your loan agreement closely — most define the formula explicitly. If it's ambiguous, ask. Most commercial banks use the standard version (excluding inventory only); some aggressive lenders or specialty lenders use the strict version (also excluding prepaids). Don't guess.

What about "super quick" or "cash ratio"?

Cash ratio (also called the "super quick" ratio) is the strictest version: cash and equivalents divided by current liabilities. It excludes both inventory AND AR — testing whether you could pay all current liabilities tomorrow with what's already in the bank. Most healthy small businesses don't have a cash ratio above 1.0 and don't need to. It's mostly used for distressed situations or for businesses with highly seasonal cash flow.

Can quick ratio be zero?

Yes — when all current assets are inventory. Most businesses aren't in this position, but it can happen with pure retailers running on tight cash management or restaurants in the days before a major delivery. A persistent quick ratio of zero is a warning sign regardless of industry.