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Acid Test Ratio

Step-by-Step Guide to Understanding the Acid Test Ratio

Last Updated January 9, 2024

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Acid Test Ratio

How to Calculate Acid Test Ratio

Liquidity is among one of the most important aspects of a company and its long-term viability.

The acid-test ratio and current ratio are two frequently used metrics to measure near-term liquidity risk, or a company’s ability to quickly pay off liabilities coming due in the next twelve months.

  • Acid Test Ratio (i.e. Quick Ratio)
  • Current Ratio

The steps to calculate the two metrics are similar, although the noteworthy difference is that illiquid current assets — e.g. inventory — are excluded in the acid-test ratio.

The acid-test ratio compares the near-term assets of a company to its short-term liabilities to assess if the company in question has sufficient cash to pay off its short-term liabilities.

Liquid Current Assets in Acid-Test Ratio:

  • Cash & Equivalents
  • Marketable Securities
  • Accounts Receivable (A/R)

Current Assets in Current Ratio:

  • Cash & Equivalents
  • Marketable Securities
  • Accounts Receivable (A/R)
  • Inventory
  • Other Current Assets

If a company were to suddenly be required to pay off the entirety of its short-term liabilities, inventory is usually more time-consuming to liquidate (i.e. to sell and turn into cash) compared to marketable securities — which is where the acid-test ratio comes in.

Acid Test Ratio Formula

The formula for calculating the acid test starts by determining the sum of cash and cash equivalents and accounts receivable, which is then divided by current liabilities.

Acid Test Ratio = (Cash and Cash Equivalents + Accounts Receivable) ÷ Current Liabilities

For purposes of comparability, the formula for calculating the current ratio is shown here to observe why the former metric is deemed more conservative.

Current Ratio = Current Assets ÷ Current Liabilities

As one would reasonably expect, the value of the acid-test ratio will be a lower figure since fewer assets are included in the numerator. Hence, the acid-test ratio is more conservative in terms of what is classified as a current asset in the formula.

How to Perform Liquidity Analysis with the Acid Test Ratio

For example, imagine you’re tasked with calculating a company’s acid test ratio given the following balance sheet data:

Current Assets:

  • Cash and Cash Equivalents = $20 million
  • Marketable Securities = $15 million
  • Accounts Receivable (A/R) = $25 million
  • Inventory = $60 million

Here, the total current assets are $120 million and the liquid current assets is $60 million.

Current Liabilities:

  • Accounts Payables = $30 million
  • Short-Term Debt = $25 million

Then, the required inputs are entered into the two formulas:

  • Acid-Test Ratio = ($20 million + $15 million + $25 million) ÷ ($30 million + $10 million) = 1.5x
  • Current Ratio = ($20 million + $15 million + $25 million + $60 million) ÷ ($30 million + $10 million) = 3.0x

The current ratio in our example calculation is 3.0x while the acid-test ratio is 1.5x, which is attributable to the inclusion (or exclusion) of inventory in the respective calculations.

What is a Good Acid-Test Ratio?

The general rule of thumb for interpreting the acid-test ratio is that the higher the ratio, the less risk attributable to the company (and vice versa). Likewise, the same guidelines apply to the current ratio.

  • Higher Acid-Test Ratio → Increased Coverage of Current Liabilities
  • Lower Acid-Test Ratio → Decreased Coverage of Current Liabilities

Either liquidity ratio indicates whether a company — post-liquidation of its current assets — is going to have sufficient cash to pay off its near-term liabilities.

Therefore, the higher the acid-test ratio, the better the short-term liquidity health of the company.

The “floor” for both the quick ratio and current ratio is 1.0x, however, that reflects the bare minimum, not the ideal target.

In particular, a current ratio below 1.0x would be more concerning than a quick ratio below 1.0x, although either ratio being low could be a sign that liquidity might soon become a concern.

A company with a low current or quick ratio should likely proceed with some degree of caution, and the next step would be to determine how much more capital and how quickly it could be obtained.

Acid Test Ratio Calculator

We’ll now move to a modeling exercise, which you can access by filling out the form below.


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Acid Test Ratio Calculation Example

The model assumptions we’ll be using for our hypothetical company can be found below.

Current Assets:

  • Cash and Cash Equivalents: $20m (Increases by $5m per Year)
  • Marketable Securities: $15m (Increases by $2m per Year)
  • Accounts Receivable (A/R): $25m (Increases by $2m per Year)
  • Inventory: $80m (Increases by $40m per Year)

Current Liabilities:

  • Accounts Payable: $65m (Increases by $5m per Year)
  • Short-Term Debt: $85m (Increases by $10m per Year)

In Year 1, the current ratio can be calculated by dividing the sum of the liquid assets by the current liabilities.

  • Current Ratio, Year 1: ($20m Cash + $15m Marketable Securities + $25m A/R + $80m Inventory) ÷ $145m (Current Liabilities) = 1.0x

Next, we apply the acid-test ratio formula in the same period, which excludes inventory, as mentioned earlier.

  • Quick Ratio, Year 1: ($20m Cash + $15m Marketable Securities + $25m A/R) ÷ $145m (Current Liabilities) = 0.4x

From Year 1 to Year 4, the following changes occur across the forecast period:

  • Current Ratio: 1.0x → 1.5x
  • Acid-Test Ratio: 0.4x → 0.5x

The current ratio is benefiting from the growth in the inventory balance, which is beneficial for debt lenders requiring capital (i.e. collateral), but the accumulation of inventory usually results from lower revenue due to lower market demand.

Since the target range for the current ratio is between 1.5x to 3.0x, the company appears to be in relatively good health based on its current ratio.

However, the acid-test ratio implies a different story regarding the liquidity of the company, as it is below 1.0x.

In closing, we can see the potentially significant differences that may arise between the two liquidity ratios due to the inclusion or exclusion of inventory in the calculation of current assets.

Acid Test Ratio Calculator

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May 19, 2023 11:48 pm

Very interesting explanations, easy to understand from basic to advance .Keep it up.

Brad Barlow
May 22, 2023 3:33 pm

Thanks, Johnson

November 19, 2022 1:58 am

This was so helpful
I’m so grateful

Brad Barlow
November 21, 2022 3:19 pm
Reply to  Folafoluwa

You’re very welcome, glad it was helpful!

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