What Is the SaaS Quick Ratio?
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The SaaS quick ratio measures how much recurring revenue a subscription company adds for every dollar it loses. You divide new and expansion monthly recurring revenue (MRR) by churned and contraction MRR. A result of 4 means the company added roughly four dollars for each dollar that left in the same period.
One thing first, because searchers mix these up. This is not the accounting quick ratio, also called the acid-test ratio. That one is a liquidity measure. The Business Development Bank of Canada defines it as quick assets (cash plus accounts receivable) divided by current liabilities, and says a business should ideally sit at 1:1 or higher. It asks whether you can pay your bills. The SaaS version asks whether your revenue base is growing faster than it leaks. Same name, different question, different inputs.
The Formula
SaaS quick ratio = (New MRR + Expansion MRR) / (Churned MRR + Contraction MRR)
Each term is a monthly flow, not a balance:
- New MRR: recurring revenue from customers who signed up this period.
- Expansion MRR: extra recurring revenue from existing customers through upgrades, added seats or cross-sells.
- Churned MRR: recurring revenue lost from customers who canceled.
- Contraction MRR: recurring revenue lost when existing customers downgrade but stay.
The numerator is everything pushing revenue up. The denominator is everything pulling it down. If you're new to the underlying revenue measure, ARR and MRR covers how recurring revenue is counted.
Tomasz Tunguz, a venture investor who has written extensively on SaaS metrics, gives the same definition and says it measures a SaaS company's growth efficiency.
Where the Metric Came From
The metric is credited to Mamoon Hamid, then a partner at Social+Capital. In a talk transcribed by SaaStr, Hamid describes it as brand-new revenue from new customers plus expansion revenue, divided by customers you've lost or who've contracted. In the same talk he says a bunch of data suggests that a quick ratio of four, or above, is quite desirable. Tunguz's analysis of the metric credits Hamid as "the creator of the Quick Ratio".
Notice how the 4 is framed. It is Hamid's investing heuristic, drawn from the companies he looked at. It is not a law of SaaS, and it isn't a figure that auditors, accounting bodies or any standards group publishes. When you see "a good quick ratio is 4" without a name attached, treat it as a rule of thumb from one investor that others adopted.
A Worked Example
The numbers below are illustrative, not drawn from a real company.
Suppose a startup begins the month with $100,000 in MRR.
| Item | MRR change |
|---|---|
| New MRR | +$12,000 |
| Expansion MRR | +$4,000 |
| Churned MRR | -$3,000 |
| Contraction MRR | -$1,000 |
Quick ratio = (12,000 + 4,000) / (3,000 + 1,000) = 16,000 / 4,000 = 4.0
Net new MRR is $12,000, so MRR grows from $100,000 to $112,000, or 12 percent for the month.
How to Read It
The ratio is a simple way to see the balance between growth and leakage. Hamid's own framing is that at 4, for every four dollars being added, the company is losing about a dollar. A rough reading looks like this:
- Below 1: the company is shrinking. More revenue leaves than arrives.
- Around 4 or above: the level Hamid used as his investing bar, which many investors still cite.
Treat those bands as a reading aid, not a grade. The right level depends on stage and model. A company selling large annual contracts to enterprises will usually have lower churn but lumpier new business than a self-serve product with thousands of small accounts.
Why It Needs a Growth Rate Next to It
A ratio is only a ratio. It says nothing about size, and a tiny base can flatter it.
Take two companies, both illustrative. Company A has $5,000 of MRR, adds $1,200 and loses $300 in a month. Its quick ratio is 4.0. Company B has $500,000 of MRR, adds $24,000 and loses $6,000. Its quick ratio is also 4.0.
Company A grew 18 percent for the month and Company B grew 3.6 percent. Same ratio, very different growth, and very different business. In a first-year company, a handful of customers can swing the number wildly. ChartMogul, a subscription analytics vendor, cautions that for companies in their first year the ratio isn't a reliable indicator of anything, since young customers are still inside commitment periods.
So read the ratio together with MRR growth rate. A high ratio with slow growth usually means the base is small or new business has stalled, and a lower ratio with fast growth can be fine if the company is deliberately buying growth.
How It Relates to Other Startup Metrics
The quick ratio overlaps with several better-known numbers. It helps to see what each one captures that the others don't.
Churn rate. Churn measures revenue or customers lost as a share of a starting base. The quick ratio folds churn into a ratio against growth, so it hides the absolute leak. Tunguz shows the catch: by his math, a startup growing 15 percent a month can hit a quick ratio of 4 while sustaining monthly churn and contraction of 5.0 percent, or 46 percent a year. He calls that unsustainably high. Fast growth can mask a leaky product.
Net revenue retention. NRR tracks what a fixed cohort of existing customers pays over time, including expansion and losses, and ignores new logos entirely. The quick ratio mixes new and existing revenue in one period. Use NRR to judge the installed base and the quick ratio to judge total momentum.
Burn multiple. Burn multiple, developed by David Sacks of Craft Ventures, is net burn divided by net new ARR. It prices growth in cash. A company can have a great quick ratio and still burn heavily to get there, so the two together say more than either alone.
SaaS magic number. The magic number relates new revenue to the sales and marketing spend that produced it. The quick ratio doesn't look at spend at all. If the quick ratio asks "is the bucket leaking?", the magic number asks "what does it cost to pour more in?"
Limitations
The quick ratio is useful because it's simple. The same simplicity creates blind spots.
- It ignores size. As shown above, tiny bases produce high ratios.
- It can hide churn. Fast new-business growth can paper over a high loss rate, as Tunguz's example shows.
- It ignores cost. A 4 reached by spending heavily on acquisition is not the same as a 4 reached cheaply. The ratio carries no information on customer acquisition cost.
- It shifts with scale. InsightSquared, as reported by ChartMogul, found that a ratio of 4 suits young, high-growth companies but that the equation changes at scale.
Common Mistakes
- Using the accounting quick ratio's benchmark. A SaaS ratio of 1 and an acid-test ratio of 1 mean entirely different things.
- Quoting 4 as a universal target. It is Hamid's threshold. Companies with different models can be healthy at other levels.
- Mixing time periods. Keep numerator and denominator on the same period, usually one month, and don't blend monthly and annual figures.
- Leaving out contraction. Counting only cancellations flatters the ratio. Downgrades are real lost revenue.
Key Facts
- The SaaS quick ratio is (new MRR + expansion MRR) divided by (churned MRR + contraction MRR) (Tomasz Tunguz).
- Mamoon Hamid, formerly of Social+Capital, is credited as its creator, and said in a SaaStr talk that data suggested a quick ratio of four or above is quite desirable (SaaStr).
- By Tunguz's calculation, a startup growing 15 percent per month can reach a quick ratio of 4 while sustaining 5.0 percent monthly churn and contraction, or 46 percent annually (Tunguz).
- ChartMogul cautions the ratio is not a reliable indicator for companies in their first year (ChartMogul).
- The accounting quick ratio is a different measure: quick assets divided by current liabilities, with 1:1 or higher the usual target (BDC).
- Burn multiple is net burn divided by net new ARR, and was developed by David Sacks of Craft Ventures (Corporate Finance Institute).
Frequently Asked Questions about the SaaS Quick Ratio
What is the SaaS quick ratio?
It is a growth-efficiency metric for subscription businesses. You divide new and expansion MRR by churned and contraction MRR for the same period. A higher number means revenue is being added much faster than it's being lost.
Is the SaaS quick ratio the same as the accounting quick ratio?
No. The accounting quick ratio, or acid-test ratio, compares liquid assets such as cash and receivables to current liabilities and measures short-term solvency. The SaaS quick ratio compares revenue gained to revenue lost and measures growth efficiency. They share a name and nothing else.
What is a good SaaS quick ratio?
Mamoon Hamid, who created the metric, treated 4 or above as the level he considered desirable when investing. That is one investor's threshold, not a universal standard. Stage, pricing model and customer size all change what is healthy, so use it as a reference point and not a pass or fail test.
Who invented the SaaS quick ratio?
Mamoon Hamid, then a partner at Social+Capital, is credited with it. Tomasz Tunguz refers to him as its creator, and Hamid discussed it in a talk transcribed by SaaStr.
Why can a high quick ratio be misleading?
Because it's a ratio, not a measure of size or absolute loss. A very small company can post a high number from a few new customers, and a fast-growing company can reach 4 while still losing a large share of revenue each month. Check the underlying churn and the growth rate.
How is the quick ratio different from net revenue retention?
Net revenue retention follows a fixed cohort of existing customers and ignores new customers. The quick ratio includes new customer revenue in the numerator. NRR tells you about the health of the installed base, while the quick ratio shows overall momentum.
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