What the SaaS quick ratio measures
The SaaS quick ratio compares the recurring revenue a business adds in a period with the recurring revenue it loses. It is a single number for growth efficiency: how many dollars of new and expansion MRR you gain for every dollar of MRR lost to cancellations and downgrades.
SaaS quick ratio = (new MRR + expansion MRR) ÷ (churned MRR + contraction MRR)
A quick ratio of 4 means the business added $4 of recurring revenue for every $1 it lost. A ratio of 1 means it ran in place. Below 1, recurring revenue shrank.
ChartMogul's article on the SaaS quick ratio credits Mamoon Hamid, then a venture investor at Social+Capital, with introducing the metric at the SaaStr conference in 2015. Tomasz Tunguz's 2015 analysis uses the same formula and also credits Hamid as its creator.
The name causes confusion. In corporate finance, the quick ratio (or acid-test ratio) is a liquidity measure comparing liquid assets with current liabilities. The SaaS quick ratio has nothing to do with liquidity; it is purely about recurring revenue movements.
The inputs
The quick ratio uses the same MRR movement categories as an MRR waterfall:
- New MRR: recurring revenue from customers who started paying in the period.
- Expansion MRR: increases from existing customers, such as upgrades, extra seats, or add-ons.
- Churned MRR: recurring revenue lost when customers cancel entirely.
- Contraction MRR: decreases from customers who stay but pay less.
Some teams also add reactivation MRR (returning former customers) to the numerator. That is reasonable, but say so, because it changes the result. Stripe's Billing analytics documentation tracks reactivation as its own MRR movement alongside new, expansion, contraction, and churn, so the data is usually available separately.
If you need a refresher on how these movements are defined, see what is MRR and MRR vs ARR.
Worked example: calculating the SaaS quick ratio
A SaaS business records these movements in September:
- new MRR: $6,000;
- expansion MRR: $1,500;
- churned MRR: $1,800;
- contraction MRR: $400.
Quick ratio = ($6,000 + $1,500) ÷ ($1,800 + $400) = $7,500 ÷ $2,200 ≈ 3.4
Net new MRR is $7,500 − $2,200 = $5,300. If the business started September at $60,000 MRR, it grew by $5,300 ÷ $60,000 ≈ 8.8% in the month.
Now a second business also adds $5,300 of net new MRR from the same $60,000 starting point:
- new MRR: $9,000;
- expansion MRR: $800;
- churned MRR: $3,900;
- contraction MRR: $600.
Quick ratio = $9,800 ÷ $4,500 ≈ 2.2
Both companies grew by the same amount. The second one had to acquire half again as much new MRR to get there, because it lost more than twice as much. If acquisition slows for either company, the second will stall much sooner. That difference is exactly what the quick ratio is designed to expose. ChartMogul's article makes the same point with two hypothetical companies that each add $8,000 of net MRR, one at a ratio of 5 and the other at 2.
How to interpret the number
ChartMogul's article groups results roughly as:
- below 2: new revenue is mostly replacing lost revenue;
- 2 to 4: churn and contraction are taking a substantial share of growth;
- 4 and above: growth is high relative to losses.
The figure of 4 comes from Hamid's investing heuristic, as described by ChartMogul, and it is aimed at young, high-growth venture-backed companies. It is not a law. ChartMogul cites InsightSquared's view that 4 is a good benchmark for young, high-growth companies but that the equation changes as companies reach scale.
Context changes the reading considerably:
- Stage. A mature business with a large base can have a modest quick ratio and still be very healthy, because even low percentage churn is a large dollar amount relative to new sales.
- Business model. A bootstrapped, profitable product growing steadily may never hit 4 and does not need to.
- Seasonality. Monthly ratios swing with launches, holidays, and annual renewal dates. Use a trailing three-month or quarterly figure.
What the quick ratio hides
The quick ratio's biggest weakness is that a high growth rate can mask high churn. Tunguz's analysis showed that at a quick ratio of 4, a company growing 10%, 15%, or 20% per month could be losing 3.3%, 5.0%, or 6.7% of its MRR each month, which he translated to annual revenue losses of roughly 33%, 46%, and 56%. He called those churn levels unsustainably high. The ratio looked healthy only because acquisition was so fast.
You can see the arithmetic directly. If monthly churn plus contraction is L percent of MRR and the quick ratio is Q, then gains are Q × L and monthly net growth is:
Net growth rate = (Q − 1) × L
At Q = 4 and L = 5%, net growth is 3 × 5% = 15%. When acquisition slows, Q falls, but L stays at 5%.
Other limitations:
- Small denominators. With very little churn, the ratio becomes huge and meaningless. A month with $50 of churn and $3,000 of new MRR has a ratio of 61.
- Young businesses. ChartMogul notes the ratio is unreliable in a company's first year, when customers are new or still within commitment periods.
- Annual contracts. Churn arrives only at renewal, so monthly ratios can look excellent until renewal season.
- Period choice. Monthly, quarterly, and annual quick ratios can differ substantially.
Always read the quick ratio alongside gross revenue churn and net revenue retention, and check churn with the churn rate formulas.
Improving the SaaS quick ratio
There are only four levers, and the two in the denominator are usually cheaper to pull:
- Reduce involuntary churn: retry failed payments, send card-update reminders, and monitor past-due accounts.
- Reduce voluntary churn: improve onboarding, find the reasons behind cancellations, and offer a pause or downgrade path where appropriate.
- Increase expansion: price on a value metric that grows with usage, add seats or tiers customers naturally grow into.
- Increase new MRR: acquisition is the obvious lever but the most expensive; check unit economics with the LTV:CAC calculator.
Track the ratio with the components visible. A rising ratio driven by falling churn is more durable than one driven by a temporary acquisition push.
The quick ratio in a sale or fundraising process
Investors and acquirers use the quick ratio as a quick screen, then look at underlying cohorts. Present it with the four inputs, the period, whether reactivations are included, and the trend over at least several quarters. A buyer will want to rebuild it from subscription records.
RevenueBug's public profiles show trailing 30-day revenue calculated from connected payment-provider data. That figure helps a buyer see the overall revenue trend, but it is not split into new, expansion, contraction, and churned MRR, so it cannot produce a quick ratio on its own; the methodology explains what the figure includes. Pair a verified revenue profile with a monthly MRR movement report. Use the SaaS churn and retention calculator to check the retention side, and the SaaS valuation calculator to see how growth and retention assumptions affect value.
Common quick ratio mistakes
Using cash instead of MRR movements. Annual prepayments and one-time fees are not new MRR.
Treating plan changes as churn plus new. A customer moving between plans should be expansion or contraction, not a full cancellation and a new sale, or both sides of the ratio are inflated.
Hiding reactivations. Include or exclude them, but disclose the choice.
Reporting a single great month. Use trailing periods.
Comparing across companies without definitions. Two quick ratios are only comparable if MRR and movement categories are defined the same way.
Frequently asked questions
What is the SaaS quick ratio formula?
(New MRR + Expansion MRR) ÷ (Churned MRR + Contraction MRR). Some teams add reactivation MRR to the numerator; disclose it if you do.
What is a good SaaS quick ratio?
A ratio of 4 is the commonly cited benchmark for young, high-growth venture-backed companies, based on Mamoon Hamid's investing heuristic. Mature and bootstrapped businesses can be healthy at lower ratios. Above 1 means recurring revenue is growing.
Is the SaaS quick ratio the same as the financial quick ratio?
No. The financial quick ratio measures liquidity. The SaaS quick ratio measures recurring revenue gained versus lost.
Can a high quick ratio hide a churn problem?
Yes. Tunguz showed that a ratio of 4 can coexist with monthly churn of 5% or more when acquisition is very fast. Check gross churn directly.
How often should I calculate the quick ratio?
Monthly for internal tracking, but report a trailing three-month or quarterly figure to smooth out one-off launches and renewal timing.
What does a quick ratio below 1 mean?
The business lost more recurring revenue than it added in that period, so MRR declined.