The SaaS quick ratio compares new and expansion MRR to churn and contraction MRR. Above 4 is healthy; below 2 signals a leaky bucket.
The SaaS quick ratio is one of the most underrated growth-efficiency metrics: (New MRR + Expansion MRR) ÷ (Churn MRR + Contraction MRR). It answers a single, unforgiving question: for every dollar of MRR we lose, how many dollars are we adding? A ratio above 4 means growth is compounding meaningfully. Below 2 means most of your acquisition effort is just replacing the customers walking out the back door. Below 1 means you're shrinking. The metric strips away vanity and reveals whether the underlying business is actually building or just running in place.
New MRR: revenue from newly acquired customers this period. Expansion MRR: revenue growth from existing customers (upgrades, seat additions, usage expansion). Churn MRR: revenue lost from customers who cancelled. Contraction MRR: revenue lost from existing customers who downgraded or reduced usage. Sum the top two, sum the bottom two, divide. Do it monthly. The ratio smooths naturally at scale; at low volumes single accounts can distort it, so quarterly rollups are more reliable for small businesses.
Above 4: healthy growth machine. Every dollar lost is replaced 4x. Common in top-quartile early-stage SaaS. 2-4: acceptable but leaky. Growth happens, but a meaningful share of acquisition spend goes to filling the churn bucket. 1-2: nearly stagnant. New acquisition barely outruns losses. Usually a signal that either retention is broken or growth investment has slowed. Below 1: shrinking. New logos and expansion aren't enough to cover churn. Immediate diagnostic work required. Note: pre-scale companies with tiny denominators can show wildly high ratios (12x, 20x) that don't mean much.
A quick ratio of 5 driven entirely by new logo acquisition looks great but hides poor expansion (a product that doesn't grow with customers). A quick ratio of 5 driven entirely by expansion looks great but hides weak new-logo acquisition (dependence on installed base). The ratio itself doesn't distinguish. Always look at the four components separately alongside the ratio — the composition matters as much as the summary number. Two companies with identical quick ratios can be in radically different strategic positions.
(1) Growth investment triage — a company with a low quick ratio should fix retention before pouring more into acquisition; the incremental acquisition dollar leaks out. (2) Board reporting — quick ratio trend is a cleaner headline than absolute MRR growth. (3) Segment analysis — compute quick ratio by cohort, by segment, by product line to find the healthy pockets vs. the leaking ones. (4) Diligence — investors compute quick ratio from your data even if you don't report it; knowing your own number and its trajectory beats being surprised.
Early-stage SMB SaaS: 3-5 is normal, top quartile 6+. Mid-market SaaS: 4-6, top quartile 7-9. Enterprise SaaS: often lower absolute numbers (2-4) because contract sizes are lumpy and churn is more binary — one lost logo can distort the ratio. PLG products with viral loops: quick ratios above 8 during rapid land motion, moderating to 3-5 at scale. Benchmarks matter less than trajectory — a ratio moving from 2 to 4 over 6 months is a great story regardless of the absolute number.
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