SaaS Quick Ratio

Why it matters

The quick ratio measures growth efficiency: a ratio of 4 means you add $4 of MRR for every $1 you lose. The common benchmark is 4 or higher is healthy, 2 to 4 is workable, and under 2 is a leaky bucket where growth stalls the moment acquisition slows. It also tells you where to spend your week: a low ratio with strong new MRR is a retention problem, not a marketing problem, and more ad spend will not fix it. At early stage the ratio swings wildly because the denominator is tiny, so compute it over a rolling quarter rather than a single month. Investors read it as a proxy for how durable your growth is once the launch spikes fade.

Formula

SaaS quick ratio = (new MRR + expansion MRR) / (churned MRR + contraction MRR)

Worked example

In June you add $4,000 in new MRR and $1,000 in expansion MRR, while losing $900 to cancellations and $350 to downgrades. Quick ratio = (4,000 + 1,000) / (900 + 350) = 4.0, which is healthy. If churn doubled to $1,800, the ratio drops to 2.3 and you have a retention problem to fix before scaling spend.

Common mistakes

• Computing it on a single month at low volume; one churned $500 account can halve the ratio. Use a rolling 3-month window.
• Ignoring the mix: a ratio propped up by heavy new MRR can hide bad retention that gets very expensive at scale.
• Treating 4 as a universal bar; enterprise SaaS on annual contracts naturally posts higher ratios than SMB monthly plans, so compare within your motion.

Related terms

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