SaaS Quick Ratio
New plus expansion revenue divided by contraction plus churned revenue — how much growth is produced per unit of loss.
What it isolates
Two companies can add identical net new revenue while one is growing efficiently and the other is running hard to replace losses. The quick ratio exposes that difference in a single number.
Read it with NRR
How to compute and read it
Add new and expansion revenue for the period; divide by contraction plus churned revenue for the same period.
Use the same revenue basis on both sides — MRR or ARR — and the same cohort rules, or the ratio compares different populations.
Compute over several periods. A single period containing one large win or loss swings it substantially.
Read it alongside absolute growth. A high ratio on tiny numbers describes a small business, not an efficient one.
Decompose when it moves: a falling ratio caused by rising churn and one caused by slowing acquisition need opposite responses.
Where it misleads
A high ratio is achievable with very little growth if losses are near zero, so it rewards stability as much as momentum.
It says nothing about the cost of acquiring the new revenue in the numerator.
Expansion-heavy numerators make it look strong while new-logo acquisition is failing.
At small revenue the denominator can approach zero, producing enormous ratios that mean nothing.
RELATED TERMS
Churn
Customers or revenue lost over a period. The leak determining whether acquisition compounds or merely replaces.
Churn Rate
The proportion of customers or revenue lost over a period, expressed as a percentage of the starting base.
Contraction MRR
Recurring revenue lost from customers who stayed but reduced spend — fewer seats, a lower tier, a renegotiated rate.
Expansion Revenue
Additional recurring revenue from existing customers: more seats, higher tiers, additional products or increased usage.
Magic Number
A sales efficiency measure comparing new recurring revenue produced to the sales and marketing spend that produced it.
Net New ARR
The change in ARR over a period: new plus expansion minus contraction minus churn. The headline growth number.
Net Revenue Retention (NRR)
Revenue retained from an existing cohort over a period including expansion, expressed as a percentage of where that cohort started. The clearest single indicator of whether the base grows without new customers.
COMMON QUESTIONS
- What is the SaaS quick ratio?
- New plus expansion revenue divided by contraction plus churned revenue for the same period. It expresses how much revenue you are adding for every unit you are losing, which is a question neither growth rate nor churn rate answers on its own.
- What is a good SaaS quick ratio?
- Above 1 means you are adding more than you lose, which is the structural threshold that matters. The commonly quoted target of 4 is an operating convention rather than a measured optimum, and it is far less informative than your own trend across several periods.
- How is it different from net revenue retention?
- NRR looks only at an existing cohort and excludes new customers entirely. The quick ratio includes new business in the numerator, so it blends acquisition and retention into one figure. That makes it a broader health indicator and a poorer diagnostic — read both.
- What are the quick ratio's blind spots?
- Cost and scale. It ignores what the new revenue cost to acquire, so an inefficient business can post a strong ratio. And because the denominator can be very small at low revenue, early-stage companies produce enormous ratios that describe nothing durable.
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