Quick Ratio = (New ARR + Expansion ARR) ÷ (Contraction ARR + Churned ARR)
The SaaS Quick Ratio tells you how efficiently a company is growing by measuring how much new revenue you generate for each dollar of revenue you lose. It was popularized by investor Mamoon Hamid as a way to distinguish companies growing cleanly from those growing on top of a leaky base.A ratio of 4 means for every dollar churned or contracted, you are adding four dollars of new and expansion revenue. A ratio of 1 means growth and loss are exactly offsetting. Below 1 means the company is shrinking.
The Four Inputs
| Input | Definition | Where to Find It |
|---|---|---|
| New ARR | ARR from net-new logos in the period | CRM / billing system, new-business closes |
| Expansion ARR | ARR added from existing customers (upsell, cross-sell, seat expansion) | CRM / billing, expansion bookings |
| Contraction ARR | ARR lost to downgrades or partial cancellations from existing customers | Billing system, contraction events |
| Churned ARR | ARR fully lost when a customer cancels | Billing system, churn events |
Mamoon's 4x Benchmark and How to Interpret It
Mamoon Hamid's 4x benchmark is a heuristic for high-growth venture-backed SaaS, not a universal standard. Context matters.
- A company with very low churn and high expansion can sustain a lower Quick Ratio because the base is healthy. - A company growing purely on new logos with high churn needs a higher Quick Ratio to offset the leaking base. - At early stages with a small ARR base, the ratio is volatile and less meaningful than directional trends.
Track the ratio on a rolling four-quarter basis to observe whether growth efficiency is improving or degrading as the company scales.
Building a Rolling View
Calculate Quick Ratio for each quarter using trailing data and plot the trend. Divide that view into two sub-ratios: new ARR efficiency (New ARR ÷ Churned ARR) and expansion efficiency (Expansion ARR ÷ Contraction ARR). This separates acquisition health from retention health and tells you where efficiency problems originate.
For related retention metrics, see Quick Ratio (SaaS), Net Revenue Retention, and Gross Revenue Retention.
Frequently Asked Questions
What is the SaaS Quick Ratio formula?
SaaS Quick Ratio = (New ARR + Expansion ARR) ÷ (Contraction ARR + Churned ARR). All four inputs are measured over the same period, typically a quarter. A result of 4 means you are adding four dollars of new and expansion revenue for every dollar you lose.
What is a good SaaS Quick Ratio?
Mamoon Hamid of Kleiner Perkins popularized 4x as the benchmark for a high-growth SaaS company. Below 1 means the business is contracting. Between 1 and 2 suggests modest growth offset by significant churn. Above 4 signals efficient growth with manageable revenue loss.
How does Quick Ratio differ from Net Revenue Retention?
Net Revenue Retention measures how much revenue from an existing cohort of customers grew or shrank over time, expressed as a percentage. Quick Ratio measures the efficiency of total revenue growth by comparing gross new revenue to gross lost revenue in the same period. NRR is a retention metric; Quick Ratio is a growth efficiency metric.
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