CS protects and expands the base, so I lead with NRR and GRR, the numbers a board actually watches. NPS as the headline CS metric is the tell that a team is measuring sentiment instead of retained dollars.
Shape of it
7 metrics
Revenue retained plus expansion from existing customers, net of churn and contraction.
(start ARR + expansion − contraction − churn) / start ARRBenchmarkMedian 102%, top quartile 110%, bottom quartile 92% (Aleph × Benchmarkit FY2025). Usage-based pricing runs 108% vs 98% for seat-based. 110%+ is strong, not the median
The single most important efficiency metric in modern SaaS; growth without new logos.
Revenue retained before any expansion.
(start ARR − contraction − churn) / start ARRBenchmarkMedian 84% (Aleph × Benchmarkit FY2025); higher for ACV over $100K, SMB books lower. Caps at 100%
Isolates leakage; NRR can hide churn that expansion masks.
Share of customers lost in a period.
customers lost / customers at startBenchmark<5–7% annual for enterprise; higher for SMB
Counts relationships, not just dollars; early signal of product-market fit issues.
Revenue lost to churn and contraction.
(churn + contraction − expansion) / start ARR for netThe dollar view that pairs with logo churn.
Composite score predicting renewal likelihood from usage, engagement, support.
A leading indicator that lets CS act before a renewal is at risk.
Share of revenue growth from existing customers (upsell/cross-sell).
BenchmarkExpansion costs ~$0.80 per $1 of ARR vs ~$1.63 to acquire (Aleph × Benchmarkit FY2025); ~52% of new revenue now comes from the base (gradient.works 2025)
The lever behind NRR above 100%, and the cheapest dollar you can add.
Time for a new customer to reach a first value milestone.
Slow onboarding predicts early churn; a core CS operating metric.