Net Revenue Retention measures the percentage of recurring revenue you keep from a starting cohort of customers, after expansion, contraction, and churn. The standard formula is (Starting ARR + Expansion - Contraction - Churn) / Starting ARR. NRR > 100% means existing customers grew their spend on average; NRR < 100% means the existing base shrank. Top-quartile public B2B SaaS posts NRR above 120%; the median sits around 105-110%.
(Starting ARR + Expansion - Contraction - Churn) / Starting ARRStarting ARR $1M + Expansion $200K - Contraction $50K - Churn $100K = $1.05M. NRR = $1.05M / $1M = 105%.
Deep dive: /nrr/
See how public B2B SaaS companies disclose this metric, with full historical time series.