Gross Retention Rate is the count-side complement to NRR. GRR = (Starting ARR - Contraction - Churn) / Starting ARR. Critically, it EXCLUDES expansion revenue, so GRR is always less than or equal to NRR. The gap between GRR and NRR (called the expansion contribution) tells you how much of NRR strength comes from upsell vs pure retention. >95% GRR is top-decile.
(Starting ARR - Contraction - Churn) / Starting ARRStarting ARR $1M - Contraction $50K - Churn $100K = $850K. GRR = $850K / $1M = 85%.
See how public B2B SaaS companies disclose this metric, with full historical time series.