Gross revenue retention (GRR)

Like NRR but excluding expansion: it measures pure retention. GRR can never exceed 100% and is the honest measure of whether customers stay. Healthy B2B SaaS runs 80-100%.

GRR = (Starting ARR - Contraction - Churn) / Starting ARR

Compare revenue churn with logo churn to see who is leaving: revenue churn above logo churn means your larger customers are departing, below means the small ones are.