Net Revenue Retention (NRR) measures what you keep plus what you expand from existing customers. Gross Revenue Retention (GRR) measures only what you keep — expansions excluded. The gap between them is your expansion efficiency, and it tells a specific story about your business model.
A company with 115% NRR and 85% GRR has a 30-point expansion spread. This means they're losing 15% of base revenue to churn and contraction, but recovering that and more through expansion. The business is growing from the existing base, which is capital-efficient. But the 15% gross churn is a real problem — it means the expansion is masking underlying retention issues.
A company with 95% NRR and 93% GRR has a 2-point expansion spread. They keep almost everything (93% GRR is excellent) but they're not growing their existing accounts. This is a churn-resistant business with an expansion problem. Product is working; upsell motion isn't.
A company with 80% NRR and 65% GRR has a 15-point expansion spread on top of terrible gross retention. Expansion is compensating somewhat for significant churn, but not enough. This is a retention emergency that expansion programs can't fix.
Each of these profiles requires completely different interventions:
High churn + high expansion: fix retention before scaling expansion. The expansion motion is a band-aid on a wound.
Low churn + low expansion: build expansion motion. Product-led expansion triggers, CSM expansion training, pricing tiers designed to grow with customer success.
High churn + low expansion: full retention audit. ICP problem, onboarding problem, or product-market fit problem — investigate urgently.
Know your GRR. Know your NRR. Interrogate the gap.