How much recurring revenue you keep — and grow — from the customers you already have, before winning a single new one. The metric investors treat as the truest sign of a durable business.
Net revenue retention takes a cohort of existing customers and asks: a year later, is the revenue from this exact group bigger or smaller? It nets three forces together — expansion (upsells and upgrades push it up), contraction (downgrades pull it down), and churn (cancellations pull it down too). If expansion outweighs the losses, NRR climbs above 100% and the business grows even with zero new customers. That's why it's the metric investors love: a company above 100% has a base that compounds on its own, while one below 100% has to run hard on acquisition just to refill a leaking tank. NRR and NDR (net dollar retention) are the same thing under two names.
Crucially, this only counts revenue from customers who existed at the start of the period — brand-new customers are excluded, so NRR isolates the health of your existing base.
Take a cohort that started the period at €100,000 MRR. Over the period they added €15,000 in expansion, lost €3,000 to contraction (downgrades), and lost another €7,000 to churn.
At 105%, that cohort is worth more today than a year ago despite the losses — expansion more than covered the leaks. Layer new customers on top of a base like that, and overall growth accelerates.
The dividing line is 100% — below it your base shrinks, above it it grows:
| NRR | Verdict | What it means |
|---|---|---|
| 110%+ | Best-in-class | Strong expansion engine |
| > 100% | Great | You grow without new logos |
| 90–100% | Acceptable | Holding steady, modest leak |
| < 90% | Leaky | Base is shrinking; fix retention |
Remember NRR and NDR are identical metrics. The best SaaS businesses push well past 110% by building expansion — seats, usage, upgrades — into the product, so existing customers become a growth engine in their own right.
Revenue churn · Expansion revenue · Churn rate · Quick ratio
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