Net Revenue Retention: Growth from Your Existing Customers
NRR measures how much revenue you retain and expand from existing customers. Above 100% means you grow even without new sales.
| Model | Seed | Series A | Series B | Top quartile |
|---|---|---|---|---|
| B2B SaaS | 100-110% | 110-130% | 120-140% | 120%+ |
| Consumer | 80-95% | 85-100% | 90-105% | 95%+ |
Net Revenue Retention (NRR) measures the percentage of recurring revenue retained from existing customers over a period, including expansion, contraction, and churn. An NRR above 100% means your existing customer base is growing on its own — the holy grail of SaaS economics.
What It Is
NRR = (Starting MRR + Expansion MRR - Contraction MRR - Churned MRR) / Starting MRR x 100. Only include customers who existed at the start of the period. New customers acquired during the period are excluded.
Why It Matters
NRR is arguably the single best predictor of long-term SaaS success. A company with 130% NRR can lose 30% of its customers annually and still grow revenue from its existing base. It means your product becomes more valuable over time, customers expand usage naturally, and your growth compounds on itself. The best public SaaS companies (Snowflake, Datadog, Twilio in their prime) posted NRR above 130%.
How to Calculate It
Cohort your customers by their start date. Track the revenue from each cohort over 12 months. Divide the ending revenue by starting revenue. Be careful to separate true expansion (customers buying more seats, higher tiers, or new products) from price increases, which inflate NRR artificially.
Startup Anecdote
Slack's early NRR numbers were legendary — reportedly over 140% in their first few years. The mechanism was simple but powerful: a team would start with 5-10 people on a free plan, convert to paid as usage grew, and then expand across the entire organization. A single champion would bring in their team, that team's success would attract other departments, and suddenly a $500/month account became a $50,000/month enterprise contract. This land-and-expand motion was so effective that Slack's revenue grew even during quarters when new customer acquisition slowed.
Key Takeaway
If your NRR is below 100%, fix retention before investing in acquisition. Every new customer you acquire is pouring water into a leaky bucket. Focus on understanding why customers contract or churn, build expansion triggers into the product (usage-based pricing, team features, premium tiers), and track NRR by segment to identify where your product delivers the most compounding value.