What Is Net Revenue Retention?

Net revenue retention captures the full picture of what happens to existing customer revenue over time. It combines the negative effects of churn and contraction with the positive effects of expansion and upselling into a single, powerful metric.

The formula is: NRR = (Starting MRR + Expansion - Contraction - Churn) / Starting MRR x 100. NRR above 100% means the company can grow revenue even without acquiring any new customers — the installed base expands faster than it contracts.

Best-in-class B2B SaaS companies achieve NRR of 120-140%, meaning existing customers generate 20-40% more revenue each year through upsells and expansion. Enterprise-focused businesses with land-and-expand strategies often see the highest NRR. SMB-focused businesses typically achieve NRR of 90-110%.

NRR is so important because it creates a compounding growth engine. A company with 130% NRR and no new customers would still grow 30% year-over-year from existing customers alone. Layer new customer acquisition on top, and growth accelerates dramatically. This is why high-NRR companies command premium valuations.

FP&A teams should model NRR by cohort and customer segment. Understanding which customer profiles drive the highest NRR informs ideal customer profile (ICP) definition, product roadmap priorities, and customer success resource allocation.

For UK SaaS companies, NRR can be affected by pricing in GBP (no currency impact on domestic customers), the economic environment (UK businesses may contract or expand software usage based on economic conditions), and regulatory changes that increase or decrease the need for the product.