NRR and Expansion MRR Growth Rate both track revenue from existing customers, but they answer different questions. One measures the health of your revenue base; the other measures the velocity of growth within it. Understanding the distinction helps you use each metric where it actually belongs.
The core distinction
Net Revenue Retention Rate (NRR) is a cohort-based metric. It takes a defined group of customers, measures their revenue at the start of a period, then measures what that same group contributes at the end, accounting for upgrades, downgrades, and cancellations. The result is a percentage: above 100% means the cohort expanded net of churn; below 100% means it contracted.
Expansion MRR Growth Rate is a period-over-period metric. It measures how much new revenue existing customers added through upsells, cross-sells, and seat expansions in a given month, expressed as a percentage of total MRR (monthly recurring revenue) at the start of that period. It does not net out churn or downgrades.
That structural difference matters. NRR gives you a complete picture of revenue health. Expansion MRR Growth Rate gives you a focused view of expansion momentum, isolated from retention losses.
When to use each
Use NRR when you need to communicate the long-term health of your revenue base: investor reporting, board presentations, and strategic planning. An NRR above 110% signals that your product creates enough value for customers to spend more over time, even before counting new logo revenue. It is the metric investors use to assess whether a SaaS business can grow without constantly refilling a leaky bucket.
Use Expansion MRR Growth Rate when you need to evaluate the effectiveness of your expansion motion in near-real time. If your sales and customer success teams are running upsell campaigns or testing new pricing tiers, this metric tells you whether those efforts are gaining traction month over month. It is operational and tactical where NRR is strategic.
How they relate
These metrics are complementary, not redundant. Strong Expansion MRR Growth Rate is one of the primary drivers of high NRR, but the two can diverge. A company could show healthy expansion momentum while still posting NRR below 100% if customer churn and downgrades outpace expansion. Conversely, a company with low expansion activity might still achieve NRR above 100% if its retention is exceptional.
Tracking both together gives you a more complete diagnostic. If NRR is declining, Expansion MRR Growth Rate helps you determine whether the problem is slowing expansion, rising churn, or both. If Expansion MRR Growth Rate is strong but NRR is flat, that is a signal to investigate downgrades or cancellations in the same cohort.
