NRR answers what happened to the customers you already had
Start with recurring revenue from a defined customer cohort at the beginning of the period. Then reflect churn, contraction, and expansion from those same customers. New customers are excluded from the core calculation.
That makes NRR a retention and expansion measure rather than a total growth rate.
Keep the cohort fixed
Adding new customers into the denominator or numerator can hide weakness in the original base. Define whether the measurement is monthly, quarterly, or annual and keep the cohort rules consistent.
Document treatment for acquisitions, divestitures, currency changes, and customer merges.
Tie the result to the ARR or MRR roll-forward
Expansion, contraction, and churn used in NRR should come from the same recurring revenue schedule management relies on elsewhere. If NRR requires a separate spreadsheet with different customer values, reconcile the difference.
A consistent source reduces metric debates at board meetings.
Use segmentation to understand the business model
NRR can differ sharply between small business, mid-market, and enterprise customers or between products. Compare segments only when the definitions and periods are consistent.
The metric becomes useful when it changes retention, pricing, product, or customer-success decisions.
Questions buyers usually ask
Does net revenue retention include new customers?
The standard concept focuses on the starting customer cohort, so new-customer revenue is generally excluded from the calculation.
Can NRR be above 100 percent?
Yes. Expansion from existing customers can exceed churn and contraction, producing net retention above the starting recurring revenue base.
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