What is net revenue retention?
Net revenue retention measures how much recurring revenue a business keeps from its existing customer base over a period — typically a year — after accounting for churn and downgrades, but including upsell and expansion. It answers a single question: if the company signed no new customers at all, would its revenue from the existing base grow or shrink?
The metric is expressed as a percentage. Above 100% means the existing base grew on its own — expansion more than offset losses. Below 100% means the base shrank. For recurring-revenue businesses, especially software, NRR above 100% is one of the strongest signals of product value and pricing power, because customers are not just staying but spending more.
NRR matters to sponsors because it isolates the durability of the revenue they are buying. A business can post strong top-line growth while quietly leaking its existing base — NRR reveals whether growth is healthy compounding or just expensive customer acquisition papering over churn.
How net revenue retention is calculated
NRR is measured on a fixed cohort of existing customers, comparing what they pay at the end of a period to what they paid at the start.
- Fix the cohort. Take the recurring revenue from the set of customers who existed at the start of the period — this is the starting base.
- Add expansion. Add the increase in revenue from that same base over the period — upsells, cross-sells, seat or usage growth, price increases.
- Subtract contraction and churn. Subtract revenue lost to downgrades and to customers who left.
- Divide. Express the ending revenue from that original cohort as a percentage of its starting revenue. Crucially, revenue from brand-new customers is excluded.
The key discipline is that NRR follows only the original cohort. Including new customers would conflate retention with acquisition and defeat the purpose of the metric.
Net vs. gross retention
The pair are read together. Gross retention measures only what is kept — it subtracts churn and downgrades but ignores expansion, so it is capped at 100%. It tells you how leaky the base is. Net revenue retention adds expansion back in, so it can exceed 100% and tells you whether the base grows net of all movement.
The gap between them is informative. High NRR with low gross retention means a business is masking heavy churn with aggressive expansion among the customers who stay — a fragile pattern. High NRR with high gross retention is the strong case: customers rarely leave and the ones who stay spend more. Sponsors look at both precisely to avoid being fooled by a single headline number.