Net Revenue Retention (NRR)

Net Revenue Retention (NRR), also called Net Dollar Retention (NDR), measures how a fixed cohort of existing customers' revenue changes over a period — typically a year — including expansion (upgrades, added seats), contraction (downgrades), and churn (cancellations), while deliberately excluding any revenue from customers acquired new during that period. The formula: NRR = (Starting ARR + Expansion − Contraction − Churn) / Starting ARR × 100. Because it strips out new-customer growth entirely, NRR answers a purer question than overall revenue growth: are the customers we already have becoming more or less valuable over time? A business can have flat or even shrinking new-customer acquisition and still grow overall revenue if NRR is comfortably above 100% — expansion from existing accounts alone drives growth, a dynamic public SaaS companies prize because it means the business compounds even if sales/marketing spend is cut. NRR above 100% is considered healthy, 110–120%+ is considered excellent and is common among best-in-class usage-based and seat-expanding B2B SaaS companies (Snowflake, Datadog have historically posted NRR well above 120%), while NRR below 100% signals that expansion and retention aren't offsetting churn and contraction, a structural problem no amount of new-customer acquisition can fix long-term since it means the "bucket" is leaking faster than it's being topped up from within. NRR is one of the first metrics public-market and late-stage investors interrogate in SaaS diligence precisely because it isolates product-market fit and expansion motion from the noise (and cost) of new logo acquisition. Concrete worked example: a SaaS company starts the year with $10M ARR from its existing customer base. Over the year, that same cohort adds $2.5M in expansion ARR (upgrades and added seats), loses $0.5M to contraction (downgrades), and loses $1M to churn (cancellations) — entirely excluding any of the $4M in ARR added from brand-new customers signed during the year. NRR = ($10M + $2.5M − $0.5M − $1M) / $10M = 110%. Reported alongside 40% overall ARR growth ($14M ending ARR), this tells investors the growth is durable — not just a function of an aggressive new-sales push papering over a leaky existing base. NRR above 100% is only achievable when expansion revenue outpaces both contraction and churn combined, which is precisely why usage-based and seat-expanding pricing models tend to post structurally higher NRR than flat-fee products — a usage-based customer who simply grows their own business automatically expands their bill without any renegotiation, while a flat-fee customer's spend never grows unless a salesperson actively upsells them to a higher tier.