What is Net Dollar Retention (NDR)?
Net dollar retention measures the percentage of recurring revenue retained from existing customers over a period, including expansion, contraction, and churn. NDR above 100% means your installed base is growing without any new customers.
Net dollar retention (also called net revenue retention or NRR) is the single most important metric for SaaS valuation. It tells investors whether your existing customer base is growing or shrinking. A company with 120% NDR generates 20% revenue growth from existing customers alone, before any new sales. This is why high-NDR companies command premium valuation multiples.
NDR Formula
NDR = (Beginning Period ARR + Expansion - Contraction - Churn) / Beginning Period ARR x 100. Example: Start the year with $10M ARR from a cohort. During the year, that cohort generates $2M in expansion, $500K in contraction, and $800K in churn. NDR = ($10M + $2M - $0.5M - $0.8M) / $10M = 107%. This means the cohort is worth 7% more at year-end than at year-start, with zero new customers added.
Benchmark Ranges
Below 90%: The customer base is shrinking. Serious retention problem. Sustainable growth is nearly impossible without unsustainable new customer acquisition. 90-100%: Revenue stable but not growing from existing customers. All growth must come from new logos, which is expensive. 100-110%: Healthy. Existing customers are growing modestly. 110-130%: Strong. This is where most successful SaaS companies operate. The installed base drives meaningful growth. Above 130%: Exceptional. Companies like Snowflake and Datadog have demonstrated 130%+ NDR driven by usage-based pricing and product-led expansion.
NDR vs GDR
NDR includes expansion revenue. Gross dollar retention (GDR) excludes it, measuring only the impact of churn and contraction. A company with 120% NDR might have 90% GDR, meaning it loses 10% of revenue to churn and contraction but more than makes up for it with 30% expansion. Both metrics matter. GDR shows retention health. NDR shows economic health. A company with 85% GDR and 115% NDR is masking a leaky bucket with strong expansion. Fix the retention problem and NDR could be 130%+.
Why This Is the Top Valuation Driver
Public SaaS companies with 120%+ NDR trade at significantly higher revenue multiples than those with sub-100% NDR. The reason is simple math: high NDR creates compounding revenue growth from the installed base. A company adding 30% new logo growth with 120% NDR compounds much faster than a company adding 30% new logo growth with 95% NDR. Over 5 years, the difference in total revenue is dramatic. Every CRO should know their company's NDR and have a plan to improve it.
Common Mistakes
Reporting NDR on a quarterly basis without annualizing. A single quarter can be misleading due to large renewals or seasonal patterns. Always report trailing-12-month NDR for an accurate picture. Another mistake: including one-time revenue in the NDR calculation. NDR should only measure recurring revenue. Including professional services or one-time fees inflates the number and creates a misleading comparison with peers.
In Practice
Track NDR by customer segment (enterprise, mid-market, SMB), by cohort (customers acquired in Q1 2024, Q2 2024, etc.), and by product line. Segment-level NDR reveals where expansion is working and where churn is concentrated. Cohort analysis shows whether newer customers retain better or worse than older ones, signaling product-market fit changes. Present NDR trends in every board meeting alongside the waterfall decomposition (starting ARR, expansion, contraction, churn, ending ARR) so the board can see what's driving the number.
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