Definition
Net Dollar Retention (NDR), also called Net Revenue Retention (NRR), measures the percentage of recurring revenue retained from an existing customer cohort over a defined period, typically 12 months. The formula accounts for expansion (upsells, cross-sells, price increases), contraction (downgrades), and churn (cancellations). An NDR above 100% means your existing customers are generating more revenue than they were a year ago, even before counting new customer acquisition.
NDR is calculated as: (Starting MRR + Expansion MRR - Contraction MRR - Churned MRR) / Starting MRR. For example, if you start a quarter with $500K in MRR from a cohort, add $75K in upsells, lose $20K to downgrades, and $30K to cancellations, your NDR is ($500K + $75K - $20K - $30K) / $500K = 105%.
This metric is a strong signal to investors and boards because it reveals the underlying health of your revenue engine independent of sales and marketing spend. Companies like Twilio, Datadog, and Snowflake have consistently reported NDR above 120%, which means they could stop acquiring new customers entirely and still grow. You can explore how retention metrics connect to unit economics using the LTV/CAC Calculator.
Why It Matters for Product Managers
NDR is the clearest signal of whether your product delivers compounding value. If customers expand usage over time, your product is becoming more embedded in their workflow. If they contract or churn, something is breaking in the value chain. PMs who track NDR by segment, plan, or feature cohort can pinpoint exactly where the product succeeds and where it falls short.
For product-led growth companies, NDR is especially revealing. It separates products that grow through genuine adoption from those that rely on aggressive sales. A PLG company with 130% NDR is building a fundamentally different business than one with 95% NDR, even if their top-line revenue growth looks identical.
How to Apply It
Start by segmenting NDR across your customer base. Break it down by plan tier, company size, industry, and acquisition channel. The aggregate number hides critical patterns. You might discover that enterprise customers have 140% NDR while SMB sits at 85%, which should reshape your product investment priorities.
Build NDR into your product planning process:
- ☐ Track NDR monthly by customer segment and cohort
- ☐ Identify which features correlate with expansion behavior
- ☐ Map contraction events to product gaps or competitor wins
- ☐ Set NDR targets for each product line and review quarterly
- ☐ Use cohort analysis to compare NDR across customer vintages