Comparison
NRR vs NDR: Key Differences Explained
NRR (Net Revenue Retention) and NDR (Net Dollar Retention) are effectively the same metric with different names — both measure how much revenue a cohort of customers generates over time, including expansion and churn. NRR is the more common term among SaaS investors; NDR is sometimes used to clarify that the metric counts revenue dollars, not just accounts. If you see both terms, assume they're identical unless a company specifies otherwise.
What is NRR?
Net Revenue Retention (NRR) measures what percentage of starting-period revenue a company retains from an existing customer cohort, including upsells, cross-sells, and expansions, minus downgrades and churn. Formula: (Starting MRR + Expansion – Contraction – Churn) ÷ Starting MRR × 100. An NRR above 100% means the company grows revenue from existing customers without adding any new ones — the business can theoretically grow to infinity on its existing base alone. Best-in-class enterprise SaaS companies like Snowflake and Twilio have reported NRR above 130%. NRR is one of the most important metrics investors evaluate because it reflects product-market fit, customer satisfaction, and the underlying health of the revenue model.
What is NDR?
Net Dollar Retention (NDR) is a functionally identical metric — the same formula, the same interpretation, just a different name. Some companies use NDR to emphasize that the metric measures dollar retention (not logo retention), clarifying they're tracking revenue expansion, not just customer headcount. Gross Revenue Retention (GRR) and Gross Dollar Retention (GDR) are the downside-only version — excluding expansion. The naming difference between NRR and NDR reflects the lack of standardization in SaaS metrics terminology. Investors who ask for NRR and NDR from the same company expect the same number. When in doubt, ask the company which specific formula they're using.
Key Differences
| Feature | NRR | NDR |
|---|---|---|
| Are they different? | No — same metric, different name | No — same metric, different name |
| Common usage | Most VCs and SaaS benchmarks | Some CFOs, data-oriented companies |
| Formula | (Start + Expansion – Churn – Contraction) ÷ Start | Same |
| Includes expansion | Yes | Yes |
| Benchmark >100% | Strong indicator of product-market fit | Same |
| vs GRR | NRR includes expansion; GRR doesn't | Same |
When Founders Choose NRR
- →When reporting metrics to VCs who ask for NRR
- →In your pitch deck and investor materials
- →When benchmarking against SaaS industry reports (Bessemer, a16z)
When Founders Choose NDR
- →When your finance team uses NDR internally
- →In financial reporting where 'dollar retention' clarity is preferred
- →Some companies use NDR to distinguish from net logo retention
Example Scenario
A B2B SaaS company starts the year with $1M MRR from 50 customers. During the year: $200K MRR from expansions (upsells, seat adds), $50K from downgrades, $100K from churned accounts. NRR = ($1M + $200K – $50K – $100K) ÷ $1M = 105%. The company would report 105% NRR — or 105% NDR if that's their terminology. Either way, the message is the same: existing customers are worth more at year-end than at year-start, and the business grows without new customer acquisition.
Common Mistakes
- 1Calculating NRR/NDR on a monthly rather than annual basis without clarifying the time period
- 2Confusing net retention (NRR) with gross retention (GRR) — GRR excludes expansion and is always lower
- 3Mixing logo retention (percentage of customers retained) with revenue retention (dollar-based)
- 4Reporting NRR on too short a time horizon — one quarter of good retention doesn't prove the model
Which Matters More for Early-Stage Startups?
NRR/NDR is one of the single most important metrics for any SaaS investor. A company with 120%+ NRR has product-market fit, strong customer satisfaction, and compounding revenue without proportional CAC spend. Track one consistently — NRR is the more universally understood label — and improve the underlying metric: lower churn and expand existing accounts.