Net Dollar Retention: The Complete Guide for SaaS
What is Net Dollar Retention?
Net Dollar Retention (NDR), also called Net Revenue Retention (NRR), measures how much revenue you retain and expand from your existing customer base over a period. It's expressed as a percentage where above 100% means your existing customers are generating more revenue over time — even without acquiring a single new customer.
Formula: NDR = (Beginning ARR − Churn − Contraction + Expansion) / Beginning ARR × 100
Example: A company starts the year with $5M ARR from existing customers, loses $400K to churn and $100K to contraction, and adds $800K in expansion. NDR = ($5M − $400K − $100K + $800K) / $5M = 106%.
Also known as: Net Revenue Retention (NRR), Net Dollar Retention (NDR), Dollar-Based Net Retention (DBNR). These terms are used interchangeably in the SaaS industry.
Why Investors Obsess Over NDR
NDR is arguably the most important metric in SaaS because it measures the compounding power of your customer base. A company with 120% NDR doubles its revenue from existing customers every ~4 years with zero new sales. A company with 90% NDR loses half its revenue from existing customers in about 7 years.
This is why companies with high NDR command premium valuations. A 10-point improvement in NDR (from 110% to 120%) can translate to a 20-30% increase in valuation — often worth tens or hundreds of millions of dollars for scaled companies.
NDR Benchmarks
What "good" looks like depends on your segment and stage:
- Elite (125%+): Snowflake, Datadog, Confluent — usage-based models with strong product-led expansion
- Excellent (115-125%): CrowdStrike, Zscaler, MongoDB — strong expansion with low churn
- Good (105-115%): HubSpot, Monday.com — solid retention with moderate expansion
- Concerning (<100%): Your existing customer base is shrinking. Fix this before spending more on acquisition.
The median NDR for public SaaS companies is approximately 115%. For earlier-stage companies ($1-10M ARR), anything above 105% is solid. For a complete breakdown of how 20 public SaaS companies compare on NDR and GRR, see our 2026 SaaS retention benchmarks.
NDR vs GRR: What's the Difference?
Gross Revenue Retention (GRR) excludes expansion. It only measures how much revenue you keep, capped at 100%. GRR tells you how sticky your product is without the upside of expansion masking problems.
If your GRR is below 85%, you have a fundamental product or market fit issue that upselling won't fix. Expansion revenue can mask churn temporarily, but eventually the leaky bucket catches up.
Track both. GRR tells you the floor (how sticky is your product), NDR tells you the ceiling (how much can your customer base grow). For a deeper dive, see our complete guide to Gross Revenue Retention.
How to Improve NDR
Reduce churn: This is the highest-leverage improvement. Every dollar retained is a dollar you don't need to replace with expensive new customer acquisition. If you're not sure how to measure it consistently, see our guide on how to calculate churn rate for SaaS.
Build expansion into the product: Usage-based pricing naturally captures expansion as customers grow. Seat-based models expand as teams grow. Feature gates encourage upgrades.
Proactive customer success: Don't wait for renewal conversations. Surface expansion opportunities early and address churn risks before they become cancellations.
Track your NDR automatically with ARRGuide — upload your customer data and see your retention metrics calculated instantly. Start your free trial →