NDR and NRR are the same metric under different names
Net Dollar Retention and Net Revenue Retention are identical in formula and meaning. The distinction is purely terminological. NDR is the preferred label in investor materials and board decks. NRR appears more often in RevOps frameworks, CRM dashboards, and customer success reporting. The risk is that teams use both terms without recognizing the overlap, which creates apparent disagreements in data that are really just naming inconsistencies.Establish one term as your internal standard and define it in your metrics glossary. When reporting to investors, use whatever term your audience expects, but anchor it to the same calculation your CS and RevOps teams use.
The NDR formula
NDR = (Starting ARR + Expansion ARR - Contraction ARR - Churned ARR) / Starting ARRApply this to a fixed cohort, usually customers who were active at the start of the measurement period. The output is a percentage.
| Component | What it includes |
|---|---|
| Starting ARR | ARR from the cohort at period open |
| Expansion ARR | Upsells, cross-sells, seat additions from that cohort |
| Contraction ARR | Downgrades or reduced seat counts |
| Churned ARR | Customers who cancelled entirely |
Why nomenclature matters across teams
Finance teams using NDR and RevOps teams using NRR will produce identical numbers, but if leadership sees two different metric names in two different decks, it creates unnecessary reconciliation work. It also creates risk in board meetings when a CFO and a CRO present the same metric with different labels and slightly different inputs, such as when one team counts contraction and the other does not.
Document the formula, the inputs, and the measurement period clearly. Reference gross revenue retention alongside NDR so stakeholders understand the difference. GRR removes expansion from the picture and shows raw retention, while NDR shows the net effect including growth from the base.
NDR as a growth lever
An NDR above 100% means the installed base compounds. Each dollar of ARR retained generates more than a dollar in the next period without acquiring a new customer. This changes how you model growth targets and allocate spend. Without a systematic expansion motion, NDR will trend toward or below your gross retention floor, regardless of how efficiently you acquire new customers. See expansion revenue for how that motion is defined and measured.
Frequently Asked Questions
Is net dollar retention the same as net revenue retention?
Yes. NDR and NRR use the same formula and measure the same thing. NDR is the term more commonly used in investor reporting and fundraising contexts, while NRR appears more often in go-to-market and RevOps discussions. Aligning on a single term internally prevents confusion when the same number is referenced differently across finance and sales.
How is NDR calculated?
Take a cohort's ARR at the start of a period. Add expansion ARR from that cohort during the period, subtract contraction ARR, and subtract churned ARR. Divide the result by the starting ARR. The outcome is expressed as a percentage. Above 100% means the cohort grew without adding new logos.
What does NDR above 100% mean for a SaaS business?
NDR above 100% means your existing customer base is expanding faster than it is churning or contracting. Revenue grows from the installed base alone. This is one of the strongest signals of product-market fit and reduces dependence on new customer acquisition to hit growth targets.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like net dollar retention (ndr) into prescriptive action for your team.
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