NRR vs NDR: Key Differences Explained

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. The discipline that makes NRR meaningful is the cohort math. Fix the cohort at the start of the measurement period — every customer paying you on January 1 — and exclude every logo signed after that date. Twelve months later, measure what that exact set of customers pays, counting their expansions and subtracting their contractions and churn, and divide by the starting number. New-customer revenue never enters the calculation; the whole point of the metric is to isolate what happens to revenue you already won. That is also why investors quote it so heavily: NRR tells them what the business would do if sales stopped tomorrow. A company at 115% NRR compounds on its installed base with zero acquisition spend, so every new dollar of sales lands on top of a base that grows by itself. When comparing NRR vs NDR figures across companies, the label matters far less than the cohort convention, the time window, and whether the figure is dollar-weighted or a median of per-customer retention.

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. The naming split is largely historical. "Net dollar retention" spread through public-company filings and analyst coverage, where the word "dollar" usefully distinguishes the metric from logo retention — a company can retain 95% of its customers and still post 120% NDR if the survivors expand. "Net revenue retention" became the default label in private-market benchmarking and fundraising materials. Public SaaS companies typically define their exact NDR formula in the metrics section of their filings, and those definitions genuinely vary: some measure trailing-twelve-month revenue against the prior period, some annualize the current month, some exclude customers below a size threshold. So the practical rule is: never compare two companies' retention figures without reading both definitions, because the variance between two "NDR" calculations commonly exceeds the difference between anyone's NRR and NDR.

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. In diligence, expect investors to rebuild the number themselves from your billing data rather than accept the headline — so keep the cohort definition, the measurement window, and the treatment of multi-product accounts written down and consistent from deck to data room. A retention figure that moves when the auditor recalculates it does more damage than a mediocre one that holds.

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. A fuller cohort walk-through. On January 1, a SaaS company has $500K MRR from the 40 customers it will measure — that is the cohort, frozen. Over the next twelve months, within that cohort only: 12 customers expand for +$90K MRR, 6 customers downgrade for −$25K, and 5 customers churn entirely, taking −$60K with them. Ending cohort MRR = $500K + $90K − $25K − $60K = $505K. NRR (or NDR — same number) = $505K ÷ $500K = 101%. Gross revenue retention, which ignores the expansion, is ($500K − $25K − $60K) ÷ $500K = $415K ÷ $500K = 83%. Those two numbers together tell the real story: the base leaks 17% a year, and expansion from a minority of accounts is just barely papering over it. Note the trap of quoting monthly figures: a 99.9% monthly NRR sounds indistinguishable from 100% but compounds to roughly 98.8% over twelve months — always state the period.