Unit Economics
Net Revenue Retention (NRR)
Net Revenue Retention (NRR) is the percentage of recurring revenue you keep from a cohort of existing customers over a period (usually a year), after accounting for expansion (upgrades, seats, usage) and losses (churn and downgrades), excluding any new logos. It measures whether your existing customer base grows or shrinks on its own.
Also known as: NRR, Net Dollar Retention, NDR
Why it matters
NRR is the single clearest signal that you have something people keep paying for, not just something they try once. Above 100% means your existing customers spend more over time, so revenue grows even if you stop acquiring entirely, which is the closest thing to proof of durable product-market fit in a subscription business. Below 100% means you have a leaky bucket, and every dollar of acquisition spend is partly refilling losses instead of compounding, which is a build-or-kill warning. Investors weight NRR heavily because it separates a real expanding business from one that just markets well. For a founder deciding what to build next, NRR tells you whether to pour effort into expansion mechanics (upsell, seats, usage) or to stop and fix retention first. The trap is chasing top-of-funnel growth while NRR sits at 85%, which feels like progress but is just running faster on a treadmill.
Formula
NRR = (starting MRR + expansion - downgrades - churn) / starting MRR, measured for the same cohort over the period (new customers excluded)
Worked example
Start the year with a cohort doing $100k MRR. Over twelve months that same group adds $25k from upgrades and extra seats, loses $8k to downgrades, and loses $12k from customers who cancel. Ending MRR for the cohort is $100k + $25k - $8k - $12k = $105k, so NRR = $105k / $100k = 105%. The cohort grew 5% without a single new customer, which means expansion is outrunning churn.
Common mistakes
- Including new customers in the calculation. NRR is about the existing base only. If you mix in new logos you are measuring total growth, not retention, and you will fool yourself into thinking churn is fine.
- Reporting a healthy blended NRR that hides a broken segment. A few big accounts expanding can mask brutal churn among small customers. Always cut NRR by segment, plan, and cohort before you trust it.
- Good looks like 100%+ for SMB-focused SaaS and 110% to 130%+ for products with strong usage- or seat-based expansion. Below 90% means fix retention before you spend another dollar on acquisition.
Frequently asked questions
What is a good Net Revenue Retention (NRR)?
For SMB-focused SaaS, anything at or above 100% is healthy, and best-in-class products with strong expansion hit 110% to 130% or more. Enterprise tools with seat and usage expansion often run highest. Below 90% is a red flag that churn is eating your growth, and you should fix retention before scaling acquisition.
What is the difference between Net Revenue Retention and Gross Revenue Retention?
Gross Revenue Retention (GRR) counts only losses (churn and downgrades) and caps out at 100%, so it shows how leaky your bucket is at worst. NRR adds expansion back in and can exceed 100%, showing whether your base grows on its own. GRR tells you how much you keep; NRR tells you how much you grow. Watching both reveals if a strong NRR is just a few accounts masking heavy churn underneath.
How do you calculate Net Revenue Retention (NRR)?
Take a cohort's starting recurring revenue, add expansion from upgrades, seats, and usage, then subtract downgrades and churn, and divide by the starting revenue. Crucially, exclude any revenue from brand-new customers. Most teams measure it over twelve months on MRR or ARR, and the period must be consistent so cohorts are comparable.
Why can NRR be over 100%?
Because existing customers can spend more than they did before through upgrades, added seats, or higher usage. When that expansion outweighs the revenue lost to churn and downgrades, the cohort ends the period larger than it started, pushing NRR above 100%. This is the holy grail: revenue compounds from your installed base even if you stop acquiring new customers.
Does NRR matter for early-stage startups before product-market fit?
Yes, but read it carefully with small numbers. With only a handful of customers, one churn or one big upgrade swings the metric wildly, so do not over-index on a single month. What matters early is the direction and the why: are the customers who stay expanding because the product gets more useful, or are they all quietly downgrading? That signal is an honest read on whether you have problem-solution fit.
How is NRR different from churn rate?
Churn rate measures only what you lose, either in customers (logo churn) or revenue (revenue churn). NRR nets your losses against expansion from the customers who stay, so it is a fuller picture of how the existing base moves. You can have meaningful churn and still post NRR above 100% if your remaining customers expand fast enough. Track both, because NRR can hide a churn problem that will bite you once expansion slows.
Related terms
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Last updated 2026-06-09 · Back to the glossary