Net revenue retention (NRR) is the percentage of last year’s revenue you kept from last year’s customers, after churn, downgrades, and expansion are all counted. At 100%, your existing customers are worth exactly what they were a year ago. Below 100%, your business leaks: some of every new deal you close goes to refilling a bucket with a hole in it. Above 100%, your existing customers grow your revenue on their own, before you sign anyone new.
That is why it is the one number that shows whether growth is real. Top-line growth can come entirely from new logos papering over churn. NRR cannot be papered over. Here is the question I would ask you, the same one I ask on a discovery call: if you stopped acquiring new clients today, what would happen to your revenue over the next 12 months? If you cannot answer that with a number, this page is for you.
One scoping note before the math. NRR is built for businesses with recurring or repeat revenue: agencies and MSPs on retainers, SaaS, subscription services, membership businesses. If your revenue is entirely one-off projects, track repeat purchase rate instead; the logic transfers, the formula does not.
The net revenue retention formula
Take a cohort of customers from 12 months ago and compare their revenue then and now:
NRR = (current monthly recurring revenue from the customers you had 12 months ago) ÷ (their monthly recurring revenue 12 months ago)
Only customers who existed at the start of the window count. New customers signed since then are excluded, which is the entire point: the metric isolates what your existing base did. Expansion, upsells, cross-sells, and price increases push the numerator up. Churn and downgrades pull it down.
Suppose, as an illustration, an agency had $400,000 in monthly retainers a year ago. Since then, two clients worth a combined $30,000 a month left, one downgraded by $10,000, and expansions across the rest added $25,000. Those same clients now bill $385,000 a month. NRR is 385 ÷ 400, or 96%. The agency gave back 4% of its base before a single new deal counted toward growth. If it grew top-line revenue 15% that year, roughly a fifth of its new business went to refilling the bucket.
You can run this on your own numbers in a spreadsheet in ten minutes. Pull the client list from 12 months ago, their billing then, their billing now, and divide.
Gross revenue retention, the honest floor
Gross revenue retention (GRR) is the same formula with expansion stripped out: for the calculation, no customer counts for more than they were worth a year ago. It can never exceed 100%. GRR answers a colder question: how much revenue do you keep when nobody upgrades?
The two numbers matter together. A business at 105% NRR and 70% GRR is not healthy, it is churning heavily and masking the loss with big expansions from a few accounts, which is concentration risk wearing a growth costume. A business at 98% NRR and 95% GRR has a much sturdier base and one solvable problem. Track both, decompose the gap into its drivers (churn, downgrades, expansion), and assign each driver an owner. That decomposition, not the calculation itself, is where the operating leverage is.
What a good number looks like
The best available benchmark data for private companies comes from SaaS Capital’s annual survey of private B2B businesses. In their 2025 study, companies with annual contract values between $25,000 and $50,000 showed a median NRR of 102%, with the top quartile at 111% and the bottom quartile at 97%. Retention correlates with contract size: the bigger the annual contract, the higher the typical NRR. And the growth connection is direct: across their sample, companies with NRR of at least 110% grew faster than the 24% median growth rate, and companies below 100% grew slower (SaaS Capital, 2025 retention benchmarks).
Those benchmarks are drawn from SaaS companies, so read them as directional if you run an agency or MSP on retainers. The working thresholds I use: below 95%, retention is the growth problem, fix it before spending another dollar on acquisition. Between 95% and 105%, you are normal and have room to compound. Above 105%, your existing base is a growth engine and your acquisition spend is pure offense.
Where NRR sits in revenue operations maturity
In the Revenue Operations Maturity Model, NRR management is a Stage 3 competency, which tells you something in itself: most founder-led businesses are not there yet, and that is normal. The progression looks like this. At the bottom, NRR is simply not calculated; existing-customer revenue is not even separated from new-logo revenue in reporting. The first real step is calculating it monthly and decomposing it into its drivers, each with an owner. Mature businesses treat it as a primary metric with improvement targets per driver. And at the top, NRR exceeds 100% and the customer base grows revenue year over year without a single new logo. You do not need the top today. You need to know your number and which driver is dragging it.
This is also a place where the fundamentals-first rule applies to AI and tooling. Churn-prediction software applied to a business that cannot yet compute its own NRR from clean billing data automates guesswork. Get the number, the decomposition, and the owners first. The maturity model overview shows where that foundation starts.