Net revenue retention: why 100% is the line that matters
Of all the metrics a subscription business tracks, net revenue retention is the one investors scrutinise hardest — because it reveals whether the business grows even if it never signs another customer.
Skip the math — the free net revenue retention calculator runs this from your own figures.
Open the free calculator →What net revenue retention measures
Net revenue retention takes a group of existing customers and asks what happened to their recurring revenue over a period. You start with their revenue at the beginning, add any expansion from upgrades or added seats, subtract contraction and churn, and divide by where they started. Crucially, it excludes revenue from brand-new customers — it isolates how the base you already have behaves, without new sales flattering the picture.
That isolation is the point. A business can mask weak retention by pouring new customers into the top of the funnel, but net revenue retention strips that away and shows the underlying health of the customers you've already won. It answers a question new-customer growth never can: is the product becoming more valuable to the people using it?
Why 100% is such an important line
When net revenue retention is above 100%, expansion from your existing customers more than offsets everything you lose to churn and contraction. That means your revenue grows even with zero new customers — the base compounds on its own. Below 100%, the base shrinks, and you have to keep acquiring just to stand still, with new sales filling a leaking bucket.
This is why crossing 100% changes the character of a business. Above the line, every new customer adds to a base that's already growing, so growth compounds. Below it, growth is a treadmill. The best subscription businesses run net revenue retention comfortably above 100%, which is what lets them grow efficiently without ever-increasing acquisition spend.
Net versus gross retention
Gross revenue retention counts only what you lost — contraction and churn — and can never exceed 100%. It measures how leaky the bucket is. Net revenue retention also credits expansion, so it can rise above 100% when upgrades outweigh losses. Reading them together matters: a strong net number propped up by a handful of big expansions can hide weak gross retention underneath, where most customers are quietly leaving.
A healthy picture usually pairs solid gross retention — few customers leaving — with expansion on top. If your net number looks good but gross retention is poor, you're relying on a few accounts growing fast to cover widespread churn, which is fragile. Tracking both, by cohort, shows whether retention is broad-based or concentrated.
Tracking it by cohort over time
Net revenue retention is most useful measured cohort by cohort — grouping customers by when they joined — and watched over time. A single blended number can drift for reasons that have nothing to do with product value, like a change in customer mix. Cohorts hold that constant, so you can see whether newer customers retain and expand better or worse than older ones, and whether changes you've made are moving the needle.
The free calculator gives you net and gross retention for a cohort from its starting, expansion, and churned revenue, and the full tracker holds multiple cohorts so you can watch the trend. It's assumptions-driven and not financial advice, but it turns one of the most important SaaS metrics into a number you can monitor deliberately rather than estimate.
Questions
What's a good net revenue retention rate?
Above 100% is the key threshold, because it means your existing base grows on its own. Strong subscription businesses often run comfortably above it, with the best posting well into the hundreds, though what's achievable depends heavily on the model — businesses that can sell more seats or usage to existing customers have an easier path to high NRR than those selling a flat single-seat product. Rather than chase a benchmark from a different model, track your own NRR by cohort and watch whether it's rising or falling.
Does net revenue retention include new customers?
No — and that's what makes it powerful. Net revenue retention deliberately excludes revenue from brand-new customers, measuring only what happens to a group that already existed at the start of the period. Including new customers would blur the picture, because heavy new-customer acquisition could hide the fact that your existing base is shrinking. By excluding them, NRR isolates the health of the customers you've already won and shows whether the product delivers growing value over time.