Gross retention (GRR) measures how much recurring revenue you keep; net retention (NRR) measures how much the same base is worth after expansion. GRR excludes upsell and can never exceed 100%. NRR includes it and can exceed 100%. Run both on the same period and the gap between them tells you whether growth is built on a stable base—or on a handful of expanding accounts covering avoidable losses.
Both formulas, one example
Gross retention vs net retention — same quarter
GRR = (1,000,000 − 120,000) ÷ 1,000,000 = 88%. NRR = (1,000,000 − 120,000 + 150,000) ÷ 1,000,000 = 103%. Growth looks healthy, but 12% of the base was lost.
Illustrative quarter, $1,000,000 starting ARR:
- Gross revenue retention = (1,000,000 − 80,000 churn − 40,000 downgrades) ÷ 1,000,000 = 88%
- Net revenue retention = (1,000,000 − 80,000 − 40,000 + 150,000 expansion) ÷ 1,000,000 = 103%
Same quarter, same customers, two conclusions. NRR above 100% looks like a growing base. GRR at 88% says 12% of the revenue you started with is gone.
What each number includes
| Gross retention (GRR) | Net retention (NRR) | |
|---|---|---|
| Churn | Included | Included |
| Downgrades | Included | Included |
| Expansion / upsell | Excluded | Included |
| New customers | Excluded | Excluded |
| Maximum value | 100% | No ceiling |
| Question answered | Do we keep what we sold? | Does the installed base grow? |
| Primary owner | Customer Success and Support | Customer Success and Account Management |
One rule is easy to get wrong: new customers never belong in either formula. Both measure a fixed cohort of existing revenue from the start of the period. Adding new business turns a retention metric into a growth metric and hides everything useful.
The gap is the metric
The 15-point gap between NRR and GRR
A wide gap means growth depends on a few expanding accounts rather than a stable base.
A 15-point gap between NRR and GRR, as in the example above, is a specific diagnosis: expansion is doing the work that retention should be doing. Three readings worth knowing:
- Narrow gap, high GRR — a stable base with modest growth. Healthy and predictable.
- Wide gap, low GRR — growth concentrated in a few accounts while the base leaks. Fragile: one large account slowing down erases the headline number.
- NRR below 100% with strong GRR — you keep customers but they are not growing. That is a product value and account-management question, not a churn question.
Track the gap quarterly. It moves before the headline number does.
Turning the numbers into decisions
From retention signal to owner
Each component maps to a different team, which is why a single blended figure never drives change:
- Downgrades usually mean value was realized in only part of the account—an adoption and enablement problem. Owner: Customer Success, with a milestone plan.
- Full churn is almost always visible 60 to 90 days earlier through usage decline, unresolved escalations or a lost sponsor. A structured customer health score model surfaces that signal before renewal.
- Expansion should be a documented motion, not an accident: identified needs, timed to value delivery, prepared through a quarterly business review.
- At-risk ARR deserves its own review cadence at leadership level, with an owner and a date per account.
Common mistakes
- Reporting NRR alone. The most frequent mistake, and the one that lets retention problems stay invisible for quarters.
- Mixing new business into the cohort, which inflates both numbers.
- Changing the period or the definition between reports, so the trend cannot be compared.
- Blending segments. Enterprise, mid-market and self-serve retain very differently; a blended figure hides both the problem and the success.
- Measuring annually only. Quarterly cohorts let you act while the renewal is still open.
Which one should you report?
Report both, always, side by side, with the gap stated explicitly. If you must lead with one for an internal operating review, lead with GRR: it is the number your team can directly influence through onboarding, adoption, support quality and risk management. Use NRR to describe the commercial outcome of that work.
For planning, the pair is more useful than either alone. GRR sets the floor—what you can count on without selling anything new. NRR sets the trajectory. And churn, the inverse view of GRR, is where the diagnosis lives: see the churn rate formula for how to break the losses down by reason.
Frequently asked questions
Can gross retention exceed 100%? No. It excludes expansion, so 100% means you lost nothing.
Is net retention the same as negative churn? Effectively yes—NRR above 100% describes a base where expansion outweighs losses.
How often should we calculate them? Quarterly for operating reviews, with an annual view for planning, using an identical definition every time.
Who should own these metrics? Customer Success owns GRR, Customer Success and Account Management share NRR, and the CSM scorecard should carry both—see customer success manager KPIs.
Practical takeaways
- GRR = (starting ARR − churn − downgrades) ÷ starting ARR; it excludes expansion and cannot exceed 100%.
- NRR adds expansion to the same cohort, so it can exceed 100% while retention is weak.
- Never include new customers in either formula—both measure a fixed starting cohort.
- The gap between NRR and GRR is the real signal: a wide gap means growth depends on a few expanding accounts.
- Report both side by side, segmented, with an identical definition every quarter.