Retention metric
NRR (Net Revenue Retention)
NRR tracks one cohort's revenue change over a defined period (typically 12 months). NRR above 100% means existing customers grow revenue faster than they leave. World-class SaaS hits 130%+ NRR; healthy SaaS is 100%+; below 100% means the business is losing more from existing customers than it gains.
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Formula
NRR = (starting MRR of cohort + expansion - downgrades - churn) / starting MRR of cohort
Where:
- starting MRR of cohort = Total MRR from a defined customer cohort at start of period.
- expansion = MRR added from upgrades, seat additions, or plan moves within the cohort.
- downgrades = MRR lost from plan downgrades within the cohort.
- churn = MRR lost from cancellations within the cohort.
Worked example
A cohort of 100 customers started Q1 at $4,221 MRR. By Q4 they have: $4,000 from remaining customers (5 churned, $221 lost) + $500 in expansion from upgrades. NRR = ($4,221 - $221 + $500) / $4,221 = $4,500 / $4,221 = 107%. That is healthy.
What it tells you
- Whether the customer base is growing or shrinking even without new acquisition.
- The single highest-signal SaaS investor metric. Many investors weight NRR above ARR growth.
- Quality of the customer relationship. High NRR means customers want more, not less.
What it does NOT tell you
- New customer acquisition rate. NRR only measures the existing base.
- Why customers expanded or churned. Direction without reason limits the fix.
- Whether expansion is sustainable. Often expansion is a one-time event (seat addition); recurring expansion is rarer.
Common miscalculations
- Mixing new customer revenue into NRR. NRR is cohort-locked; only count revenue from customers who were in the cohort at the start.
- Calculating over too short a period. Quarterly NRR is noisy; 12-month NRR is the standard.
- Using net dollar retention (NDR) and NRR interchangeably. They are the same metric; consistency in naming matters when comparing across reports.
Frequently asked
- What is 'world-class' NRR?
- 130%+ is the world-class threshold cited in SaaS investing circles. For indie SaaS at $30-$100/month price points, 105-115% is realistic and healthy; 130%+ usually requires a multi-tier or usage-based pricing model.
More retention metrics
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