Gross and net churn are two of the most consequential metrics in subscription finance — and the difference between them is what separates a struggling subscription business from a compounding one. Get the distinction wrong and you can talk yourself into thinking your retention is fine when it is not (or panic when you are doing well).
Definitions side by side
- Gross churn = (revenue lost from cancellations + downgrades) ÷ starting MRR. Always positive.
- Net churn = (revenue lost − expansion revenue from existing customers) ÷ starting MRR. Can be negative if expansion exceeds losses.
Net churn is the more honest economic metric because it captures the full picture of what is happening inside your customer base. Gross churn is the operational metric — it tells you how much retention work is left to do.
Negative net churn is the goal
The holy grail of subscription business is "negative net churn" — meaning expansion revenue from existing customers more than offsets revenue lost to churn. It means your customer base is growing in dollars even before any new acquisition. Best-in-class B2B SaaS achieves negative net churn through usage-based expansion, seat additions, and product upsells. For Shopify subscription stores, expansion comes from upgraded plans, build-a-box additions, and one-time portal add-ons.
Negative net churn means your existing customers are growing your revenue faster than your churn is shrinking it — a compounding flywheel without acquisition spend.
Which one should you report?
Track both. Gross churn for the retention team (how much are we losing and why). Net churn for the executive team and investors (is the customer base economic engine healthy). Reporting only net churn hides retention problems behind expansion; reporting only gross churn misses the recurring value created by expansion. The pair tells the whole story.
For revenue retention as a positive-framed metric, see net revenue retention.