Customer retention rate is the cleanest single number for measuring how sticky your business is. It is the inverse of churn, but it reframes the question from "how many did we lose?" to "how many did we keep?" — a small linguistic shift that tends to change which interventions get funded.
The formula
CRR = ((Customers at end of period − New customers in period) ÷ Customers at start of period) × 100
The subtraction matters. Without it, growing businesses look like they have flawless retention because new acquisitions mask the customers leaking out the bottom.
Example: you start the month with 1,000 subscribers, acquire 200 new ones, and end with 1,100. CRR = ((1,100 − 200) ÷ 1,000) × 100 = 90%. You retained 90% of the customers you started with.
The right period to measure
Most subscription businesses report retention rate in three windows:
- Monthly CRR — operationally useful, sensitive to short-term issues.
- Quarterly CRR — smooths out monthly noise; useful for trend conversations.
- Annual CRR — the headline number for boards and investors.
Compounding matters here. A 95% monthly retention rate sounds great but compounds to 54% annual retention (0.95^12). A 98% monthly retention rate compounds to 78% annual. The differences feel small per month and are enormous per year.
Retention rate vs. churn rate
They are mathematical inverses: retention rate + churn rate = 100%. But teams often track them separately because they trigger different conversations. Retention frames the question around what is working; churn frames it around what is broken. Both have a place. See retention rate vs. churn rate for a fuller comparison.
What CRR alone does not tell you
Retention rate is a percentage; it does not weight by revenue. A merchant losing high-LTV customers and gaining low-LTV ones can show flat CRR while revenue retention is collapsing. Pair CRR with gross revenue retention for the full picture.
What is a good retention rate for a subscription business
Heavily category-dependent. Replenishment (vitamins, coffee, pet food) often retains 70–85% at 90 days. Curation and content tend lower, 50–70% at 90 days. Annual retention for healthy DTC subscriptions sits in the 40–70% range. Compare against your own prior cohorts before you compare against external benchmarks — improvement over time matters more than absolute level.