What is Churn Rate?
Churn rate is the percentage of customers who stop being customers (cancel, fail to renew, lapse) during a given period. Monthly churn for B2C SaaS typically ranges 3-7%; for B2B SaaS 1-2%; for consumer subscription 2-5%. Net Revenue Retention (NRR) — the complementary metric — measures revenue from existing customers including expansion (upsells, add-ons); NRR above 100% means existing customers grow revenue net of churn. Churn drivers include product-market fit issues, competitive pressure, pricing, support quality, and customer success engagement. Reducing churn is often the highest-ROI lever in a subscription business — a 1-point monthly churn reduction can compound into 30-40% more lifetime customers.
How Churn Rate actually works
The framework breaks down into the following moving parts. Knowing what each piece is — and what it is not — is what separates a B-grade answer from an A-grade answer in a written assignment.
- Customer churn = customers lost / starting customers (per period)
- Revenue churn = revenue lost / starting revenue
- Net revenue retention (NRR) includes expansion
- Track by cohort and segment
- Reduce through onboarding, support, customer success
A worked example: Netflix
Netflix's churn rate is among the lowest in subscription consumer at ~2-3% per month. The firm's investment in original content, personalization, and pricing (the cheapest entertainment per hour by far) keeps cancellation low. When Netflix raised prices in 2022-2023 and tightened password sharing, churn briefly spiked but stabilized as the perceived value held. Compare to news subscription where churn often runs 6-8% monthly — the perceived value declines after the news cycle ends. Subscription businesses live and die by churn; even Netflix tracks it weekly at the executive level.
Don't lose marks for these
- Confusing churn with attrition (different definitions)
- Not segmenting churn by cohort, segment, or channel
- Optimizing acquisition without addressing churn
How to use this on the exam
Score-maximizing moves
- Define both customer and revenue churn
- Cite NRR as complementary metric
- Show cumulative compounding effect
When to use Churn Rate (and when not to)
Use Churn Rate when your assignment asks you to analyze, structure, or recommend — and when you have at least two data points to populate every cell of the framework. Skip it when the question is asking for a numerical answer or a single recommendation, since Churn Rate is a structuring tool, not a calculator.