Definition
Churn is the percentage of customers (or revenue) lost over a defined period — typically expressed monthly or annually — and the most important counterweight to acquisition in any subscription business.
Churn is the leak in the bucket. You can pour acquisition into the top, but if customers leave faster than you replace them, the business shrinks. SaaS investors care about churn before they care about CAC because high churn poisons every other unit-economic metric.
Two flavours matter: customer churn (count of customers leaving) and revenue churn (value of the contracts leaving). They diverge when small accounts churn but large ones stay — or vice versa. Both should be tracked, ideally with a 'net revenue retention' figure that includes expansion.
Origin
Subscription businesses tracked retention rates throughout the 20th century, but the term 'churn' became standardised in SaaS metrics writing in the late 2000s, alongside David Skok's LTV/CAC framework.
How it works
- Define the churn unit — customer churn vs revenue churn vs logo churn.
- Define the period — typically monthly, quarterly, or annually.
- Compute: customers lost / customers at start of period.
- Segment by cohort, plan tier, and channel of acquisition.
- Compare churn against industry benchmarks — SMB SaaS typically 3–7% monthly, enterprise 1–2% monthly.
When to use it
Use when
- On every subscription business, monthly minimum.
- By cohort to spot whether churn is improving for newer customers.
- By plan and segment to find the leak.
Skip when
- Reporting only blended churn. The average hides where the leak is.
- Without context. A 4% monthly churn is bad for enterprise, fine for SMB.
Key metrics
- Gross revenue churn (revenue lost / starting revenue).
- Net revenue retention (gross churn minus expansion revenue from existing customers).
- Customer churn rate (count of customers).
- Time-to-churn (median months from signup to cancellation).
Examples
- Monthly churn ticked up to 6% in Q2 — almost entirely in the smallest plan tier.
- Net revenue retention hit 112% — expansion now covers churn and then some.
- We can't out-acquire 8% monthly churn. Fix the leak first.
In practice at Makreate
Makreate doesn't run product, but the marketing work we ship can dramatically affect churn. A recent ecommerce subscription client had 9% monthly churn, mostly from people who never used the product after the first month. We rebuilt their post-purchase email lifecycle (welcome, onboarding, value reminders) and the first-90-day churn dropped 31% — without touching the product. Marketing's job after a sale is making sure the customer remembers why they bought.
Email Outreach Automation →Common mistakes
- Reporting blended churn instead of cohort churn. Cohort churn is the honest number.
- Treating involuntary churn (failed payments) like voluntary churn. Different problem, different fix.
- Confusing pause/downgrade with churn. They're different signals.
- Optimising acquisition while churn is still high. You're filling a leaky bucket.
Frequently asked
What's a healthy SaaS churn rate?
Enterprise SaaS: under 1% monthly. SMB SaaS: 3–5% monthly. Consumer subscription: 5–7% monthly. Higher than these and the business model needs work before scale.
Voluntary vs involuntary churn?
Voluntary = customer cancelled. Involuntary = card expired, payment failed. Involuntary churn can be 30–40% of total — and it's much cheaper to recover.
How is churn related to LTV?
LTV is roughly 1 / monthly churn rate × average contract value. Halving churn doubles LTV — which is why retention work has higher ROI than acquisition at most scales.