Startups & Business › Metrics & Unit Economics

Churn Rate

The share of customers or revenue lost in a period.

Also known as: churn rate, churn, customer churn, logo churn

Churn rate is the share of customers (logo churn) or revenue (revenue churn) lost per period. It is the tax on all growth: 5% monthly logo churn means replacing over 45% of customers yearly just to stand still. Growth with high churn is a treadmill set to sprint — exhausting, expensive, and eventually unwinnable.

start 1,000 → lose 50 (5%) → add 80 → end 1,030 (growth hides the leak; fix the leak first)

Measure both churns separately (logo vs revenue): losing many tiny accounts while keeping revenue differs totally from losing two whales. And always cohort it — blended churn mixes dying old cohorts with fresh ones, hiding both stories.

The classic mistakes:

• Celebrating gross adds. New logos masking churn in headlines and all-hands. Report net and churned absolute numbers side by side, every time.
• Involuntary churn ignored. Failed payments, expired cards, billing bugs — often a fifth or more of total churn, fixable with dunning flows and retries rather than product work. Split voluntary vs involuntary before strategizing.
• Averaging across segments. Enterprise 1% and SMB 12% blend into a meaningless middle. Churn is diagnosed per segment, fixed per cause.
• Win-back blindness. Churned customers re-acquire cheaper than cold prospects (they know the product). Systematic win-back beats pure acquisition on CAC every time — run it.
• Chasing zero churn. Some churn is healthy (bad-fit customers leaving improves focus and margins). Target the churn you can profitably prevent: onboarding failures, missing features with demand, support-caused exits.

The hierarchy: measure both churns by cohort, fix involuntary first (cheapest), then onboarding-driven, then value-driven — with customer success owning the motion and product owning the causes.