Churn rate is the percentage of customers (or revenue) you lose over a period. It's the silent killer of SaaS: a company growing 10% monthly with 8% churn is sprinting on a treadmill.

The formula: churn rate = customers lost in period ÷ customers at start of period.

Customer churn vs. revenue churn

Customer (logo) churn — share of accounts lost. Treats a €10 customer and a €10,000 customer the same.
Gross revenue churn — share of MRR lost from cancellations and downgrades.
Net revenue churn — revenue churn minus expansion revenue. The number that can go negative — when upsells outgrow losses, your revenue grows even with zero new customers. That's the SaaS holy grail.

What's a "good" churn rate?

Segment	Healthy monthly churn
SMB SaaS	3–5%
Mid-market	1–2%
Enterprise	<1%

Early-stage products run higher — what matters is the trend and why people leave.

8 ways to reduce churn

Fix activation first. Most "churn" is users who never reached the aha moment. That's an onboarding problem wearing a churn costume.
Watch usage, not invoices. A customer who stops logging in churns weeks before the cancellation. Alert on usage drops, not just failed payments.
Recover failed payments. Involuntary churn (expired cards) is often 20–40% of the total. Dunning emails and card updaters are free retention.
Talk to churned users. Five exit interviews beat any dashboard at telling you why.
Build habit loops. Tie the product to a recurring trigger — a weekly report, a daily streak, a Monday digest. See product loops.
Surface value received. "You saved 14 hours this month" emails remind people why they pay.
Offer a downgrade path. A €19 plan keeps a customer a €0 cancellation loses forever.
Set churn alerts on the metric itself. A 2-point cohort dip should be a same-day alert, not a quarterly surprise.

Churn and LTV are the same lever

Cutting monthly churn from 5% to 3% extends average customer lifetime from 20 to 33 months — a +65% LTV jump that transforms your LTV:CAC ratio without touching acquisition.

FAQ

How do you calculate churn rate? Divide the customers lost during a period by the customers you had at the start of it. For revenue churn, do the same with MRR.

What is the difference between churn and retention? They're complements: 5% monthly churn = 95% monthly retention. Same phenomenon, opposite framing — see our retention guide.

What is negative churn? When expansion revenue from existing customers exceeds the revenue lost to cancellations — net revenue churn below 0%.

What causes most SaaS churn? Failed activation (users never got value), usage decay that nobody noticed, and involuntary churn from failed payments.

Track churn, cohort retention, and MRR live — with alerts when they slip — on the GrowthPilot cockpit.