Definition
Subscription churn rate is the share of active subscribers a store loses in a period, calculated as subscribers cancelled or lapsed divided by those active at the start. It splits into two very different problems: voluntary churn, where a customer decides to stop, and involuntary churn, where a payment fails and the subscription ends without anyone choosing it. The two have separate causes and separate fixes.
Formula
Churn rate = Subscribers lost in the period ÷ Subscribers active at the start of the period × 100
- Subscribers lost
- Cancellations plus subscriptions that ended because payment could not be collected, counted once each in the period the subscription actually ended
- Subscribers active at the start
- Count of live subscriptions on the first day of the period, excluding those already paused or in a dunning process from an earlier cycle
One month, with the two kinds of loss separated
- Active subscriptions on the first of the month
- 3,400
- Cancelled by the customer
- 204
- Ended after repeated failed payments
- 119
- Total lost
- 323
- Churn rate
- 323 ÷ 3,400 = 9.5 percent
- Voluntary share of the loss
- 63 percent
- Involuntary share of the loss
- 37 percent
- What the split suggests
- More than a third of the loss is a billing problem rather than a product problem
Illustrative figures. A single churn number would have sent this store to work on its product and its emails, when a card updater, a better retry schedule and a clearer dunning sequence address a large part of the loss.
Why it matters
Churn decides whether a subscription business compounds. Every acquisition cost is repaid over a number of cycles, so the average number of cycles a subscriber completes sets how much a store can pay to acquire one and how long its money is tied up. It also changes the shape of growth: with low churn, new subscribers add to a stable base, and with high churn a rising share of acquisition spend goes to replacing people who have left. Because the involuntary half is usually a billing and communications problem rather than a product one, it is often the fastest part to improve and the part most stores measure least carefully.
Where it goes wrong
- Reporting one number without the voluntary and involuntary split, which hides a billing failure behind what looks like a product satisfaction problem
- Counting a pause as a cancellation, which overstates the loss and removes the credit for a retention option that is working
- Measuring in calendar months when the subscriptions renew on their own cycles, so a month with more renewal dates looks worse than one with fewer
- Ignoring where in the lifecycle the loss happens, since churn after the first delivery says something about expectations and churn after the sixth says something else entirely
- Reducing cancellations by making them hard to complete, which moves the loss to chargebacks and to reviews and costs more than it saves
Questions about subscription churn rate
What is the difference between voluntary and involuntary churn?
Voluntary churn is a decision: the customer no longer wants the product, has too much of it, or found something else. Involuntary churn is a failure: an expired card, a declined transaction, a bank block or an address change that breaks the billing. Involuntary churn usually responds to account updater services, sensible retry timing and a clear sequence of messages, none of which require changing the product.
How do you reduce cancellations without making them harder?
Offer the alternatives people actually want before offering to end the subscription: skip a delivery, change the frequency, swap the product, or pause for a stated period. Most cancellations at the first or second delivery are about timing and quantity rather than about the product, and a cancellation flow that leads with those options keeps subscribers who would otherwise leave permanently.
How does churn rate connect to lifetime value for a subscription store?
Churn sets the expected number of cycles, and the number of cycles multiplied by the contribution margin per cycle is the value of a subscriber. That is why a small change in churn moves lifetime value more than most pricing changes do, and why a subscription store that cannot state its churn cannot honestly state what it can afford to pay for a new subscriber.