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How to Calculate Churn Rate (Formula + Example)
Churn Rate is the percentage of customers who stop buying or cancel within a period. Calculate it by dividing the number of customers lost during the period by the number of customers at the start of the period, then multiplying by 100.
What is churn rate?
Churn rate is the percentage of customers who stop buying from you — or cancel a subscription — over a given period. It is the mirror image of retention: every customer who churns is one you have to replace through acquisition just to stay flat. For that reason, churn is one of the most consequential numbers a recurring or consumable business tracks.
Small differences in churn compound dramatically over time. A brand losing 5% of customers a month retains far fewer over a year than one losing 3%, because the loss applies to a shrinking base each period. Understanding and lowering churn is usually the highest-leverage way to grow lifetime value without raising acquisition spend.
The churn rate formula
Churn Rate = (Customers lost during period ÷ Customers at start of period) × 100
- Customers lost during period — the number of customers who cancelled or lapsed during the window. Crucially, exclude new customers acquired during the period from this count.
- Customers at start of period — the count of active customers at the beginning of the window.
- × 100 — converts the ratio to a percentage.
For non-subscription brands, "lost" means lapsed: a customer who has passed a defined threshold beyond their normal reorder cycle without purchasing again.
How to calculate churn rate: a worked example
Take a subscription-style consumable brand reviewing a single month.
- Customers at start of the month: 4,000 active customers.
- Customers lost during the month: 220 cancelled or lapsed. (New signups during the month are excluded from this count.)
- Divide. 220 ÷ 4,000 = 0.055.
- Convert to a percentage. 0.055 × 100 = 5.5%.
Monthly churn is 5.5%. To see the annual impact, the brand can compound it: retaining 94.5% each month means roughly 0.945 raised to the 12th power survives the year — about 51%. Phrased plainly, at 5.5% monthly churn the brand loses close to half its starting base over twelve months, which makes even a one-point reduction materially valuable.
What's a good churn rate?
Acceptable churn depends heavily on your model and price point, so external numbers are guides, not goals. Many subscription businesses aim for monthly customer churn in the low single digits, often cited in the 3–7% range, while annual figures and non-subscription lapse rates differ substantially. Higher-frequency consumables tend to expose churn faster than infrequent purchases.
Rather than chasing a benchmark, watch your churn trend and segment it. Separate voluntary churn (active cancellations) from involuntary or passive lapse, and look at when in the lifecycle customers leave. A spike right after the first consumption cycle points squarely at the reorder moment being missed.
How to improve churn rate
Much churn in consumable brands is silent: the customer doesn't cancel angrily, they simply run out and never get a timely prompt to restock. Closing that gap is the single biggest lever. When the reorder reminder reaches a customer as they run low — and the path back to purchase is frictionless — many would-be lapses convert into a reorder instead of a churn event. For genuinely at-risk and already-lapsed customers, targeted win-back outreach recovers a meaningful slice that calendar campaigns miss.
This is the loop replenishment timing is designed to protect. An AI replenishment engine like reOtter predicts per-customer run-out and triggers the right moment — a reorder reminder before lapse, an at-risk nudge when behavior slips, or a winback when a customer has gone quiet — each routed to a one-click reorder storefront. By catching customers at the precise point churn usually happens, that timing precision reduces silent lapse. The merchant owns the rules; the AI does the math on who's drifting and when.
Key takeaways
- Churn rate = customers lost ÷ customers at start of period × 100; exclude new customers from the lost count.
- For non-subscription brands, define churn as lapse past a threshold beyond the normal reorder cycle.
- Small churn reductions compound powerfully, and the highest-leverage fix is catching silent lapse at run-out.
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Frequently asked questions
- What is a good churn rate?
- Lower is better, but acceptable ranges vary by model. Many subscription businesses target monthly churn in the low single digits, often cited around 3–7%, which compounds significantly over a year. For non-subscription consumable brands, churn is fuzzier and best tracked as lapsed-customer rate against your consumption cycle.
- What's the difference between customer churn and revenue churn?
- Customer churn counts how many customers you lost. Revenue churn measures how much recurring revenue you lost, which weights larger accounts more heavily. A brand can have low customer churn but high revenue churn if its biggest customers leave. Track both to see whether you're losing many small customers or a few valuable ones.
- How do I calculate churn for a non-subscription brand?
- Without cancellations, define churn as lapse: a customer is churned once they pass a threshold beyond their normal reorder cycle without buying again. For a 30-day product, you might flag a customer as lapsed at 60 or 90 days. Then apply the same lost-over-starting formula to that lapsed count.
- Is churn rate the opposite of retention rate?
- Closely related but not identical. For a simple period, retention rate plus churn rate of the existing base sums to roughly 100%. They diverge once you factor in new customers, since retention typically measures the surviving share of an existing cohort while churn measures the lost share. Define both clearly before comparing.