Membership churn rate: formula and cost

01/ The membership churn rate formula

Members lost, divided by members at start.

Take the members you had on the first day of the period. Count how many of those same people had left by the last day. Divide, and multiply by 100.

Leave joiners out of both numbers. A member who joined in month four and left in month nine is real attrition, but counting them against the opening base inflates the rate and makes it impossible to compare one year with the next.

Track those in-year joiners as their own cohort instead. Their churn is usually the highest you will see, which is the point of the first-year section below.

Churn and retention always add up to 100% for the same cohort and period. If you already report a renewal rate, the churn rate is one subtraction away; the full retention formula, with joiners handled, is on the membership retention rate page.

02/ What churn rate is normal for associations?

Read the benchmark as churn, not renewal.

Marketing General Inc.’s 2026 Membership Marketing Benchmarking Report puts the median renewal rate at 82%, which Tony Rossell notes has moved only slightly for nearly a decade (MGI 2026, via Tony Rossell). Turned round, that is a median annual churn of 18%.

It is a US industry survey of associations, not a UK statistic. Nobody publishes an equivalent UK median, so treat it as a reference point rather than a norm for your sector.

Rossell draws a blunt conclusion from the stable median: unless an association is fixing a major flaw in its value proposition or renewal system, “it cannot renew its way into growth” (MGI 2026). Cutting churn protects the base; growth still needs joiners.

Segment benchmarks by organisation type, and gym figures, are kept on their own pages: membership retention rate and gym membership retention rate.

03/ Annual versus monthly churn

Monthly churn compounds; never multiply by twelve.

Monthly memberships and direct debits push teams to report churn per month. Annual memberships report it once a year. The two cannot be compared until one is converted.

The shortcut of multiplying monthly churn by twelve overstates annual churn, because each month’s loss comes off a base that has already shrunk.

Convert properly: annual retention = (1 − monthly churn)¹². Annual churn is 1 minus that. Going the other way, monthly churn = 1 − (annual retention)^(1/12).

So 2% a month is not 24% a year; it is about 21.5%. And the 18% median annual churn is about 1.64% a month, a number worth knowing if you are moving members onto monthly payment.

04/ Voluntary versus involuntary churn

Two kinds of attrition, two different fixes.

Voluntary churn is a member deciding to go: the value no longer justifies the fee, they changed career, retired or joined a rival. Its fix is value, engagement and a renewal conversation.

Involuntary churn is a member who meant to stay but lapsed anyway: a card expired, a direct debit mandate was cancelled with a bank switch, an invoice went to a departed finance contact, the reminder went to an old address.

Report them separately. A single churn figure hides which problem you have, and the involuntary kind is usually cheaper and faster to fix: card updates, a payment-failure sequence, a grace period and correct contact data.

Code every lapse with a reason at the time it happens. “Unknown” as the largest category is itself a finding; the membership retention review shows how to audit lapse reasons properly.

05/ First-year attrition

New members churn fastest.

In MGI’s 2024 report the median first-year renewal rate was 75% across 333 responding associations (MGI 2024). That is a 25% first-year churn, against 18% for the membership overall in the 2026 edition. The two figures come from different editions of a US survey.

The practical reading: a large share of your annual churn is made in the first twelve months. Split your churn rate into first-year and established members before you decide where to spend.

The fixes for first-year churn sit in member onboarding; the fixes for the reminder cycle sit in membership renewals.

06/ The cost of membership churn

Churn costs the fee, and the years after.

The visible cost is the lost subscription. The larger cost is the renewals that member would have paid in future years, plus the cost of recruiting a replacement just to stand still.

Expected tenure is roughly one divided by annual churn. At 18% churn a member stays about five and a half years on average; cut churn to 15% and that rises to nearly seven. Each point of churn changes lifetime value, not just this year’s income.

Put your own numbers into the membership churn cost calculator to see the revenue at stake, then the member LTV calculator for what a retained member is worth.

07/ Auto-renewal and the law

Subscription rules change in January 2027.

Part 4, Chapter 2 of the Digital Markets, Competition and Consumers Act 2024 creates a regime for consumer subscription contracts, including reminder notices before a renewal payment so the consumer can decide whether to end the contract first (DMCC Act 2024).

The draft Consumer Subscription Contracts (Cancellation and Information) Regulations 2026 state they come into force on 1 January 2027 and apply only to contracts entered into from then (draft Regulations 2026, reg 1–2). The Department for Business and Trade published guidance on 19 October 2026 (DBT).

Whether your membership is in scope depends on what it is and who it is sold to; the guidance sets out exclusions. Check it, take advice, and do not treat easier exit as a churn problem to engineer around. A clear reminder that a member chooses to act on is still a renewal.