Membership Churn Cost Calculator

Every membership organisation runs a leaky bucket.

You pour new members in at the top through recruitment, and members drain out of the bottom through churn.

As long as the leak is there, you are spending to acquire revenue you already had.

This calculator puts a pound figure on that leak.

The headline is the annual loss: members lost times average revenue per member.

But the real damage compounds.

Left unreplaced, this year’s lapsed members would have renewed next year and the year after — so the three-year cost is materially larger than three times the annual figure.

And none of this counts the ancillary spend or referrals those members would have brought, all of which feed your lifetime value.

The encouraging side is leverage.

Because churn acts on your whole base, cutting it by even two or three points keeps a surprising amount of revenue in the bucket every year — and Harvard Business Review reports that keeping a member is five to 25 times cheaper than acquiring a new one.

In a membership-specific study, the IMPACTS Value Study found renewing members cost only $4–5 a year to retain versus $20–25 to serve a new one.

You can put your own numbers on that gap with our acquisition vs retention calculator.

For context, Marketing General’s 2025 benchmarking report puts the median association renewal rate at 84% (74% for first-year members).

Churn is simply the mirror of retention — churn rate = 1 − retention rate — so those medians translate to roughly 16% annual churn overall and 26% among first-year members.

Churn also sets how long members stay: average tenure = 1 ÷ churn rate. At 16% churn a typical member stays around 6.3 years; let churn drift to 20% and tenure drops to five. You can benchmark your own rate with the membership retention calculator.

That is the core case for investing in member retention and onboarding, where most renewals are really won.