Free tools
Membership calculators.
Free calculators for understanding membership growth, retention, renewals, lapses and acquisition — built for people running membership organisations, not data specialists.
Not sure your figures tell the whole story?
Find out about the AuditMembership metrics
Growth Rate
Calculate your membership growth rate and understand what it does and doesn't tell you about your membership performance.
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Retention Rate
Calculate your membership retention rate and understand what it tells you about your membership performance.
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Renewal Rate
Calculate your membership renewal rate and understand how well your renewal opportunities are converting.
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Lapse Rate
Calculate your membership lapse rate — the share of renewal opportunities that end in a member leaving rather than renewing.
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Acquisition Rate
Calculate your membership acquisition rate and see how new-member acquisition compares to your existing membership base.
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Returning Member Rate
Calculate your returning member rate and see how much of your membership activity comes from former members rejoining.
Open calculator →How the metrics fit together
Membership performance is a system, not six isolated percentages.
At its simplest, every membership total is the result of the same equation:
Opening Members
+ New Members
+ Returning Members
− Lost Members
= Closing Members
Each calculator above measures one part of that equation. Growth rate measures the net outcome. Acquisition rate andreturning member rate measure what came in.Retention rate,renewal rate andlapse rate measure what stayed and what didn't.
Where the definitions and populations line up, growth is approximately new acquisition plus returning members, minus losses. In practice, be cautious about combining percentages calculated against different denominators or different measurement periods — that's a common source of numbers that look inconsistent even when nothing is actually wrong.
Used together, the aim isn't just to answer "what is my retention rate?" but to start understanding how membership performance works as a whole — and, from there, what would happen if you improved one part of it.
Want this live in your own data, not a one-off calculation?
Let’s talk and we’ll show you what a live membership dashboard would look like for your organisation.
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