The Community Health Metrics Cheat Sheet

Divide the number of members who posted, commented, replied, attended, or voted in the last 30 days by your total active member count. Multiply by 100. That is your monthly participation rate.

Healthy communities typically sit at 30 to 40 percent monthly participation. Below 20 percent and you have a retention problem building. Above 50 percent and you have something rare. Do not benchmark yourself against total member count, benchmark against active members only.

Separate your lurker segment from your active count. People who joined but never posted are not community members yet, they are prospects. Including them in your participation denominator will depress your rate and obscure the health of your real community.

Take the number of members at the end of a month minus new members acquired that month, then divide by members at the start of the month. Multiply by 100. This strips out new member noise and shows you whether existing members are staying.

Most community churn happens in the first 90 days. If a member has not had a meaningful interaction within their first 30 days, the chance of them reaching 90 days drops sharply. Measure 30-day and 90-day retention separately, not just annual renewal.

Below 70 percent monthly retention means you are running a leaky bucket. You can keep acquiring new members and still shrink. Fix retention before scaling acquisition or you are paying to churn faster.

Track the ratio of member-to-member interactions versus member-to-host interactions. In a healthy community, at least 60 percent of meaningful interactions happen between members, not from members toward the host or moderators.

Send a short survey asking: have you had a direct conversation with another member in the last 30 days? If fewer than 40 percent say yes, your community is structured as a broadcast channel, not a network. That structure does not retain.

Members who have formed at least one genuine peer relationship inside your community are significantly less likely to leave, even when the content calendar is quiet. Relationships are stickier than content. Build connection structures deliberately.

Do not leave this vague. First value is a specific action: posted their first question and got a reply within 24 hours, attended their first live session, made a connection that led to a real conversation, used a template or resource that saved them time. Pick one. Measure it.

New members should hit their first value moment within seven days of joining. Communities that get new members to a first value moment within 48 hours show materially better 90-day retention than communities where first value happens on week three.

Do not wait for new members to find it. Build a structured first-week sequence: a welcome prompt that is easy to respond to, an introduction ritual that gets replies, a direct nudge toward one specific resource or event. Passive onboarding is why good communities still churn new members.

Take the number of members who created original posts or started threads in the last 30 days, divide by total active members, multiply by 100. Anything below 5 percent means your content ecosystem depends on a very small group of contributors.

Run this thought experiment monthly. If your top three contributors stopped posting tomorrow, would the community continue to generate discussion on its own? If the answer is no, you have a concentration risk. Identify your next tier of contributors and actively develop them.

Low-effort contribution formats get more people posting. Polls, fill-in-the-blank prompts, weekly check-in threads, and reaction-based responses all lower the barrier to contribution. Members who interact with a low-effort prompt are more likely to post original content in the following week.

Divide the number of members who attended at least one live event in the last 30 days by total active members. This is different from counting attendees per event. You want to know what percentage of your community is engaging with live touchpoints at all.

When attendance drops, the instinct is to question the event topic or format. That is rarely the issue. Declining attendance usually signals one of three things: members do not feel the investment is worth their time, the event time no longer fits their schedule, or they have already quietly decided to leave and are winding down.

Members who attend at least one live event per month renew at significantly higher rates than members who only consume async content. If you have a paid community, make attendance visible in your renewal data and you will almost certainly find this pattern in your own numbers.

Ask members: on a scale of 0 to 10, how likely are you to recommend this community to a colleague or peer? Anyone scoring 0 to 6 is a detractor. Anyone scoring 7 or 8 is passive. Anyone scoring 9 or 10 is a promoter. Subtract detractor percentage from promoter percentage to get your community NPS.

Community NPS above 30 is solid. Above 50 is strong. Above 70 is exceptional. Below 20 and you have a significant satisfaction problem that will show up in churn within two to three months if left unaddressed.

Do not send detractors a generic survey follow-up. Have a human reach out directly within 48 hours. Ask one open question: what would need to be different for this community to feel worth your time? The answers from detractors contain more useful information than the answers from all your promoters combined.

Check these four numbers each week: number of new posts from members (not the host), number of new members who posted or attended anything in their first seven days, any cancellation or pause requests received, and attendance at the most recent live event. Trends across these four numbers will surface almost every community health problem before it compounds.

Run a full metrics audit (all seven metrics in this cheat sheet) when any of the following happen: participation rate drops more than 10 points in a single month, you receive three or more cancellations in a single week, attendance at live events falls below 15 percent of active members, or you realise you have not spoken directly with a member in over two weeks.

Metrics are not a report card. They are an early warning system. A community with an 18 percent participation rate is not failing, it is giving you a clear target. Track the trends, not just the snapshots, and you will always know what to work on next.