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Are my customers coming back?

Enter your numbers below. Get the answer first, then Koala's next move.

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Numbers to enter
Use one fixed starting cohort. Each retained count must be a subset of that original cohort and therefore cannot exceed it.
Koala's Calculated Result
Point-in-time retention for the same original cohort.

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The detailed explanation will appear here once the calculator has a result.

Retention is reported month by month; MarginKoala does not invent a universal healthy-retention threshold or treat a simple three-month average as a standard KPI.

Koala's Professional Opinion

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Definition and method

What this calculator answers

Per-month retention curve for a same-period cohort — the headline product-market-fit lens for any subscription / membership business.

Retention curve

Retention curve = retained N / cohort size, for N = 1, 2, 3. The per-month survival of a same-period cohort — the headline metric for product-market fit.

Worked example: your figures

The interactive result above is the worked example. Change any input and the same deterministic engine recomputes the answer; this page does not insert a generic example business or silently treat example values as a benchmark.

  • No market benchmark or outcome is silently inserted by this page.

What should I check next?

Frequently asked questions

What is cohort retention?

Cohort retention = customers retained ÷ cohort size at a chosen month. The % of a same-period cohort still transacting at month N — the right read for product-market fit and the per-cohort engagement loop.

Cohort Retention

What's a typical cohort retention curve?

Use the calculator result for the inputs entered and keep any market-response or operating recommendation separate from the deterministic calculation. Support that additional assumption with the business’s own evidence or an explicitly labelled scenario.

Cohort Retention

How do I read retention at 1/2/3 months?

Compare the three — what % of the cohort still transact by month 1, by month 2, by month 3. The pattern is more telling than the absolute number: a flat line suggests a real retention curve; a steep slope suggests a real churn risk.

Cohort Retention

Should I weight by revenue or by customer count?

Both — look at customer retention (% of customers who remain) and revenue retention (% of revenue retained). A high revenue retention with low customer retention signals churn on small-ticket buyers; the converse signals churn on big spenders.

Cohort Retention

Educational use, not financial advice. Numbers are estimates for planning; consult a qualified professional before acting on them.