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Refill retention cohort calculator
Enter starting patients, month-one churn and later monthly churn to see how many patients are still active each month and how many fills one starting patient brings in a year.
Refill retention cohort
Enter your numbers to see the result.
Free tool by Telehealth Media · telehealthmedia.com
How it works
Telehealth refills usually lose the most patients in month one, then settle. A single churn rate hides that, so this calculator takes month-one churn and later churn separately.
- Active after month 1 = starting patients x (1 - month-one churn)
- Each later month = previous month x (1 - later churn)
- Fills per starting patient (12 months) = sum of active patients in months 0 to 11 / starting patients
Fills per starting patient is useful for value: multiply it by gross profit per fill for a cautious 12-month patient value. The curve downloads as CSV.
Worked example
A cohort starts with 1,000 patients. 30% cancel after the first month and 10% a month after that.
| Step | Result |
|---|---|
| Active after month 1 | 700.0 |
| Active after month 6 | 413.3 |
| Active after month 12 | 219.7 |
| Fills per starting patient, 12 months | 5.80 |
These numbers illustrate the formula; enter your own.
Telehealth notes
- Month-one churn is where creative matters most after acquisition: ads that set honest expectations bring patients who stay longer.
- Measure churn per cohort (patients who started in the same month), not across the whole base, or growth will hide it.
Questions
What is a retention cohort?
A group of patients who started in the same period, followed over time to see how many stay.
Why separate month-one churn?
Because it is usually much higher than later churn in telehealth. One averaged rate would overstate early retention and understate later retention.
Are my numbers stored?
No. The calculation runs in your browser and nothing is sent to us.