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Sauna Session Client Retention Calculator

Measure how effectively a sauna session offering keeps existing clients over a selected period. The calculator removes newly acquired clients from the ending client count, then compares the remaining clients with the number who were active at the start.

This retention view is useful for monthly, quarterly, or other cohort-style reviews as long as all three counts use the same period definition. It can help operators separate growth from loyalty: a rising ending client count can still mask weak retention when many of those clients are new.

Retention inputs

Result
—
Client retention rate
Retained existing clients—
Clients lost from starting base—
Churn from starting base—

1. Choose one review period
Use the same start and end dates for every client count.

2. Record starting clients
Enter the clients active in the sauna service at the beginning of the period.

3. Enter new clients
Count clients who first became active during the period so they can be removed from the ending base.

4. Record ending clients
Enter the total active client count at the end of the same period.

5. Interpret retention and churn
Review the retained-client count, retention percentage, and loss from the starting base together.

Retained existing clients = Ending clients − New clients
Retention rate = Retained existing clients ÷ Starting clients × 100
Churn rate = 100 − Retention rate

The method assumes the three counts follow the same definition of an active client and the same measurement window. Transfers, reactivations, pauses, or duplicate client records may require a cohort-based analysis instead.

What the result means

The retention rate estimates the share of starting clients who remain active at the end of the selected period.

A consistent definition of active client is essential for period-to-period comparison.

Given: A sauna service begins a quarter with 310 active clients, adds 68 new clients, and finishes with 285 active clients.

Calculation: Retained existing clients = 285 − 68 = 217. Retention = 217 ÷ 310 × 100 = 70.0%. Churn = 30.0%.

Result: Client retention rate = 70.0%.

The service retained 217 of the 310 clients who were active at the start of the quarter.

Why are new clients subtracted from ending clients?

Retention is intended to measure how many clients from the starting base remained. Removing new clients prevents acquisition during the period from inflating the retained-client count.

Can I use weeks instead of months?

Yes. Use any period length as long as the start, new, and end counts all refer to that same period and the active-client definition is consistent.

How are reactivated clients handled?

This simple model may treat them inconsistently depending on your records. For detailed lifecycle reporting, track a defined starting cohort and classify reactivations separately.

What does a retention rate above 100% mean?

For this model it indicates inconsistent inputs, because retained clients from the starting base cannot exceed the starting count. Recheck whether new clients or ending clients were classified correctly.

Is retention the same as repeat-visit rate?

No. Retention tracks whether clients remain active across a period, while repeat-visit rate usually measures whether or how often a client returns for another visit.