How to use this calculator
- Enter operating assumptions that match one consistent period.
- Review units carefully and keep costs, visits, or staff time on the same basis.
- Adjust the inputs to compare a conservative and an expected scenario.
- Use the main result with the supporting metrics before making an operating decision.
Formula
Retention rate = retained starting clients ÷ starting clients × 100. Ending clients = retained clients + new clients. Estimated revenue = total estimated visits × revenue per visit.
Percent inputs are converted to decimals inside the calculation. Monetary values are rounded only for display.
What the result means
The main result summarizes the operational constraint or financial threshold implied by the current inputs. Read it together with the secondary results: a single headline number can hide the effect of utilization, waste, client mix, or fixed cost.
Use the result as a planning estimate rather than a guarantee. Actual demand, staff performance, product usage, discounts, tax, and local requirements may differ.
Example calculation
84 of 120 starting clients returned, so retention is 70.0% and 36 clients were lost. Estimated period revenue is $8,870.40.
Practical tips
- Use recent invoices, payroll burden, and appointment records instead of memory.
- Run a conservative scenario for waste, cancellations, or lower utilization.
- Keep input units consistent; do not mix weekly volume with monthly costs unless labeled.
- Recalculate after a material price, wage, service-time, or workflow change.
- Treat decimal service capacity as planning information and round down when only complete services are possible.
Input reference
| Input | Unit | Example |
|---|---|---|
| Clients at period start | clients | 120 |
| Starting clients who returned | clients | 84 |
| New clients acquired | clients | 24 |
| Average visits per retained client | visits | 2.2 |
| Average visits per new client | visits | 1.1 |
| Average revenue per visit | $ | 42 |
Frequently asked questions
Who counts as a retained sunscreen client?
A retained client is someone in the starting cohort who completed the return action measured during the selected period.
Should new clients be included in the retention numerator?
No. New clients affect ending client count and revenue, but not retention of the starting cohort.
What if a client visits more than once?
Count the client once for retention, then use average visits to estimate total visits and revenue.
Can retention exceed 100 percent?
No. The calculator blocks a retained-client count above the starting-client count.
Does estimated revenue equal recognized revenue?
Not necessarily. It is a planning estimate based on entered visits and revenue per visit, before refunds, tax, or timing adjustments.