Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Lifetime gross profit per member
$280
Average member lifetime
14.3
Gross profit per member per month
$19.60
Months to recover acquisition cost
1.8
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How to use this
- 1Enter monthly churn rate (%).
- 2Enter membership price ($/mo).
- 3Enter gross margin after wash cost (%).
- 4Enter cost to acquire one member ($).
- 5Read your lifetime gross profit per member on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Unlimited wash memberships live and die on retention. A membership program with 5% monthly churn keeps the average member for about 20 months; at 10% monthly churn that average life drops to 10 months, roughly cutting lifetime value in half even at the same price point. This calculator converts a monthly churn rate into expected member lifetime in months, multiplies by monthly membership price and your gross margin percentage (after washing cost per visit) to get lifetime gross profit per member, then compares that against your cost to acquire a member through signage, staff commission, or digital ads to show acquisition payback period.
Worked example
Using the values the calculator loads with:
Inputs
- Monthly churn rate: 7 %
- Membership price: 28 $/mo
- Gross margin after wash cost: 70 %
- Cost to acquire one member: 35 $
Results
- Lifetime gross profit per member: $280
- Average member lifetime: 14.3
- Gross profit per member per month: $19.60
- Months to recover acquisition cost: 1.8
What each field means
Inputs
- Monthly churn rate (%)
- The monthly churn rate used in the calculation, measured in %. Starts at 7 % so you have a working example on load. Accepted range: 1–40 %.
- Membership price ($/mo)
- The membership price used in the calculation, measured in $/mo. Starts at 28 $/mo so you have a working example on load.
- Gross margin after wash cost (%)
- The gross margin after wash cost used in the calculation, measured in %. Starts at 70 % so you have a working example on load. Accepted range: 10–95 %.
- Cost to acquire one member ($)
- The cost to acquire one member used in the calculation, measured in $. Starts at 35 $ so you have a working example on load.
Results
- Lifetime gross profit per member
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Average member lifetime
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gross profit per member per month
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Months to recover acquisition cost
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What's a good monthly churn rate for a car wash membership?
Top operators run 4-7% monthly churn; anything above 10% signals a pricing, value, or convenience problem — usually too few locations under one membership, unreliable equipment causing bad experiences, or a price that doesn't feel worth it against local competitor unlimited plans.
Why does a small churn improvement matter so much?
Because lifetime is the inverse of churn, cutting monthly churn from 10% to 7% doesn't add 30% to lifetime value — it adds about 43% (10 months to 14.3 months). Small retention improvements compound heavily in subscription-style businesses, which is why operators invest in multi-site reciprocity and app-based pause features to reduce cancellations.
How is acquisition cost usually spent?
Common channels are signage and staff-driven upsell at the pay station (near-zero marginal cost beyond a small commission), direct mail, and local digital ads. Staff-driven signup conversion is typically the cheapest per-member acquisition cost, which is why tunnel operators emphasize signup scripts at the point of sale.
Does this model account for multi-site membership dilution?
No — this is a single-location model. Multi-site unlimited passes valid across a regional chain change wash-cost assumptions per visit (a member might wash more often since more locations are convenient) and typically also improve retention, both of which should be re-run with adjusted margin and churn inputs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Car Wash Tunnel Revenue Calculator
Project daily and monthly revenue for a conveyor tunnel wash from cars-per-hour throughput.
Car Wash IBA (In-Bay Automatic) Membership Value Calculator
Compare in-bay automatic single-wash economics against unlimited membership breakeven visits.
Car Wash Chemical Cost Per Car Calculator
Break down soap, wax, and drying agent cost per vehicle to true up wash package margins.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Car Wash Membership Churn & Lifetime Value Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/car-wash-membership-churn-value
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/car-wash-membership-churn-value" target="_blank" rel="noopener">Car Wash Membership Churn & Lifetime Value Calculator — RevenueLab</a> (2026).</p>
Source: [Car Wash Membership Churn & Lifetime Value Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/car-wash-membership-churn-value) (2026).