ClinicGrower knowledge base
How to calculate patient acquisition cost for your clinic
By ClinicGrower · Updated · Guidance for clinic owners and their teams
In this guide
The calculation
Patient acquisition cost = acquisition costs ÷ new paying patients acquired
Choose the cost definition before comparing results:
- Advertising-only cost: the ad spend associated with the enquiries.
- Fuller acquisition cost: ad spend plus the agreed share of management, creative, landing-page and enquiry-handling costs.
Keep those definitions separate. A £100 advertising-only cost cannot be compared fairly with a £150 figure that includes all those services.
If no new paying patients have yet been recorded, do not report an acquisition cost of £0. Show the spend, the pending outcomes and that a finite acquisition cost cannot yet be calculated.
Allow enquiries time to progress. A consultation this month may become a paying patient later. Follow a defined group of enquiries through a stated observation period, rather than assuming that this month's spend created every payment received this month.
A hypothetical example
A clinic spends £2,000 on advertising. It also allocates £1,000 of management, creative and enquiry-handling costs to the campaign.
The campaign produces 100 unique enquiries. Twenty become new paying patients within the observation period.
| Measure | Calculation | Result |
|---|---|---|
| Advertising cost per enquiry | £2,000 ÷ 100 | £20 |
| Advertising-only patient acquisition cost | £2,000 ÷ 20 | £100 |
| Fuller patient acquisition cost | £3,000 ÷ 20 | £150 |
These are invented figures to explain the calculation, not ClinicGrower results or a clinic benchmark.
What is a good acquisition cost?
An affordable acquisition cost depends on what remains after delivering the treatment or service, the clinic's capacity and the return it needs. Revenue alone cannot answer that question.
Suppose a new patient's initial treatment produces £700 in revenue and £300 in directly attributable delivery costs. That leaves £400 before acquisition costs and overheads. A £150 acquisition cost leaves £250 to contribute towards overheads and profit. It does not prove £250 of net profit.
Include repeat treatment only when you have a credible basis for it. Keep observed revenue or contribution to date separate from estimated future patient value. A projected lifetime value is not money already received.
How does cost per lead relate to patient acquisition cost?
When the costs and enquiry group match:
Advertising-only patient acquisition cost = cost per enquiry ÷ enquiry-to-patient conversion rate
In the example, £20 ÷ 20% = £100.
A low cost per enquiry can still be expensive if few enquiries become suitable paying patients. A higher-cost channel can be useful when it brings patients the clinic can appropriately serve.
Use it to plan a budget
If the clinic's observed fuller acquisition cost is £150, acquiring 20 comparable new patients would imply £3,000 of acquisition costs at the same efficiency. Treat this as a planning scenario. More spend can change costs, demand, patient mix and staff capacity.
Model a cautious case as well as your current result, and keep the costs of delivering care outside the marketing budget.
What to check before acting
1. Remove duplicate enquiries and separate existing patients from newly acquired patients. 2. State which costs are included and how shared costs are allocated. 3. Use the same source, treatment and time definitions across comparisons. 4. Record people still deciding separately from completed outcomes. 5. Compare contribution and capacity alongside acquisition cost.
Advertising platforms count the conversion actions configured in the account. Those actions may represent enquiries, bookings or other events, so verify what a “conversion” means before calling it a new patient. Google Ads conversion data guidance
Start with the stage you can measure reliably
For a real example, explore the Snoring and Sleep Clinic campaign snapshot. It shows advertising spend and recorded action types, with the distinction from confirmed patients made explicit.
If you can currently verify only enquiries and bookings, report those honestly and improve the connection to later outcomes. Understand marketing attribution and measure marketing ROI.
Start Your Free Clinic Growth Audit for a preliminary review of your clinic's visible marketing and enquiry journey.
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Questions clinic owners ask
How should a clinic calculate cost per new paying patient?
Divide the acquisition costs included in your calculation by the number of new paying patients in the same cohort. State whether the costs include advertising, agency fees or other acquisition work, and allow for enquiries that have not yet reached an outcome.
Why is cost per enquiry different from patient acquisition cost?
Not every enquiry becomes a paying patient. Cost per enquiry measures the top of the journey; patient acquisition cost includes the conversion outcome. Compare both to identify whether the constraint is demand, enquiry handling or conversion.