Patient Acquisition Cost and ROAS: Know What a Patient Costs
Imagine a clinic where Facebook leads cost 8 euros and Google leads cost 25 euros (illustrative numbers). The obvious conclusion: "Facebook is better, right?"
Maybe. Maybe not. If only one in ten Facebook leads books and shows up, while one in three Google leads does, the picture changes completely. And if Google patients tend to come in for implants while Facebook patients come in for a checkup, it changes again.
Cost per click and cost per lead are useful, but they don't answer the question every clinic owner really cares about: what does it cost to get a new patient, and is it worth it? That's where patient acquisition cost (PAC) and return on ad spend (ROAS) come in.
Patient acquisition cost (PAC)
PAC is how much you spend, on average, to get one new patient who actually comes in.
PAC = marketing spend ÷ number of new patients who attended
Example (illustrative numbers): you spend 3,000 euros on ads in a month, and 20 new patients attend their first appointment from those ads. Your PAC is 150 euros.
What to include in "spend"
You can calculate PAC in two ways:
- Ad spend only. Useful for comparing channels.
- Total marketing cost. Ad spend plus agency fees, software, content production. Useful for understanding the true cost of growth.
Be clear about which one you're using, and use it consistently.
Why "attended" matters
Counting leads or booked appointments makes the numbers look better, but a patient who never shows up costs you money and brings nothing. Counting only attended patients gives you the honest number. That's also why our implant program only counts consultations that patients actually attend.
Return on ad spend (ROAS)
ROAS tells you how much revenue you get back for each euro spent on ads.
ROAS = revenue from patients acquired through ads ÷ ad spend
Example (illustrative numbers): you spend 3,000 euros, and the patients from those ads generate 15,000 euros in treatment revenue. Your ROAS is 5, or 5:1.
Which revenue to count
This is where clinics need to be thoughtful:
- First-visit revenue is easy to measure but underestimates value, because many patients start with a consultation and accept treatment later.
- Accepted treatment plan value gives a better picture for high-value treatments.
- Lifetime value includes future visits, family members and referrals. It's the most complete, but the hardest to measure.
A simple starting point: track revenue from new patients over their first 6 to 12 months.
ROAS is not profit
A ROAS of 5 doesn't mean you made five times your money. Treatment has costs: materials, lab fees, staff time, the chair. Know your margins, so you know what ROAS you actually need to be profitable.
Why these numbers change decisions
Compare channels fairly
The channel with the cheapest leads isn't always the one with the cheapest patients. Calculate PAC by channel, and you often find that a more expensive lead source brings better patients.
Set a sensible budget
If you know your PAC and the average value of a new patient, you can work out how much you can afford to spend to get one, and how much to invest to reach your growth goals.
Focus on the right treatments
High-value treatments like implants can justify a much higher PAC than routine checkups. Track PAC and ROAS by treatment where possible.
Spot problems in the funnel
If PAC rises, the chain tells you where: higher click costs, fewer inquiries, fewer bookings, more no-shows or lower acceptance.
What you need to track
To calculate PAC and ROAS reliably, you need to connect marketing data with clinic data:
- Spend by channel, from ad platforms.
- Inquiries by channel, from tracking and your CRM.
- Bookings and attendance, from your practice management system.
- Revenue per patient, from your billing system.
- Source of each patient, from tracking, UTMs and asking "How did you hear about us?"
This doesn't have to be perfect. A monthly spreadsheet that links these numbers is far better than guessing.
Be patient with the numbers
Some patients take weeks or months to decide, especially for big treatments. A campaign that looks expensive in its first month may look very different after three. Look at trends over time, not single months.
How we approach it
Our dashboards follow the chain from ad spend to inquiries, booked appointments and attended consultations, so clinics can see what a patient actually costs by channel. We guarantee 10–30 leads in the first month, and for implants we only count consultations patients actually attend. See how it works on our dental implant marketing page.
Want help figuring out what a new patient really costs you? Book a call with us.