A practice owner tells us their Google Ads cost $18 per click. The number they usually haven’t worked out is what each new patient actually cost them.
That figure is almost always higher than the ad spend alone suggests. Patient acquisition cost is the single number that tells you whether your marketing is working, and most practices have never calculated it properly.
Key Takeaways
- The true cost of acquiring a new patient is total marketing spend divided by new patients, not just ad spend.
- Staff time, software, and website costs all belong in the calculation and are usually left out.
- The same enquiry can cost $125 or $200 depending on which expenses are counted.
- Paid ads, SEO, and referrals produce patients at different costs, and that’s normal.
- A high number isn’t a problem on its own; it depends on what that patient is worth over time.
Patient Acquisition Cost, Defined
Patient acquisition cost, or CAC, is the total cost of turning a stranger into a booked, paying patient. Not a click. Not a phone call. A patient who’s actually in the chair or on the table.
The Three Numbers Practices Confuse
- Cost per click: what you pay each time someone clicks the ad. Says nothing about whether they booked.
- Cost per lead: what it costs to generate an enquiry, such as a call or form fill.
- Cost per patient (CAC): what it actually costs to turn that enquiry into a booked, paying patient.
Get the definition wrong and every decision built on it is wrong too. A practice tracking cost per lead instead of cost per patient ends up chasing campaigns that generate cheap leads and expensive patients at the same time.
The Formula, and What Gets Left Out
Total acquisition spend divided by the number of new patients acquired equals CAC. On paper it’s a two-minute sum.
In practice, the “total spend” figure is almost always incomplete. A complete number includes:
- Ad spend across Google Ads, Meta, or any other paid channel
- Agency or freelancer fees for marketing for medical practices in Sydney and Melbourne
- Reception or admin time spent on enquiries
- Software costs, such as booking systems and call tracking
- Any website or content work tied to attracting patients
Leave out reception time and software costs, and a practice can understate its real CAC by 30 to 40 percent. That gap is exactly what leads an owner to believe a campaign is profitable when it’s actually break-even.
A Worked Example
Say a physiotherapy clinic in Pyrmont, Sydney spends $4,000 in a month:
- Google Ads: $2,500
- SEO retainer: $800
- Website hosting and a landing page update: $400
- Admin time chasing enquiries: $300
That’s $4,000 in total spend. If the clinic books 20 new patients from that activity, the sum is $4,000 divided by 20, or $200 per new patient.
Compare that to a clinic that only counts its $2,500 ad spend against the same 20 patients: $125 per patient. That’s a $75 difference per patient, and across 20 patients it’s $1,500 the owner didn’t account for. Across a year, it’s the difference between a marketing budget that looks profitable and one that actually is.
Why Does Cost Per Patient Differ by Channel?
Not every channel produces patients at the same price, and that’s normal. The mistake is assuming they should.
How the Main Channels Compare
- Google Ads for Sydney and Melbourne clinics: fast results, higher cost per patient, because you’re paying for visibility the moment someone searches.
- SEO for medical practices: slower to build, but cost per patient keeps falling once a page ranks.
- Referrals and repeat patients: the cheapest of all, since the acquisition work is already done.
A practice that only looks at this month’s numbers will favour paid ads every time, because they show results immediately. A practice that tracks CAC by channel over six or twelve months usually finds SEO and reviews pulling more weight than a single month’s dashboard suggests.
Website Conversion Rate Changes the Real Number
Two clinics can spend the same amount on the same keywords and still end up with very different acquisition costs. The reason usually sits on the website, not in the ads account.
Common Reasons Traffic Doesn’t Convert
- The site takes too long to load
- The phone number is hard to find
- The booking button isn’t obvious on mobile
The ad spend is identical in each case. The number of patients isn’t. This is why high-converting medical website design sits inside the acquisition cost conversation, not off to the side as a separate design project.
A website that converts 5 percent of visitors into enquiries, instead of 2 percent, effectively cuts CAC by more than half without spending an extra dollar on ads.
Is There a Good Benchmark?
There’s no fixed number that applies across every practice, and any article handing you one is guessing. The figure that actually matters is lifetime value against CAC: what a patient is worth across their full relationship with the practice, not just their first visit.
A cosmetic clinic in the Melbourne CBD charging $3,000 for a treatment can sustain a CAC of several hundred dollars. A suburban Sydney GP clinic charging a standard consult fee can’t.
Same formula, different answer. A $250 acquisition cost is a poor result if the patient never returns. It’s a strong result if that patient stays for five years and refers two friends.
Three Ways to Lower Acquisition Cost
None of these require a bigger budget. They require spending the same budget with a clearer picture of where it’s going.
- Fix the website before increasing spend. A slow or confusing site quietly taxes every dollar spent driving traffic to it, so this is usually the first place to look.
- Build a reviews process. Patients read reviews before they call. A steady stream of recent, genuine ones through a Google reviews strategy lifts conversion rate without touching the media budget at all.
- Track cost by channel. A single blended number hides which channel is actually pulling its weight and which one is quietly losing money.
A Simple Way to Track It Going Forward
CAC only stays useful if someone’s watching it, month to month, channel by channel. A spreadsheet with three columns is enough to start: spend, new patients, and source.
The source column is the one most practices skip, and it’s the one that matters most. Without it, a clinic can’t tell whether last month’s patients came from a Google ad, a review someone read the night before, or a friend who mentioned the practice at dinner.
Call tracking numbers and a simple “how did you hear about us” question at booking solve most of this without extra software. The goal isn’t a perfect system on day one. It’s a number that gets more accurate every month.
Frequently Asked Questions
Is Patient Acquisition Cost the Same as Cost Per Lead?
No. Cost per lead only measures enquiries, such as phone calls or form submissions. CAC measures what it cost to turn those enquiries into an actual booked, paying patient, which is usually a smaller and more expensive number.
Which Costs Are Included in Total Spend When Calculating CAC?
Ad spend, agency or freelancer fees, admin and reception time spent on enquiries, software and booking system costs, and any website or content work tied to attracting new patients.
How Often Should a Practice Calculate CAC?
Monthly at a minimum, with a rolling six-to-twelve-month view for channels like SEO that take longer to show results. A single month rarely tells the full picture.
Can a High CAC Still Be a Good Result?
Yes, if the patient’s lifetime value is high enough to justify it. A $300 acquisition cost is fine for a patient who returns for years. It’s a problem for a one-off, low-fee visit.
How Can a Practice Lower CAC Without Spending More?
By improving website conversion rate and building a consistent flow of recent reviews. Both increase the number of patients produced from the same ad spend, which lowers the cost per patient directly.
Get a Clear Picture of Your Own Numbers
Working out a practice’s true acquisition cost usually means pulling numbers out of an ads account, a website, a booking system, and a spreadsheet no one’s updated in months. Medical Marketing Co works with healthcare practices across Sydney, Melbourne, Brisbane, Gold Coast and Perth. If you’d like help putting your own numbers together, you can request a free consultation to see exactly where your acquisition spend is going.
