If you are spending £500 or more a month on Google Ads and you are not certain whether it is working, you are not alone. Most clinic owners in that position can tell you how much they are spending. Almost none can tell you the cost per new patient it produced last month.
That gap is the problem. Clicks and impressions are not results. They are activity. The only question that matters is: for every pound you spend, how many pounds does a new patient bring back?
Table of Contents
- Why clicks and impressions mislead you
- The three numbers that actually matter
- How to calculate your cost per new patient
- What a good cost per new patient looks like
- How to calculate your return on ad spend
- The break-even test every clinic should run
- Why your Google Ads dashboard may be lying to you
- The landing page problem most clinics miss
- What to do if your ads are not making money
- Run your own numbers
Why clicks and impressions mislead you
A Google Ads agency will typically report on impressions, clicks, and click-through rate. These numbers are easy to produce, look like progress, and mean almost nothing on their own.
Impressions tell you how many times your ad appeared on a screen. They do not tell you whether the person was relevant, interested, or anywhere near your clinic.
Clicks tell you how many times someone tapped your ad. They do not tell you whether those people booked, enquired, or disappeared immediately.
Click-through rate tells you the percentage of impressions that became clicks. A high click-through rate on the wrong keywords is expensive and useless.
None of these numbers tell you whether your ad spend produced a single new patient. Yet they are what most clinics see every month in their reporting.
The three numbers that actually matter
Strip away everything else. The only three numbers worth tracking are:
1. Cost per click (CPC) How much you pay each time someone clicks your ad. This varies by service and location, from around £1.50 for ear wax removal to £12 or more for weight loss or aesthetics in competitive cities.
2. Cost per new patient How much you spent to bring in one new booked patient. This is your CPC divided by the combined rate of people who clicked, then enquired, then booked.
3. Patient lifetime value (LTV) How much revenue a new patient generates over the full course of their relationship with your clinic. Not just their first appointment. All of them.
If your cost per new patient is lower than your patient lifetime value, your ads are working. If it is higher, every new patient is costing you money to acquire.
How to calculate your cost per new patient
You need three figures from your own data:
- Monthly ad spend — what you actually paid Google
- Click-to-lead rate — the percentage of people who clicked your ad and then made an enquiry or filled in a form
- Lead-to-booking rate — the percentage of enquiries that became confirmed appointments
The calculation runs like this:
Leads per month = (monthly spend ÷ CPC) × click-to-lead rate
New patients per month = leads per month × lead-to-booking rate
Cost per new patient = monthly spend ÷ new patients per month
As a worked example: a clinic spending £800 a month on a service with a £4 average CPC gets 200 clicks. If 25% of those clicks become leads, that is 50 leads. If 55% of those leads book, that is 27 new patients. Cost per new patient: £29.60.
Whether £29.60 is good depends entirely on what that patient is worth. For an ear wax appointment worth £65, a £30 acquisition cost is slim. For a weight loss patient on a 6-month programme worth £900, it is outstanding.
What a good cost per new patient looks like
There is no universal benchmark, because it depends on your service values and how long patients stay. A rough guide by service:
| Service | Typical appointment value | Defensible cost per new patient |
|---|---|---|
| Ear wax removal | £55 to £75 | Up to £25 |
| Travel vaccines | £80 to £200 | Up to £40 |
| Weight loss (GLP-1 programme) | £150 to £300/month | Up to £100 |
| Aesthetics (Botox, filler) | £200 to £500 | Up to £80 |
| Private GP consultation | £100 to £200 | Up to £60 |
| ADHD assessment | £500 to £1,500 | Up to £200 |
These are starting points, not hard rules. A clinic with strong rebooking rates can afford a higher acquisition cost because each patient is worth more over time. A clinic with low retention needs a tighter cost to stay profitable.
How to calculate your return on ad spend
Return on ad spend (ROAS) is the ratio of revenue generated to money spent on ads.
ROAS = revenue from new patients ÷ ad spend
If your ads produced 27 new patients at an average first-appointment value of £75, the immediate revenue is £2,025 from an £800 spend. That is a ROAS of 2.53, meaning you got £2.53 back for every £1 you spent.
But first-appointment revenue understates the real return. Most patients rebook. Some come back monthly. The true return only appears when you factor in lifetime value.
A weight loss patient spending £180 a month across a 6-month programme generates £1,080. If your ads brought in 10 of those patients, the revenue from one month of spend is £10,800 against an £800 budget. That is a ROAS of 13.5.
The clinic that only measures the first appointment and concludes ads are not working may be switching off the most profitable channel they have.
The break-even test every clinic should run
Before you increase your budget or cut it, run the break-even test. It tells you the minimum number of new patients your ads must produce each month to cover their own cost.
Break-even patients = monthly spend ÷ average appointment value
A clinic spending £600 a month with an average appointment value of £85 needs to bring in at least 8 new patients to break even on that first visit. Anything above 8 is profit.
Now work backwards from there:
- 8 patients required
- At a 55% lead-to-booking rate, you need roughly 15 leads
- At a 25% click-to-lead rate, you need roughly 60 clicks
- At a £4 CPC, 60 clicks costs £240
If your budget is £600 and you only need £240 in clicks to break even, the maths says ads should work. But if your click-to-lead rate is 8% rather than 25%, you need 190 clicks to hit 15 leads, which costs £760 and immediately puts you in the red.
The break-even test reveals exactly which part of your funnel needs fixing. Often it is not the keywords or the budget. It is the conversion rate between click and enquiry.
Why your Google Ads dashboard may be lying to you
Google Ads has a concept called conversions. If you have not set up conversion tracking correctly, Google counts whatever it can find as a conversion: page visits, time on site, even just loading the landing page.
This means a campaign reporting 120 conversions may have produced zero actual bookings. The dashboard looks healthy. Your diary is not moving.
The only conversions that matter for a clinic are:
- A completed booking form
- A phone call from the ad (tracked via call tracking)
- A completed contact or enquiry form
If your Google Ads account does not have these set up as specific conversion events, every "conversion" number you have been given is meaningless. You have been paying for data that does not reflect whether your ads actually work.
The landing page problem most clinics miss
The most common reason clinic ads underperform has nothing to do with the keywords, the targeting, or the budget. It is the page the ad sends people to.
Google Ads can put your ad in front of the right person at exactly the right moment. If that person clicks and arrives at your homepage, a generic services page, or any page without a clear booking option above the fold, most of them leave within 10 seconds.
The standard conversion rate for a well-built landing page in healthcare is 10 to 20% of clicks becoming enquiries. For a poorly built landing page, it drops to 2 to 5%. That difference more than triples your cost per new patient.
A landing page that converts needs four things:
- The exact service the ad mentioned in the headline. If the ad says "Ear Wax Removal Manchester", the page must say the same.
- A booking option immediately visible without scrolling.
- A price or price range, so patients do not click away to find it elsewhere.
- A fast load time. On mobile, a page that takes more than 3 seconds to load loses more than 50% of visitors before they see anything.
If your ads are sending traffic to your homepage, fixing that one thing will have a bigger impact on your cost per new patient than any keyword change.
What to do if your ads are not making money
If you run the numbers and they do not stack up, there are three likely causes:
Your click-to-lead rate is below 10%. The landing page is not converting. Fix the page before touching the budget.
Your lead-to-booking rate is below 40%. Leads are enquiring but not booking. This is often a follow-up speed problem. A lead who does not hear back within an hour is likely to book with the next clinic they find.
Your CPC is too high relative to your appointment value. You are paying too much per click for a service that does not justify the spend. Either reduce bids, tighten your keyword targeting to reduce irrelevant clicks, or shift budget to a higher-value service.
Increasing your monthly budget without addressing any of these fixes only amplifies the problem.
Run your own numbers
The calculations above are straightforward, but the results look very different depending on your specific CPC, your services, and how well your landing pages convert.
Our free Google Ads ROI calculator lets you enter your actual spend, your CPC, your conversion rates, and your appointment values to get a clear picture of your cost per patient, your break-even point, and whether your current budget is producing a return.
