The short answer
Patient acquisition cost (PAC or CAC) is marketing spend in a period divided by new patients from that marketing. Track it by channel with call tracking, UTM links, and Google Analytics key events. Judge the number against what a patient is worth in your practice over time, not against unsourced dollar tables from blogs.
What patient acquisition cost is
Patient acquisition cost answers a simple question: how much marketing did it take to bring in each new patient in a chosen period? Without that number, budget talks are guesses.
Count only new patients, not returning visits. Keep the same definition of "new" (for example, first completed exam) so January and June are comparable. Separating acquisition from retention keeps the growth engine honest.
The basic formula
PAC = marketing spend in the period ÷ new patients acquired from marketing in that period.
Illustration (not a benchmark): if you spent $3,500 across ads, sponsorships, and marketing software in March and recorded 18 new patients you can credit to marketing, PAC is about $194 for that month. Change either input and the story changes.
Decide what belongs in spend before you start: media, print, events, and marketing tools are common. Agency fees and staff hours are optional; include them only if you will include them every month.
Pro tip
Do not fold existing-patient revenue into the acquisition formula. Retention is a different metric. Mixing the two hides whether paid growth is paying for itself.
Track cost by channel
Overall PAC hides winners and losers. Split spend and new patients (or proxy key events) by channel.
- •Call tracking: unique numbers or dynamic numbers per campaign so phone leads get a source. SmileTrak reporting is one way we bundle calls with forms and ads; our call tracking guide covers the method.
- •UTM parameters: tag links with source, medium, and campaign so Analytics can credit the click path. Google documents custom campaign URLs for this.
- •Key events: mark booking submits, thank-you page views, or qualified form sends as key events so channels can be compared on the actions you care about.
- •Intake question: ask how the patient found you, but treat self-report as a check, not the only source of truth.
When Google Ads is linked and spending, the Analytics All channels performance report can show ads cost and cost per key event by channel. Google notes that Analytics and Ads may attribute the same key events differently, so expect small gaps.
For paid search specifically, Google Ads conversion tracking lets you bid and report on the same important actions. Our attribution guide explains why last click and data-driven views disagree.
Build your own baselines
There is no official Google dollar table for dental patient acquisition cost. Treat public "average CAC" blog posts as unverified. Useful comparisons live inside your own data:
- •This month versus the same month last year for each channel.
- •Paid search versus paid social versus organic-assisted new patients.
- •New office or new service lines versus mature ones (early months cost more while tracking and creative mature).
- •Cost per key event in Analytics versus new patients in the PMS, so you catch tracking gaps.
Organic search has no media invoice, but it still has content and site cost. Track those hours or retainers separately rather than calling organic "free" and then starving it.
Patient value versus acquisition cost
Acquisition cost only means something next to what a patient is worth to you over time. A simple illustration: average revenue per visit × visits per year × years the average patient stays. If that rough lifetime value is far above PAC, you have room to invest. If PAC approaches or exceeds near-term value and retention is weak, fix conversion or creative before raising spend.
There is no universal ratio published by Google that every practice must hit. Use your own retention and fee schedule. Improve value by keeping patients longer and completing needed care; improve PAC by raising conversion and cutting wasted media.
When referral rewards enter the picture, rules vary. Have your own attorney or dental board review any incentive before you launch it.
Ways to lower acquisition cost
- •Improve site conversion: clearer offers, faster pages, obvious booking. Same traffic, more patients, lower PAC.
- •Invest in organic local search and Google Business Profile so more patients arrive without a media invoice. See our SEO services.
- •Concentrate budget on channels with the best verified PAC; pause ones that stay expensive after a fair test.
- •Use remarketing carefully for people who already visited, following each platform's health and audience rules.
- •Ask for referrals and track them as their own source so unpaid growth is visible in the same report.
- •Fix tracking breaks quickly; broken tags inflate PAC by undercounting patients.
Retention still matters: high churn forces you to buy replacement patients even when acquisition looks efficient on paper.
Put tracking in place
- Write your spend definition and new-patient definition.
- Turn on call tracking, UTMs, and key events; train the front desk on the intake question.
- Collect a full month before making big budget moves.
- Review PAC by channel monthly beside conversion rate and patient value.
Put the numbers in the same monthly packet as the rest of your marketing KPIs so acquisition cost is a decision tool, not a one-off spreadsheet.
Sources
Frequently Asked Questions
What counts as marketing spend in the formula?
Include the paid media, sponsorships, print, and marketing software you can tie to acquiring new patients in that period. Decide in advance whether staff time and agency fees are in or out, and keep that definition consistent month to month so the number is comparable.
How do I track cost by channel?
Give each paid channel a measurable path: unique call numbers or call tracking, UTM-tagged links into Google Analytics, and key events for form submits or bookings. Divide that channel's spend by new patients (or key events) credited to it. Our attribution and call-tracking guides cover the plumbing.
Should I use Google's cost-per-key-event number as PAC?
It is a useful paid-media efficiency metric when Ads cost is linked into Analytics, but it is not the same as new-patient PAC unless your key event truly means a new patient started care. Use it alongside PMS new-patient counts, not instead of them.
Is there a universal good CAC number?
No public Google or Ads benchmark sets a correct dental CAC in dollars. Compare your channels to each other and to what a retained patient is worth in your practice over time. A number that looks high can still be fine if lifetime value and retention are strong.
How often should we review PAC?
Monthly is enough for most practices: same date range, same spend definition, same new-patient rules. Watch for sudden jumps that point to tracking breaks, auction changes, or a landing page problem rather than waiting for a quarterly surprise.