Short answer
Most single-practice Google Ads campaigns need a minimum of roughly $1,500 to $3,000 a month in media spend to generate a meaningful, statistically useful lead flow, separate from any management fee. Highly competitive metro categories or high-value services like cosmetic procedures often need more to compete effectively.
Why there's a practical minimum
Below a certain spend level, a campaign simply doesn't generate enough clicks and conversions to tell you anything reliable, you can't tell whether a keyword genuinely underperforms or whether it just hasn't had enough traffic yet to judge fairly. This is why very small budgets, a few hundred dollars a month, for example, often produce disappointing results regardless of how well the campaign is built: there isn't enough volume to optimise against.
How competition and service value change the number
A general dental check-up in a moderately competitive suburb might cost a few dollars per click, while a competitive cosmetic dentistry keyword in inner Sydney can cost significantly more. Higher cost per click isn't necessarily bad if the resulting patient is worth considerably more, an implant case or a cosmetic procedure justifies a higher acquisition cost than a routine check-up, which is why budget should reflect the value of what you're promoting, not just a flat percentage of revenue.
Separating media spend from management fees
Ad spend and management fees are different things and should be budgeted separately. Media spend goes directly to Google; the management fee covers strategy, campaign build and ongoing optimisation. An agency that bundles these into one number in a way that obscures how much is actually going to media, versus how much is being kept as margin, makes it hard to judge whether you're getting good value.
How to set an initial number if you're starting from scratch
Start with a realistic minimum for your market, typically $1,500 to $2,000 a month for a moderately competitive single-location practice, run it properly for at least six to eight weeks with proper call tracking in place, and then adjust based on actual cost per booked patient rather than cost per click alone. Increasing budget makes sense once you can see the campaign is producing patients at an acceptable cost; increasing it before that just accelerates uncertain spending.
What happens if your budget is genuinely too small
Below a certain spend threshold, which varies by market but is often somewhere under 800 to 1,000 dollars a month, campaigns frequently struggle to exit Google's learning phase properly, meaning the algorithm never gets enough data to optimise delivery effectively. The result is often a frustratingly inconsistent pattern of good days and bad days that never quite stabilises into a reliable, judgable trend. If your realistic budget sits below this level, it is often more effective to concentrate that spend narrowly on your single highest-value service rather than spreading it thinly across several campaigns that individually never gather enough data to perform well.
How seasonal demand should factor into your budget planning
Many healthcare services see genuine seasonal variation, cosmetic procedures often peak ahead of summer, some allied health categories see demand shifts around the start of the school year or new health insurance periods, and building this into your budget planning avoids either overspending during naturally quiet periods or under-investing right before a period of higher genuine demand. Reviewing your own historical enquiry patterns, even informally, over a full year gives a more reliable guide to this than assuming demand is flat throughout the year.