The right Google Ads budget is the amount that buys enough clicks to produce a meaningful number of leads at a cost per lead your margins can support. Work it out from three numbers: what a new customer is worth to you, your close rate on leads, and the realistic cost per click in your market. Then run a test long enough to learn, and scale only what works.
Work backward from a customer
- Average profit from a new customer (first job or lifetime, your choice, but be consistent).
- Close rate: of 10 leads, how many become customers?
- Maximum affordable cost per lead = profit per customer × close rate × the share of profit you will spend to acquire.
Example: if a customer is worth $2,000 in profit, you close 25% of leads and you will spend up to half of the profit to acquire, your maximum cost per lead is $250.
Estimate the test budget
Use Google’s Keyword Planner and your own past data to estimate cost per click for your most important keywords. Divide your target cost per lead by your expected landing page conversion rate to see what you can afford per click. A test budget should buy enough clicks to produce at least 20 to 30 leads, or you will be judging on noise.
| Step | Example input | Result |
|---|---|---|
| Average first-year customer value | $3,000 | |
| Close rate from qualified lead | 25% | 4 qualified leads per customer |
| Affordable cost per customer | 30% of value | $900 |
| Target cost per qualified lead | $900 ÷ 4 | $225 |
| Landing page conversion rate | 8% | 12.5 clicks per lead |
| Implied max cost per click | $225 ÷ 12.5 | $18 |
| Leads wanted in the test | 20 | 20 × $225 = $4,500 over 90 days |
Where small budgets go wrong
- Spreading a small budget across too many keywords, locations and campaigns.
- Broad match with no negative keywords.
- Sending ads to the home page instead of a focused landing page.
- Judging on clicks or platform-reported conversions instead of leads and revenue in the CRM.
When to scale
Scale a campaign when cost per qualified lead is below your target for at least a month and your team can handle more leads without slowing response time. Increase budgets in steps, not all at once.
Frequently asked questions
Is there a minimum Google Ads budget?
Google has no minimum, but very small budgets rarely produce enough data to optimize. Concentrate spend on your highest-intent keywords.
How do agencies charge for Google Ads?
Commonly a monthly fee or a percentage of spend. We charge $2,000 a month minimum or 20% of ad spend, whichever is higher, and you pay the platform directly.
We manage Google Ads against a cost per booked job or qualified lead, reported from your CRM.
