Key terms
- Cost per click (CPC): what you pay when someone clicks your ad. Google's help center explains that your max. CPC is the most you are willing to pay, and the actual CPC you are charged is often less. The calculator uses your average actual CPC.
- Conversion rate: conversions ÷ ad interactions. Google's example is 50 conversions from 1,000 interactions, or 5%. Here, a conversion is a lead: a call, a form or a quote request.
- Cost per lead (CPL) = budget ÷ number of leads, which is also CPC ÷ conversion rate.
- Close rate: the share of leads that become paying customers. It is the number people forget most, and the one that changes everything.
- Cost per customer = budget ÷ customers won.
How to use the calculator
- Pick your goal: new customers or leads per month.
- Choose an industry preset to load the 2026 US averages for CPC and conversion rate, or enter your own.
- Enter your close rate: out of 10 leads, how many do you win?
- Add your average sale value to estimate revenue and ROAS.
- Compare the cost per customer with the profit one customer brings you. If it is higher, fix the offer, the landing page or the goal before touching the budget.
The 2026 benchmarks behind the presets
The presets come from the LocaliQ and WordStream 2026 Search Advertising Benchmarks, last updated June 1, 2026 and built from thousands of customer campaigns on Google Ads and Microsoft Ads. Across industries, the average click costs $5.42, the average Google Ads conversion rate is 8.18% and the average lead costs $66.69. A few local service categories:
| Industry | Avg. CPC | Avg. conv. rate | Avg. cost per lead |
|---|---|---|---|
| Attorneys & Legal Services | $9.87 | 5.55% | $131.63 |
| Home & Home Improvement | $8.33 | 8.05% | $90.92 |
| Dentists & Dental Services | $8.00 | 10.67% | $72.97 |
| Personal Services | $7.17 | 12.34% | $54.60 |
| Business Services | $5.87 | 4.85% | $93.69 |
| Automotive Repair, Service & Parts | $4.35 | 15.51% | $29.96 |
The report averages each metric separately, so CPC ÷ conversion rate will not exactly match its cost per lead. Treat these numbers as starting points, not quotes: your city, your keywords and your landing page can move them a lot in either direction.
Worked example
A remodeling company wants 10 new jobs a month, wins 1 lead in 4 and starts from the home improvement averages ($8.33 per click, 8.05% conversion rate):
- Leads needed: 10 ÷ 25% = 40.
- Clicks needed: 40 ÷ 8.05% = 496.9, rounded up to 497.
- Monthly budget: 497 × $8.33 = $4,140.
- Average daily budget: $4,140 ÷ 30.4 = $136.18.
- Cost per lead: $4,140 ÷ 40 = $103.50. Cost per customer: $4,140 ÷ 10 = $414.
- At a $3,000 average job: $30,000 in revenue, a ROAS of 7.25.
The close rate and job value here are examples, not benchmarks. The spread between trades is huge: on accounts we manage, a plumbing company paid €1.62 per conversion while a premium roofing market ran at €269 per qualified lead, and both were profitable. Run the numbers with your own data.
How Google spends your daily budget
Google Ads works with an average daily budget. If you plan monthly, Google's help center says to divide that number by 30.4, which is exactly what the calculator does. Two official rules to know:
- On a given day, a campaign can spend up to twice its average daily budget to take advantage of traffic swings: up to $272.37 on a $136.18 budget.
- Over a month, it will not spend more than 30.4 times that average daily budget. If delivery goes past your limits, you never pay more than your spending limits.
In practice, do not panic over one expensive Tuesday: judge spend over the month, and avoid changing the budget every day so your campaigns can settle.
How much should you spend on Google Ads?
The right question is not what others spend, but what a customer costs you and how many you need. The calculator starts there. Then add two guardrails:
- A floor. Smart Bidding needs data: Google's Target ROAS strategy, for example, requires at least 15 conversions in the past 30 days on Search. A budget that buys a handful of leads a month gives the algorithm little to learn from. We start client accounts at €900 a month in ad spend, roughly €30 a day: an agency stance, not a Google rule.
- A profitability ceiling. Cost per customer must stay below the profit a customer brings in; otherwise more budget only loses money faster. Check it with our ROAS calculator.
For the full picture, management fees included, read how much Google Ads costs a small business.
Common mistakes
- Taking Keyword Planner CPCs at face value: they are bid estimates, not your actual cost.
- Forgetting the close rate: 50 leads are not 50 customers.
- Spreading a small budget over too many campaigns, keywords or locations.
- Judging after one week, when lead volume usually settles around the 30-day mark.
- Mixing up ad spend, paid to Google, with management fees, paid to your agency.
- Sending clicks to a page that does not convert: doubling the conversion rate halves the cost per lead.
Prefer to hand it off? Here is how we manage Google Ads.
