Clicks Needed = Target Leads / Landing Page Conversion Rate
Monthly Budget = Clicks Needed x Expected CPC
Daily Budget = Monthly Budget / 30
Cost Per Lead = Monthly Budget / Target Leads
Cost Per Customer = CPL / Close Rate
ROI = ((Deal Value - Cost Per Customer) / Cost Per Customer) x 100%
This calculator works backwards from a target: given a number of leads you want, it calculates the clicks and budget needed. It assumes your CPC and conversion rate hold steady as you scale, which is usually true until budget gets very large.
A worked example
Target 50 leads per month, $2.50 CPC, 10% conversion rate, 20% close rate, $5,000 deal value:
- Clicks needed = 50 / 0.10 = 500 clicks
- Monthly budget = 500 x $2.50 = $1,250
- Daily budget = $1,250 / 30 = $42 per day
- Cost per lead = $1,250 / 50 = $25
- Cost per customer = $25 / 0.20 = $125
- ROI = (($5,000 - $125) / $125) x 100 = 3,900%
A 3,900% ROI is extremely healthy. Every customer acquired for $125 generates $5,000 in value, a massive margin.
Google Ads CPC and conversion rate benchmarks
Expected CPC by keyword category (USD, average):
- Low-competition keywords: $0.25 to $0.75 (local services, niche industries)
- Mid-competition keywords: $1.00 to $3.00 (most small business categories)
- High-competition keywords: $3.00 to $8.00 (finance, law, insurance, technology)
- Very high-competition keywords: $5.00 to $20.00+ (crypto, gambling, attorney, rehab)
Landing page conversion rates for lead form pages typically run 5% to 20%. Higher rates come from good targeting, clear forms (first name + email only) and relevant messaging. Broad traffic often converts at 2% to 5%.
How to plan your first campaign
Start conservative, measure, then scale:
- Estimate CPC from keyword research. Use Google Keyword Planner (free in Ads Manager) to see estimated CPC for your keywords. Add 30% because the planner is often optimistic.
- Test conversion rate with a small budget. Start with $10 to $15 per day for a week. Measure actual landing page conversion rate, not a guess. Most first campaigns underestimate CPC and overestimate conversion rate.
- Calculate your maximum CPL. Use the cost-per-lead calculator to find your break-even CPL based on deal value and close rate. Do not spend more than 30% of that.
- Plan for learning phase. Google takes 3 to 7 days to optimize. Conversion tracking must be firing correctly or you will under-spend and miss your target.
Questions people ask
What is a realistic CPC for my keywords?
Use Google Keyword Planner (free in Google Ads) to see estimated CPC. Then add 20% to 30% because real performance is often higher. Test with a small budget to get actual data.
Should I plan based on target leads or actual conversion rate?
Always use historical conversion rate, not a goal. If you have not run this landing page before, run a test campaign at $10 to $15 per day for a week. Measure real conversion, then scale.
What if my actual CPC is higher than expected?
Lower bids, improve Quality Score (faster pages, more relevant ads), or pick less competitive keywords. Broad keywords cost more; long-tail keywords are cheaper. Start specific, expand as you optimize.
How long does it take to hit my lead target?
At $40 per day budget, you might hit 50 leads in 30 days, or 150 leads in 10 days, depending on conversion rate. Use this calculator to estimate the timeline, then add 20% buffer for learning phase.
Can I spend less and hit the target?
Only if you improve conversion rate (better landing page), lower CPC (better keywords or Quality Score), or increase deal value (higher close rate). Otherwise, lower spend means fewer leads, not the same leads cheaper.
Sources
Last reviewed 11 September 2026. Formulas and benchmarks are published on the page so you can check them. This tool gives estimates, not quotes.
