Total spend for this channel/period
Calls, form fills, or inquiries
% of leads that become customers
Revenue minus cost of service delivery
Cost Per Lead
Per inquiry/call
$50.00
Cost Per Customer
After close rate
$200.00
Max Affordable CPL
Profit break-even
$62.50
Gross Profit
50% of revenue
$2500.00
Net Profit
After ad spend
$500.00
At $50.00 per lead with a 25% close rate, you'll acquire 10.0 customers generating $5,000 in revenue. After your 50% margin and ad spend, you net $500.00 in profit.
Understanding Cost Per Lead
Cost per lead (CPL) is a fundamental metric for measuring marketing efficiency. It tells you what you're paying to get someone interested enough to contact you.
CPL = Marketing Spend ÷ Number of Leads
Example: $2,000 spent ÷ 40 leads = $50 CPL
Cost per Customer = CPL ÷ Close Rate
Example: $50 CPL ÷ 25% close rate = $200 cost per customer
Max Affordable CPL = AOV × Gross Margin × Close Rate
Example: $500 × 50% margin × 25% = $62.50 max profitable CPL
Revenue vs. Profit: The critical difference
CPL Benchmarks for DFW Service Businesses
Typical CPL by Industry (Google Ads)
HVAC
$45-150
Emergency higher
Plumbing
$35-120
Service-dependent
Roofing
$60-200
Storm season varies
Dental
$25-80
New patient focus
Legal
$150-500+
Case type matters
Med Spa
$30-100
Offer-dependent
Lead quality matters more than lead cost
Reducing Your CPL
Improve Conversion Rates
Better landing pages, faster load times, clearer CTAs. Same clicks, more leads.
Tighten Targeting
Eliminate wasted clicks on out-of-area or low-intent searches. Geographic and negative keywords.
Invest in Organic
SEO and Google Maps leads have lower long-term CPL. They compound over time.
Build Referrals
Referral leads often cost near-zero. Great service and review generation pay dividends.
Frequently Asked Questions
Related Tools
CPC Calculator
Calculate your cost per click and find what CPC you can afford based on your close rate and margins.
ROAS Calculator
Calculate your return on ad spend and break-even point. Find out if your Google Ads or paid campaigns are actually profitable.
Revenue Per Lead
Calculate the true value of each inbound lead based on your average job value and close rate.