Raw leads = ad spend ÷ cost per raw lead
Qualified = raw leads × qualification %
Booked = qualified × booking % · Attended = booked × show-up % · Jobs = attended × close %
Revenue = jobs × average job revenue · Gross profit = revenue × gross margin %
Total marketing cost = ad spend + other fees · Contribution = gross profit − total marketing cost
Worked example with the starting numbers: $1,500 spend at $75 per raw lead is 20 raw leads. 60% qualify (12), half of those book (6), 80% of booked appointments happen (4.8), and a quarter of attended appointments close (1.2 jobs). At $12,000 per job that is $14,400 in revenue and $4,320 in gross profit. Subtract $1,800 of total marketing cost and the contribution is $2,520 — before overhead and tax. Decimal counts are averages across months, not a promise of exact jobs.