Max CPA Calculator
CPA (cost per acquisition) is what you pay for each conversion. For ecommerce, max CPA is your cap per purchase. For lead gen (toggle above), the result is max cost per lead — divide by close rate for a CRM closed-deal cap. Spend above your cap and every acquisition loses money.
Revenue per sale, before ad costs
Optional: shipping, payment fees, etc.
Maximum affordable CPA
The formula
Max acquisition cost = (value × margin%) − fixed cost
Ecommerce: value is AOV and fixed cost is per order — this is your max CPA per purchase. Lead gen: use customer value × close rate as value and fixed cost per lead — the result is max cost per lead. That same contribution is the profit you keep before ad spend.