🎯 CPA Calculator — Cost per Acquisition
Calculate cost per acquisition (CPA) for any marketing campaign and compare it to customer lifetime value.
CPA vs CAC vs ROAS
CPA = total spend / acquisitions (any conversion). CAC = spend to acquire a paying customer. Max CPA = LTV × Gross Margin — the most you can spend per acquisition and break even.
CPA vs CAC: Which Metric Are You Tracking?
CPA (Cost per Acquisition) and CAC (Customer Acquisition Cost) are often confused. CPA measures cost per specific conversion action — which could be a lead, a trial signup, an email subscription, or a purchase. CAC measures the total cost to acquire a paying customer, including all sales and marketing costs across all channels. A marketing campaign might have a CPA of $12 per lead, but the CAC for the resulting customers might be $85 when accounting for sales team costs and the 14% lead-to-customer conversion rate.
Break-Even CPA: The Number That Actually Matters
Break-Even CPA = Revenue per Customer × Gross Margin. If your average order value is $120 and gross margin is 55%, your break-even CPA is $66. Spending more than $66 to acquire each customer destroys value. Most advertisers also want a 3:1 LTV:CAC ratio, which means a target CPA of LTV ÷ 3. With a $200 LTV, target CPA = $67.
People Also Ask
It varies entirely by industry and business model. eCommerce: $10–$50. B2B SaaS: $100–$500. Financial services leads: $50–$300. Legal leads: $100–$1,000+. Real estate: $20–$150. What matters is not the absolute number but whether CPA is below your break-even point and whether LTV:CPA ratio is healthy (target 3:1 minimum).
Improve CTR (lower-funnel keywords, stronger ad copy), improve landing page conversion rate (clearer CTA, faster load, social proof), tighten audience targeting (exclude irrelevant demographics, use lookalike audiences), implement negative keywords to eliminate wasted spend, and test different offer structures (free trial vs demo vs direct purchase).
CPL (Cost per Lead) is a subset of CPA where the conversion action is specifically a lead — a form fill, phone call, or email signup. CPA is broader: it can apply to any conversion action, including purchases. CPL is used when the sale happens later offline (B2B, real estate, financial services), while CPA typically refers to direct online purchase conversions.