CPA Calculator
Calculate your Cost per Acquisition, plan budgets around a target CPA, or analyse CPA vs Customer Lifetime Value with LTV:CAC ratio. Works with any currency.
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How to Use This Calculator
Tab "Calculate CPA"
Enter your total marketing spend and the number of new customers acquired. The calculator divides spend by customers to give your CPA, plus a benchmark rating that tells you how your CPA compares to typical ranges across industries.
Tab "Target CPA"
Choose a planning mode: Budget → Max customers tells you how many customers you can acquire within a given budget at your target CPA. Target customers → Required budget tells you how much you need to spend to hit a specific customer count. Both modes include buffer recommendations.
Tab "CPA vs CLV"
Enter your CPA and Customer Lifetime Value (CLV). The calculator shows profit per customer, LTV:CAC ratio, and a rating from "Losing money" (below 1:1) to "Excellent" (above 5:1). This is the most important metric for determining whether your acquisition spend is sustainable.
The Formulas
CPA = Total Marketing Spend / New Customers Acquired
Max customers (from budget):
Max Customers = Budget / Target CPA
Required budget (from target customers):
Required Budget = Target Customers × Target CPA
Profit per customer:
Profit = Customer Lifetime Value (CLV) − CPA
LTV:CAC ratio:
LTV:CAC = CLV / CPA
LTV:CAC benchmarks:
Below 1:1 = Losing money on every customer
1–3:1 = Poor — unsustainable without improvement
3–5:1 = Healthy — sustainable growth
Above 5:1 = Excellent — room to invest more in acquisition
All calculations are universal and pre-tax. CPA benchmarks vary significantly by industry, channel, and business model. Results are estimates.
Worked Examples
Example 1 — E-commerce campaign: $10,000 spend, 200 customers
An online store runs a Facebook and Google Ads campaign spending $10,000 total and acquires 200 new paying customers.
At $50 per customer, this campaign is performing well for most B2C e-commerce verticals. The next step is comparing this CPA against Customer Lifetime Value to confirm profitability.
Example 2 — Budget planning: $25,000 budget, $40 target CPA
A marketing team has a $25,000 quarterly budget and wants to maintain a target CPA of $40 per customer.
With a $25,000 budget at $40 CPA, the team can acquire up to 625 customers. If they only need 500, the required budget would be $20,000 — leaving $5,000 for testing new channels.
Example 3 — CPA vs CLV: $50 CPA, $600 CLV
A SaaS company acquires customers at $50 each. The average customer stays for 3 years paying $200/year, making the Customer Lifetime Value $600.
A 12:1 LTV:CAC ratio is exceptional. This company has significant room to increase acquisition spend — they could triple their CPA to $150 and still maintain a healthy 4:1 ratio, potentially accelerating growth considerably.
Understanding CPA and Unit Economics
What Is CPA?
Cost per Acquisition (CPA) measures how much you spend in marketing and sales to acquire a single new customer. It is one of the most fundamental metrics in marketing — every business that spends money on growth needs to know its CPA.
CPA vs CAC
CPA typically refers to the cost of a specific campaign or channel. Customer Acquisition Cost (CAC) is broader — it includes all marketing and sales expenses (salaries, tools, overhead) divided by total new customers. CAC gives you the true, fully-loaded cost of acquiring a customer. This calculator uses both terms interchangeably in the LTV:CAC analysis.
Why LTV:CAC Matters More Than CPA Alone
A high CPA is not necessarily bad. If your customers are worth $10,000 over their lifetime, a $500 CPA is excellent (20:1 ratio). Conversely, a $5 CPA is terrible if customers only spend $3. The LTV:CAC ratio tells you whether acquisition spend is profitable. Below 1:1 means you lose money on every customer. The industry benchmark for healthy growth is 3:1 to 5:1.
How to Lower Your CPA
Focus on the highest-intent audiences. Improve landing page conversion rates. Test ad creative variations. Use retargeting. Build organic channels (SEO, content, referral programmes) that reduce marginal acquisition cost over time. And critically — measure CPA by channel, not just in aggregate, so you can shift budget from expensive channels to efficient ones.