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Cost Per Acquisition (CPA) Calculator

Calculate CPA, ROI, and profitability for marketing campaigns to optimize customer acquisition spending and maximize returns.
Decision Context
Page-specific guidance for using this result in a real planning decision.

Use this calculator to estimate how much it costs to generate a conversion or customer from paid traffic and campaign spend.

It is useful for channel comparison, campaign evaluation, and deciding whether current conversion performance can support scale.

Compare CPA to contribution margin or customer value, otherwise you risk optimizing for a low headline number that still fails to create profitable outcomes.

Calculator
Enter your values

Customers acquired from this campaign

Analysis
Interpretation of the current calculator output

Enter values to see detailed analysis and insights.

How to Use

Step-by-step instructions
  1. 1Enter total marketing spend
  2. 2Input number of acquisitions/customers
  3. 3Add average order value per customer
  4. 4Review CPA, revenue, and ROI
  5. 5Optimize: lower CPA and/or increase AOV for better ROI

CPA & ROI Formulas

CPA measures the cost to acquire one customer. Lower CPA with positive ROI indicates efficient acquisition. CPA should be less than customer LTV.
CPA = Total Spend ÷ Acquisitions Revenue = Acquisitions × Average Order Value ROI = ((Revenue - Spend) ÷ Spend) × 100%

Variables:

CPACost Per Acquisition - spend per customer
ROIReturn on Investment percentage
AOVAverage Order Value per customer
LTVCustomer Lifetime Value (should exceed CPA)

Example

E-commerce Campaign Example

Inputs:

Total Spend:$10,000
Acquisitions:100 customers
Average Order Value:$50

Steps:

  1. 1.CPA = $10,000 ÷ 100 = $100/customer
  2. 2.Revenue = 100 × $50 = $5,000
  3. 3.ROI = (($5,000 - $10,000) ÷ $10,000) × 100 = -50%
  4. 4.Result: LOSING money - need AOV >$100 or lower CPA
Result:
$100 CPA with -50% ROI - unprofitable campaign

Frequently Asked Questions

What's a good CPA?

Depends on LTV. Good CPA = 1/3 of LTV or less (3:1 LTV:CPA ratio). E-commerce: $25-50, SaaS: $100-300, B2B: $200-500. Must be profitable from first purchase or have strong retention.

How do I reduce CPA?

Better targeting, improve ad copy, optimize landing pages, A/B test, retargeting, lookalike audiences, SEO/organic, referrals, conversion rate optimization, remove low-performing keywords/channels.

CPA vs CAC - what's the difference?

CPA = marketing spend only. CAC = marketing + sales + overhead. CAC is total cost. For e-commerce, they're similar. For B2B with sales teams, CAC is significantly higher than CPA.