E-commerce CAC Calculator - Customer Acquisition Cost for Online Stores
E-commerce CAC is sales and marketing acquisition spend per new paying customer. Compare categories, order values, and channels separately. Include delivery costs in customer value and payback, and review and cash needs before judging a campaign by its LTV:CAC ratio.
E-commerce CAC reference points
E-commerce acquisition channels
Meta Ads (Facebook/Instagram)
Record attribution methods and compare first-time customer acquisition.
Google Shopping
Compare acquisition cost by product category and margin.
Email Marketing
Separate new-customer acquisition from repeat-purchase campaigns.
Influencer Marketing
Include fees and production costs; use a consistent attribution method.
SEO / Organic Search
Include the work needed to create and maintain content.
Referral / Word of Mouth
Measure customer value alongside program costs.
E-commerce CAC Measurement Tips
Track new customer CAC separately from returning customer marketing costs. Acquisition and retention campaigns have fundamentally different economics and should be measured independently.
Account for changes in attribution when comparing campaigns over time. Record the measurement method and its limits; post-purchase surveys or media mix models can provide additional evidence but do not guarantee exact CAC estimates.
Consider contribution margin, not just gross margin. E-commerce has many variable costs beyond COGS: shipping, returns, payment processing, and fulfillment. True profitability requires accounting for all of these.
Segment CAC by product category or customer cohort. Your hero product that drives acquisition may have very different CAC than your full catalog. Understanding this helps optimize your acquisition mix.
Calculate CAC payback period in months, not just as a ratio. If a customer makes 2 purchases per year at $75 AOV with 40% margin, monthly gross profit is $5. A $50 CAC means a 10-month payback period, under a steady-purchase assumption; actual purchases may arrive unevenly.
Calculate Your E-commerce CAC
Use our free CAC calculator with your actual marketing and sales numbers. Includes a cost-category breakdown and optional LTV:CAC and payback inputs.
Open CAC CalculatorE-commerce CAC: Frequently Asked Questions
Compare CAC with the gross profit you expect from a customer. First-order gross profit that covers CAC recovers acquisition cost, but other operating costs may remain. If you rely on repeat purchases, check cohort evidence, payback, and cash needs before increasing spend.
Apple’s App Tracking Transparency requires permission for tracking across other companies’ apps and websites from iOS 14.5 onward. That changes which tracking data can be collected. A change in reported CAC may reflect measurement as well as campaign performance; do not apply a universal percentage increase.
Always calculate CAC per new customer, not per order. Your acquisition spend brings in a customer who may make multiple purchases over their lifetime. If you calculate per-order CAC and count repeat purchases in your denominator, you will dramatically underestimate your true acquisition cost. Track new customer CAC using only first-time buyers in the denominator.
At fixed spend and traffic, improving conversion to new customers lowers CAC. Test landing pages, creative, targeting, referrals, and organic search to find what works for your audience. Track email and SMS spending on repeat purchases separately from new-customer acquisition.