Growth metrics
Customer acquisition cost in ecommerce
CAC is more useful when it is connected to margin, payback, and customer quality instead of treated as a standalone number.
8 min read
Define the CAC you are using
Blended CAC spreads total acquisition spend across new customers. Channel CAC looks at the cost of customers from a specific source.
- Blended CAC for overall efficiency
- Channel CAC for budget allocation
- Campaign CAC for tactical diagnosis
Connect CAC to contribution margin
A low CAC is not automatically good if the customers buy low-margin products or return frequently.
- Measure first-order profit
- Track repeat purchase contribution
- Compare CAC payback by channel
Use CAC in operating reviews
CAC belongs in the same conversation as profit, LTV, product mix, and channel quality.
- Review CAC alongside net margin
- Watch acquisition offers that reduce profit
- Segment new and returning customer performance
Put it to work
Turn the guide into a profit operating view.
MarginCore connects ecommerce sales, ad spend, COGS, fees, refunds, and operational adjustments so teams can review profit with less spreadsheet cleanup.