What Is Customer Acquisition Cost (CAC)?

Customer Acquisition Cost (CAC) is your total acquisition spend divided by the number of new customers you acquired in a given period. It's the most-abused number in ecommerce, because both "acquisition spend" and "new customer" mean different things to different teams. Get the definitions wrong and your CAC can look 25 percent better than reality.

How CAC is calculated

CAC = total acquisition spend divided by new customers acquired.

"Acquisition spend" should include paid media, agency fees, creative production tied to performance, affiliate payouts, and paid influencer fees. "New customers" should mean genuine first-time buyers, measured at your customer relationship management system (CRM, like Shopify or Klaviyo), not at the ad platform.

A worked example

A DTC brand spends $80K on Meta, $20K on agency fees, $5K on creative production tied to performance, and $10K on affiliate payouts. Total acquisition spend: $115K. The brand's CRM shows 1,500 first-time buyers in the same period. CAC = $115K / 1,500 = $76.67. If the team had only counted Meta spend, they would have reported a misleading $53.33, hiding a third of the real cost.

What's a good CAC?

It depends on your vertical. 2026 blended CAC ranges:

• Beauty / personal care: $35 to $85
• Apparel: $48 to $110
• Footwear: $60 to $140
• Food and beverage DTC: $25 to $60 (subscription), $40 to $95 (one-time)
• Outdoor / hardgoods: $80 to $220
• Subscription consumables: $40 to $90
• Premium / luxury: $150 to $500+

The absolute number matters way less than two ratios: customer lifetime value to CAC (LTV:CAC), where you want 3:1 or better, and CAC payback period, which should be under 12 months on venture capital or under 6 months on working capital. See CAC calculator and 2026 benchmarks and average CAC by ecommerce vertical.

The most common mistake

Counting returning customers as new in the denominator. Meta and Google attribution credits returning customers as "acquired" the moment they click an ad. If 20 percent of your "new" customers are actually returning, your true CAC is 25 percent higher than what your dashboard reports. Fix: enforce the first-purchase definition at the CRM layer, not the ad-platform layer.

This is the short glossary version. For the full framework — blended vs paid vs fully loaded CAC, marginal CAC, max allowable CAC, DTC benchmarks from 35 brands, and the weekly decision rule — see our customer acquisition cost pillar.

Browse the full ecommerce finance glossary for every metric and money term a DTC operator needs.

Frequently Asked Questions

what should i actually include in my cac calculation?

Include paid media, agency fees, creative production tied to performance, affiliate payouts, and paid influencer fees. Don't include software, payroll, or brand-building campaigns not tied to acquisition. Most CFOs find their real CAC is 15 to 25 percent higher than the dashboard number because fees and creative are missing.

what's a good cac for ecommerce?

Depends on your vertical. See ranges above. The absolute number matters less than your LTV:CAC ratio (target 3:1 or better) and CAC payback period (under 12 months venture, under 6 months working capital).

cac vs cpa, what's the actual difference?

CPA is a platform-attributed metric, measured by Meta or Google. CAC is business-level, measured at the CRM. They almost always diverge because platform attribution overcounts. CPA is useful for channel diagnostics; CAC is the number a CFO actually trusts.