Ecommerce Customer Acquisition Cost Calculator
Calculate blended CAC, ad-only CAC, cost per lead, and acquisition efficiency from your ecommerce marketing costs.
Acquisition cost detail
Optional funnel metrics
Measure what it really costs to acquire a new customer
Use this calculator to go beyond ad-platform CPA and calculate customer acquisition cost from the full set of acquisition expenses.
Advertising spend is only one part of acquisition cost. Agencies, creative production, software, sales and marketing labor, commissions, and other costs can materially increase the true cost of winning a customer.
The calculator shows both ad-only CAC and blended CAC so you can see the difference between media efficiency and the full acquisition economics of the business.
Use costs and new-customer counts from the same measurement period. Mixing monthly spend with quarterly customer counts will produce a misleading CAC.
How customer acquisition cost is calculated
The calculator combines acquisition expenses and divides them by first-time customers acquired during the same period.
Add advertising spend
Start with the paid media spend used to acquire new customers.
Add non-media acquisition costs
Agency fees, creative production, tools, labor, commissions, and other acquisition expenses are added to advertising spend.
Divide by new customers
Total acquisition spend is divided by first-time customers acquired to calculate blended CAC.
Add funnel context if available
Optional lead and new-customer revenue inputs add cost per lead, conversion rate, and revenue-to-acquisition-spend metrics.
Example customer acquisition cost calculation
Suppose an ecommerce business measures one month of acquisition activity:
Total acquisition spend is $6,000. Blended CAC is $30 per new customer, while ad-only CAC is $20. Cost per lead is $6 and lead-to-customer conversion is 20%. New-customer revenue is 2.0 times total acquisition spend.
What each result means
The most important distinction is between the acquisition cost visible in an ad platform and the full cost carried by the business.
Blended CAC
Total acquisition spend divided by new customers acquired. This is the broadest acquisition-cost measure in the calculator.
Ad-only CAC
Advertising spend divided by new customers. It isolates paid-media efficiency from the rest of the acquisition cost structure.
Non-ad cost per customer
Agency, creative, tools, labor, commissions, and other entered costs allocated across each new customer.
Cost per lead
Total acquisition spend divided by leads generated when a lead count is entered.
Lead-to-customer conversion rate
The share of leads that became new customers during the measurement period.
New-customer revenue multiple
Revenue generated by new customers divided by total acquisition spend. This is a revenue efficiency metric, not a profit metric.
Customer acquisition cost questions
Common questions about measuring ecommerce CAC consistently.
What costs should be included in CAC?
Include the costs directly associated with acquiring new customers for the period you are measuring. Depending on your business, this can include media spend, agencies, creative, acquisition software, sales and marketing labor, commissions, and other acquisition expenses.
What is the difference between CAC and CPA?
CPA often refers to the cost of a specific advertising conversion and may come directly from an ad platform. CAC usually measures the broader business cost of acquiring a new paying customer.
Should retention or customer support costs be included in CAC?
Normally no. CAC is focused on acquiring the customer. Retention, service, and fulfillment costs are usually analyzed separately unless they are specifically part of the acquisition process.
Why should I compare blended CAC with ad-only CAC?
The difference shows how much non-media acquisition infrastructure adds to the apparent cost reported by advertising platforms.
How do I know whether my CAC is good?
CAC needs to be compared with the profit or lifetime value generated by the customer. A CAC number by itself does not show whether acquisition is economically sustainable.