Question
What does CAC mean?
CAC stands for customer acquisition cost. It measures the average spend needed to acquire one new customer.
Ecommerce
Use OmniCalc's CAC calculator to measure customer acquisition cost from total spend and the number of new customers acquired.
CAC calculator
Enter total acquisition spend and the number of new customers to calculate customer acquisition cost and a few quick efficiency views.
Why this result matters
A simple acquisition-economics calculator for ecommerce operators who need a quick customer acquisition cost baseline before connecting it to LTV or payback targets. Use the tool above to enter a few clear inputs and get a practical answer you can use right away.
This CAC calculator helps ecommerce teams estimate how much they are spending to acquire each new customer. It is useful because customer acquisition cost is one of the first metrics used to judge channel efficiency, payback, and whether growth is sustainable.
Formula and method
Customer acquisition cost is calculated by dividing total acquisition spend by the number of new customers acquired. The calculator also shows customers acquired per 1,000 spent and the implied spend required to acquire 100 customers at the same efficiency.
Example
If total acquisition spend is $3,600 and 90 new customers are acquired, the calculator reports a CAC of $40 and the implied spend required to acquire 100 customers at the same efficiency.
FAQ
Short answers to the questions people often ask before or after using the tool.
Question
CAC stands for customer acquisition cost. It measures the average spend needed to acquire one new customer.
Question
That depends on how your team defines acquisition cost. Many teams start with paid-media spend, while others include agency fees, creator spend, software, and salaries tied to acquisition.
Question
It gives a fast baseline for comparing channels and periods. It becomes even more useful when paired with LTV, payback period, or contribution margin metrics.
Related calculators
If the next question is close to this one, these are the best pages to open next.
Ecommerce
Use OmniCalc's ROAS calculator to measure return on ad spend, net return, ad cost share, and profit on ad spend from campaign revenue and ad spend.
Ecommerce
Use OmniCalc's break-even ROAS calculator to estimate the minimum ROAS needed to cover product, shipping, fulfillment, and payment costs before advertising loses money.
Ecommerce
Use OmniCalc's Shopify profit calculator to estimate per-order profit, total cost, margin, and payment-fee impact for a Shopify-style store.
Ecommerce
Use OmniCalc's subscription product calculator to estimate recurring revenue, gross profit, ARR, and a simple churn-based LTV from subscription price, service cost, subscribers, and churn.