Marketing
CAC Calculator
Calculate the average customer acquisition spend required to acquire one new customer during the same measurement period.
Enter your values
Include the sales and marketing costs your business considers part of customer acquisition for the same measurement period.
First-time customers gained during the same reporting period.
Results
Customer acquisition cost
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Enter acquisition spend and new customers from the same period.
Customer acquisition spend
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The acquisition costs included for the period.
New customers acquired
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First-time customers acquired during the same period.
Results are estimates based on the values entered and are provided for general planning.
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Step by step
How to use the CAC
- Enter the Customer acquisition spend for the period — include every cost you want the figure to reflect.
- Enter the New customers acquired in the same period.
- Read the average cost per acquired customer.
Method
How to calculate CAC
CAC divides the acquisition spend you include by the new customers gained over the same period. The calculator does not decide which costs count; it reports the average cost per new customer for the scope you entered.
Formula
CAC = Customer acquisition spend ÷ New customers acquired during the same period
Assumptions
- The result is CAC for whatever cost scope you enter — paid media only, fully loaded, one channel, or blended across channels.
- Spend and new customers cover the same reporting period and the same scope.
- New customers must be a whole number of at least 1; CAC is never divided by zero.
Division retains full numeric precision. Currency displays two decimals; customer counts display as whole numbers.
How to interpret the result
CAC is the average acquisition cost for the scope you entered, not the cost of every individual customer. Compare it with consistently defined customer value and the time needed to recover acquisition spend. Keep channel, customer, and cost definitions consistent before comparing periods.
Choose a consistent CAC cost basis
CAC changes when the cost scope changes. A media-only calculation can help compare advertising channels, while a fully loaded blended CAC can include people, tools, agencies, creative work, and sales costs. Neither is automatically correct for every decision; the label and consistent method make the number useful.
Match spend and new customers to the same reporting window. Sales cycles can create timing differences, so monthly CAC may be volatile when costs occur before customers convert. Longer periods or cohort analysis can provide a more stable view.
Worked example
A business spends $18,000 on acquisition in March and gains 120 new customers in March. CAC = $18,000 ÷ 120 = $150.00 per new customer.
Why mismatched periods mislead
Suppose the $18,000 was a full quarter's spend and the quarter brought 120 new customers, but only March's 40 are entered. The result is $450.00 — three times the true quarterly figure of $150.00. The reverse mistake, one month of spend against a quarter of customers, makes CAC look a third of its real size.
The same applies to scope: channel spend divided by all new customers, or total spend divided by one channel's customers, gives a number that describes nothing real. Keep the cost definition, customer count, and period aligned.
CAC vs CPA, and blended vs channel-level CAC
CPA divides spend by any tracked action — a sign-up, trial, lead, or order — while CAC counts only newly acquired customers. When the action is a first purchase they can match; otherwise CPA is usually lower. The CPA Calculator handles the action-based version.
Channel-level CAC uses one channel's spend and the customers attributed to it, which helps compare channels. Blended CAC combines all included spend and all new customers, which describes the overall acquisition effort. Both are possible approaches; which suits you depends on the question you are answering.
Use CAC with value and payback
CAC alone does not show whether acquisition is profitable. Compare it with consistently defined customer value and estimate how quickly customer contribution recovers the acquisition cost. A lower CAC is not necessarily better if it brings customers with lower retention, purchase value, or margin.
The LTV Calculator estimates revenue per customer over their lifespan, and the LTV:CAC Ratio Calculator divides that value by CAC. Because that LTV is revenue-based, a ratio above 1 does not by itself mean acquisition is profitable.
CAC measures compared
Each version answers a different question; none is correct for every analysis.
| Measure | Formula | What it shows |
|---|---|---|
| Blended CAC | All included acquisition spend ÷ All new customers | Average acquisition cost across the selected business scope. |
| Paid CAC | Paid acquisition cost ÷ New customers attributed to paid channels | Acquisition efficiency for the included paid channels. |
| Revenue LTV to CAC | Revenue LTV ÷ CAC | Lifetime revenue relative to acquisition cost; not a profit ratio. |
Frequently asked questions
Which calculator do you need?
- Need the revenue side of the equation? Estimate customer value with the LTV Calculator.
- Want to compare value against acquisition cost directly? Use the LTV:CAC Ratio Calculator.
- Looking at ad-platform cost per acquisition specifically? Try the CPA Calculator.
- Not sure whether CAC or CPA fits your question? Read CAC vs CPA.
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