01
What is customer acquisition cost?
Customer acquisition cost, commonly shortened to CAC, shows the average marketing and sales expense used to acquire one new customer. It gives a small business, SaaS company, online store, or service business a consistent way to compare acquisition performance across periods or channels.
CAC is an average, not the exact cost of winning each customer. Every expense and every new customer in the calculation must belong to the same measurement period.
02
How to calculate CAC
Add attributable Marketing Costs and Sales Costs for the selected period. Divide that total by the number of new customers acquired during that same period.
Total Acquisition Costs = Marketing Costs + Sales Costs
Customer Acquisition Cost = Total Acquisition Costs ÷ New Customers Acquired
Marketing Cost per Customer = Marketing Costs ÷ New Customers Acquired
Sales Cost per Customer = Sales Costs ÷ New Customers Acquired
Use new customers rather than all orders, leads, visitors, or existing customers. A repeat purchase by an existing customer is not a new acquisition.
03
What costs should be included in CAC?
Marketing Costs can include paid advertising, campaigns, marketing tools, agency or contractor fees, attributable marketing team costs, content, and promotional expenses. Sales Costs can include sales salaries and commissions, sales tools, prospecting, demos, travel, and other costs attributable to acquiring customers.
Include only costs connected to acquisition for the period being measured. This calculator accepts aggregated totals; it does not decide accounting rules or how your business should allocate salaries, software, or shared overhead.
04
Marketing costs vs sales costs
Marketing costs generally create awareness and demand, while sales costs move prospects through conversations, demos, proposals, and closing. The boundary can vary between businesses, especially where the same team or software supports both activities.
Choose a documented, repeatable allocation method. The marketing and sales shares in the results show how the total acquisition spend is divided; they do not grade either category's effectiveness.
05
Why sales costs belong in CAC
A customer may first respond to marketing but still require prospecting, demos, follow-up, negotiation, or commissions before buying. Those attributable sales resources are part of the cost of acquiring the customer.
Calculating CAC from advertising or marketing spend alone can materially understate acquisition cost for a sales-led SaaS company, service business, or any company with a substantial sales process.
06
How to choose the correct measurement period
A month can suit a business with short buying cycles and stable activity. A quarter or year may be more representative when campaigns, seasonality, or sales cycles span several weeks. Use the same definition consistently when comparing periods.
Never divide one month's spending by customers from a different month. If acquisition has a material time lag, choose a longer aligned period or use a documented cohort method outside this simple aggregate calculation.
07
Customer acquisition and unit economics example
Suppose a business spends $14,000.00 on marketing and $10,000.00 on sales, acquiring 100 customers in the same period. Each customer brings $80.00 in monthly revenue, with a 75% gross margin and a 15-month estimated lifetime.
- Total acquisition spend: $24,000.00.
- CAC: $240.00 per new customer.
- Monthly gross profit per customer: $60.00.
- Gross-profit LTV: $900.00.
- LTV:CAC: 3.75×; CAC payback: 4.0 months.
- At a 3× target, maximum CAC is $300.00, leaving $60.00 per-customer headroom and a maximum acquisition spend of $30,000.00 for the same customer count.
08
How to interpret your CAC
There is no universal good CAC. An acceptable cost depends on customer lifetime value, gross margin, repeat purchases, churn, payback period, the business model, and the measurement method used.
A low CAC alone does not prove profitability. Compare CAC with the value and marginal profit a customer produces, how long that value takes to arrive, and whether the same cost definitions were used in every comparison.
09
Common CAC calculation mistakes
- Counting leads, visitors, orders, or existing customers instead of newly acquired customers.
- Counting repeat purchases as additional customer acquisitions.
- Combining costs from one period with customers from another.
- Omitting attributable sales salaries, commissions, tools, or other sales-process costs.
- Changing allocation rules between periods without documenting the change.
10
Limitations of a CAC calculation
Aggregate CAC can hide differences among channels, customer segments, locations, or cohorts. Allocation methods for salaries, software, and shared expenses can also differ between companies, so figures may not be directly comparable.
This calculator uses the aggregated costs you provide and does not define accounting treatment or model acquisition timing. Optional unit economics uses simplified, constant monthly revenue, margin, and lifetime assumptions; it is a reference for analysis, not a guarantee of efficiency.
11
How LTV, payback, and target CAC work
Here LTV is the gross-profit contribution expected from one customer: monthly revenue per customer × gross margin × estimated lifetime in months. It excludes CAC, overhead, taxes, and financing. For a more detailed model based on purchase value and frequency, use the Customer Lifetime Value Calculator.
LTV:CAC compares that estimated contribution with the acquisition cost calculated above. CAC payback divides CAC by monthly gross profit per customer, showing how many months of gross profit are needed to cover acquisition cost. If gross profit is zero, payback is unavailable.
Maximum CAC reverses a user-selected target: LTV ÷ target LTV:CAC ratio. Maximum acquisition spend multiplies that CAC by new customers. The five scenarios change CAC by −20%, −10%, 0%, +10%, and +20% while keeping customer economics fixed. A useful target depends on your margins, retention, capital constraints, growth stage, and business model.
12
Lifetime and churn assumptions
Choose Lifetime when you have a defensible estimate of active months. Choose Churn to estimate lifetime as 1 ÷ monthly customer churn rate. That churn method is a simplified steady-state approximation, not a precise forecast; zero churn cannot produce a finite lifetime.
Use the Churn Rate Calculator to estimate a consistent monthly churn rate and the Profit Margin Calculator to examine margin. For related decisions, explore the Business ROI Calculator, Pricing Calculator, and Break-even Calculator.
13
Frequently asked questions
What is customer acquisition cost?
Customer acquisition cost, or CAC, is the average attributable marketing and sales cost required to acquire one new customer during a defined period.
What is the formula for CAC?
Add Marketing Costs and Sales Costs for one period, then divide that Total Acquisition Cost by the number of new customers acquired in the same period.
Should sales costs be included in CAC?
Yes, when they are attributable to customer acquisition. Sales salaries and commissions, sales tools, prospecting, demos, and related travel can all contribute to winning new customers and should not be omitted simply because they are not advertising costs.
What marketing costs should be included?
Include acquisition-related paid advertising, campaigns, marketing tools, agency or contractor costs, attributable marketing team costs, content, and promotional expenses for the selected period. Apply one consistent allocation method.
Should I count leads or paying customers?
Count new customers, not leads, visitors, all orders, or existing customers. A repeat purchase by an existing customer is not another acquired customer.
What period should I use to calculate CAC?
Use a period long enough to represent your sales cycle and normal spending, such as a month, quarter, or year. Most importantly, every cost and every new customer in the calculation must come from that same period.
What happens when no new customers are acquired?
The form requires at least one new customer to calculate CAC, so zero new customers produces a validation error. The underlying calculation keeps per-customer values unavailable instead of dividing by zero.
Is a lower CAC always better?
No. A lower CAC does not by itself prove profitability or sustainable growth. Compare it with customer lifetime value, gross margin, repeat purchases, churn, payback period, your business model, and a consistent measurement method.
What is the difference between CAC and cost per lead?
Cost per lead divides relevant spending by the number of leads generated. CAC divides attributable marketing and sales spending by new customers acquired, so it measures a later outcome in the acquisition process.
Does CAC show whether a customer is profitable?
No. CAC measures average acquisition cost, not customer profitability. Profitability also depends on customer value, gross margin, retention, repeat purchases, servicing costs, and the time required to recover the acquisition spend.
Does changing Currency convert acquisition costs?
No. Currency changes the symbol and display formatting only. Enter marketing and sales costs in one consistent currency.
What is LTV:CAC?
LTV:CAC divides estimated gross-profit customer lifetime value by current customer acquisition cost. A zero CAC has no finite ratio.
How do you calculate customer lifetime value here?
Monthly revenue per customer times gross margin gives monthly gross profit. Multiply that by customer lifetime in months. The dedicated Customer Lifetime Value Calculator offers a deeper purchase-frequency model.
How do you calculate CAC payback period?
Divide CAC by monthly gross profit per customer. Payback is unavailable when monthly gross profit is zero or CAC is unavailable.
What is maximum CAC?
Maximum CAC is estimated LTV divided by the target LTV:CAC ratio you enter. It is a planning ceiling for your selected assumptions.
How do I calculate a target acquisition budget?
Multiply maximum CAC by the number of newly acquired customers in the CAC calculation. The result is maximum acquisition spend for that customer count.
How does gross margin affect CAC payback?
A lower gross margin reduces monthly gross profit, so the same CAC takes longer to recover. Revenue alone does not cover the direct costs of delivering the product or service.
Can I calculate LTV from churn?
Yes. The churn mode estimates lifetime as one divided by monthly customer churn rate, then multiplies by monthly gross profit. This is a simplified steady-state approximation, not a precise retention forecast. Churn must be above zero.
Is a 3:1 LTV:CAC ratio always good?
No. The appropriate target depends on margins, retention, cash constraints, growth stage, and the business model. The calculator uses the target you choose.
What happens if CAC is higher than maximum CAC?
Headroom becomes negative and the calculator shows how far current CAC is above the selected maximum. Review the target and the assumptions before making a budget decision.