Customer Acquisition Cost Calculator – CAC Calculator
Results are estimates based on the values you enter. Recheck your inputs and assumptions before using the output for decisions.
Divide an amount by units to find a per-unit rate.
Customer Acquisition Cost Calculator – CAC Calculator
Free online customer acquisition cost calculator to estimate how much marketing spend is required to acquire one new customer. This calculator is useful for startup founders, marketers, SaaS teams, ecommerce businesses, growth managers, agency analysts, and business owners who want to understand whether customer growth is becoming more or less efficient over time. Customer acquisition cost, often called CAC, is one of the most practical growth metrics because it connects marketing investment directly to customer volume.
The calculator works with two simple inputs: marketing spend and new customers. Marketing spend means the total amount spent on paid marketing, campaigns, channels, or growth activity during the selected period. New customers means the total number of customers acquired during that same period. Once those values are entered, the calculator shows CAC and the projected spend required for 100 customers. This makes it easier to compare channels, estimate scaling budgets, and review whether customer acquisition cost fits the economics of the business.
The formula of customer acquisition cost
Customer acquisition cost (CAC) = Marketing spend / New customers
Projected spend for 100 customers = CAC x 100
Here marketing spend means the total cost of acquiring customers for the selected period, and new customers means the number of customers gained from that effort. The CAC result shows the average amount spent to acquire one new customer.
Solved Example
Example 1: Find the CAC if marketing spend is $5,000 and new customers are 100.
Solve: CAC = 5000 / 100 = $50.00
Projected spend for 100 customers = 50 x 100 = $5,000
Example 2: Find the result if marketing spend is $12,000 and new customers are 240.
Solve: CAC = 12000 / 240 = $50.00
Projected spend for 100 customers = 50 x 100 = $5,000
Example 3: Find the result if marketing spend is $7,500 and new customers are 125.
Solve: CAC = 7500 / 125 = $60.00
Projected spend for 100 customers = 60 x 100 = $6,000
Table of CAC calculator
| Marketing Spend | New Customers | CAC | Spend for 100 Customers |
|---|---|---|---|
| $5,000 | 100 | $50.00 | $5,000 |
| $7,500 | 125 | $60.00 | $6,000 |
| $12,000 | 240 | $50.00 | $5,000 |
| $20,000 | 320 | $62.50 | $6,250 |
How to use this customer acquisition cost calculator
Enter the total marketing spend in the proper input field. After that, enter the number of new customers acquired during the same period. Then click the calculate button. The calculator will show CAC and the projected spend for 100 customers in the result box. Make sure both numbers come from the same channel mix, business unit, and time range so the output stays meaningful.
This calculator is useful when comparing customer acquisition efficiency across campaigns, channels, months, or growth strategies. If CAC is rising, the business may be facing more competition, weaker targeting, lower conversion rates, or a more expensive market. If CAC is falling, the business may be improving message fit, channel quality, or funnel performance. Comparing CAC over time can help reveal whether scaling is becoming more efficient or more expensive.
When using the result, remember that CAC should be compared with customer lifetime value, gross margin, and payback period, not judged alone. A low CAC is helpful, but it does not guarantee strong economics if customers spend too little or churn too quickly. Even so, CAC remains one of the most important growth metrics in subscription, ecommerce, and digital businesses. This calculator gives a fast numerical view that supports budget planning, growth analysis, pricing decisions, and performance reporting.