Customer Acquisition Cost (CAC) Calculator
Divide total sales and marketing spend by new customers to get your CAC — the number that tells you how much you can afford to spend and still profit. Your own spend and counts.
What it costs to win one customer
Customer Acquisition Cost (CAC) is calculated by dividing the total costs of sales and marketing over a given period by the number of new customers acquired in that same period. The formula is: CAC = Total Sales & Marketing Spend / Number of New Customers. Total Sales & Marketing Spend includes all expenses directly related to attracting and converting customers: salaries and commissions for sales and marketing staff, advertising costs (digital, print, TV, etc.), software subscriptions (CRM, marketing automation), content creation, event costs, and any overhead allocated to these departments. It excludes product development, general administration, and support costs. The number of new customers is the count of unique paying customers who made their first purchase within the period. This metric is calculated this way because it directly ties the cost of growth efforts to the revenue-generating outcome, enabling businesses to assess the efficiency of their acquisition strategies and ensure that the cost to acquire a customer does not exceed the customer's lifetime value, which is critical for long-term profitability. A lower CAC indicates more efficient acquisition, but the absolute number must be compared against customer lifetime value (LTV) to determine sustainable spending.
SaaS Startup with Paid Ads
A B2B SaaS company spends $50,000 on sales and marketing in a quarter: $30,000 on Google Ads, $10,000 on a salesperson's salary, $5,000 on a CRM tool, and $5,000 on content marketing. They acquire 200 new customers in that quarter. CAC = $50,000 / 200 = $250 per customer. This means each new customer costs $250 to acquire. If their average monthly subscription is $50 and customers stay for 12 months (LTV = $600), then the CAC is well within the 5:1 LTV:CAC ratio, indicating healthy spending.
Brick-and-Mortar Retail Store
A local clothing store runs a month-long campaign with $2,000 on flyers and local Facebook ads, $1,000 on a part-time marketing assistant, and $500 on an in-store event (total $3,500). During that month, they track 70 new customers who made their first purchase. CAC = $3,500 / 70 = $50 per customer. Since the average purchase is $80 and repeat rate is 30%, the store must ensure that the LTV exceeds $50 to avoid losing money on acquisition.
E-commerce App with Influencer Marketing
An online fashion brand spends $15,000 on influencer partnerships and $5,000 on Instagram ads over a month, with no other sales costs ($20,000 total). They gain 400 new customers from these channels. CAC = $20,000 / 400 = $50 per customer. However, they also spent $2,000 on a discount code for first-time buyers, which should be included if it's a marketing cost. Including it raises the CAC to $22,000 / 400 = $55. This nuance matters for accurate budgeting.
A 'good' CAC is highly relative to your business model, industry, and customer lifetime value. As a rule of thumb, your CAC should be less than one-third of your customer's lifetime value (LTV:CAC ratio of 3:1 or higher). A ratio of 1:1 means you break even on acquisition—dangerous unless you have very high retention. For subscription businesses, a common target is LTV:CAC > 3:1. For transactional businesses, aim for CAC to be recouped within the first few purchases. Be wary of comparing your CAC to generic industry averages, as they vary widely by channel, product price, and sales cycle. Instead, track your own CAC over time and benchmark against your own historical performance. A rising CAC may indicate market saturation or ad fatigue; a falling CAC might mean improved efficiency or lower-quality customers. Always segment CAC by channel (e.g., paid ads vs. organic) to identify which sources are most cost-effective. Remember that CAC does not include post-acquisition costs like support or retention, so a low CAC doesn't guarantee profitability if customers churn quickly.
A common mistake is failing to include all sales and marketing costs, such as salaries, software subscriptions, and overhead, leading to an artificially low CAC. Another error is including customers who were not acquired in the same period as the spend, e.g., using annual spend with monthly customer counts. This mismatches the numerator and denominator, distorting results. Some businesses mistakenly count leads or sign-ups instead of paying customers, which inflates the denominator and understates true acquisition cost. Edge cases: If you have a long sales cycle (e.g., enterprise deals), use a trailing average of spend over several periods to smooth out lumpy customer counts. For businesses with zero spend in a period (e.g., all organic), CAC is undefined—consider using a blended cost or attributing a portion of fixed marketing salaries. Also, be careful with one-time large campaigns: they may skew a single period's CAC, so use a longer timeframe for analysis.
- Customer Acquisition Cost (CAC)
- The total cost of acquiring a new customer, calculated by dividing all sales and marketing expenses by the number of new customers gained in a specific period.
- Lifetime Value (LTV)
- The predicted net profit attributed to the entire future relationship with a customer.
- LTV:CAC Ratio
- A metric comparing the lifetime value of a customer to the cost of acquiring them, used to assess the sustainability of growth spending.
- Sales & Marketing Spend
- All costs related to promoting and selling a product, including advertising, salaries, commissions, and software.
- New Customer
- A first-time paying customer who completes a purchase or signs a contract within the measurement period.
Should I include salaries in CAC?
Yes, include salaries and commissions for sales and marketing staff, as they are direct costs of acquisition.
What if I have no sales team—only ads?
Then your CAC is just your ad spend divided by new customers, but consider any tools or content costs you incur.
How often should I calculate CAC?
Monthly or quarterly is typical, but use a longer period if your sales cycle is long to avoid volatility.
Can CAC be too low?
Yes, an extremely low CAC might indicate you're not spending enough to reach your full market potential, or you're tracking customers incorrectly.
What's the difference between blended CAC and paid CAC?
Blended CAC includes all channels (organic, referral, paid), while paid CAC only includes costs from paid advertising channels.
How do I handle customers from multiple channels?
Attribute each customer to the channel that initiated the acquisition, then calculate CAC per channel for better insights.
Is CAC the same for every customer?
No, it varies by channel and campaign; segmenting gives a more accurate picture.
What if my CAC is higher than my profit per customer?
That's unsustainable—you need to reduce acquisition costs, increase customer value, or both.
The zero-cost lead playbook + AI follow-up in every bundle are built to drive CAC down before you spend on ads.
Startup Cost Calculator
Add up what it really takes to launch — and what a bundle replaces.
Service Pricing Calculator
Price every job for profit, not guesswork.
Break-Even Calculator
The exact number of jobs that turns the lights green.
Revenue Goal Calculator
Reverse-engineer the leads behind your number.
Catalog ROI Calculator
The time and money the catalog hands back every year.