Customer Acquisition Cost Calculator
Calculate your Customer Acquisition Cost (CAC) and LTV:CAC ratio. Free CAC calculator for marketing and sales spend analysis.
Customer Acquisition Cost Calculator
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Formula: CAC = (Total Marketing Spend + Total Sales Spend) / New Customers Acquired
Worked example — CAC: $400 | LTV:CAC Ratio: 3.0:1 — Healthy
Formula
CAC = (Total Marketing Spend + Total Sales Spend) / New Customers Acquired
Add all marketing and sales expenses for a given period, then divide by the number of new customers acquired during that same period. The result is your average cost to acquire one new customer.
Worked Examples
Example 1: SaaS Company CAC
Problem:A SaaS company spends $50,000/month on marketing and $30,000/month on sales, acquiring 200 new customers. Their average customer LTV is $1,200.
Solution:Total Spend = $50,000 + $30,000 = $80,000 CAC = $80,000 / 200 = $400 LTV:CAC = $1,200 / $400 = 3.0:1
Result:CAC: $400 | LTV:CAC Ratio: 3.0:1 — Healthy
Example 2: E-commerce Business
Problem:An online store spends $15,000 on ads and $5,000 on email marketing, gaining 500 new customers.
Solution:Total Spend = $15,000 + $5,000 = $20,000 CAC = $20,000 / 500 = $40
Result:CAC: $40 per customer
Frequently Asked Questions
What is Customer Acquisition Cost (CAC)?
Customer Acquisition Cost (CAC) is the total cost of acquiring a new customer, including all marketing and sales expenses. It is calculated by dividing total acquisition spending by the number of new customers gained in a specific period. For example, if you spend $10,000 on marketing and sales in a month and acquire 100 new customers, your CAC is $100. CAC is a critical metric for understanding business unit economics and profitability.
What is a good LTV:CAC ratio?
A healthy LTV:CAC ratio is generally considered to be 3:1 or higher, meaning the lifetime value of a customer is at least three times the cost to acquire them. A ratio below 1:1 means you are losing money on each customer. A ratio of 1:1 to 3:1 suggests room for improvement. A ratio above 5:1 may indicate you are underinvesting in growth and could afford to spend more on customer acquisition to scale faster.
How do I reduce my CAC?
To reduce CAC: 1) Improve conversion rates through better landing pages and sales processes. 2) Focus on high-performing marketing channels and cut underperformers. 3) Leverage organic channels like SEO and content marketing for long-term cost reduction. 4) Implement referral programs to acquire customers at lower cost. 5) Optimize your sales funnel to reduce drop-off. 6) Use marketing automation to increase efficiency. 7) Target higher-intent audiences with better segmentation.
What costs should be included in CAC?
CAC should include all costs directly related to acquiring customers: advertising spend, marketing team salaries, sales team salaries and commissions, marketing software and tools, content creation costs, agency fees, event and sponsorship costs, and any other direct acquisition expenses. Some companies also include a portion of overhead, but the most common approach is to include only direct acquisition costs for cleaner analysis.
How often should I calculate CAC?
Calculate CAC monthly for tactical decisions and quarterly for strategic planning. Monthly CAC helps identify trends and optimize campaigns in real-time. Quarterly CAC smooths out month-to-month volatility and provides a clearer picture of overall efficiency. Annual CAC is useful for board reporting and long-term trend analysis. Be sure to compare CAC across channels to identify your most efficient acquisition sources.
What is the difference between blended CAC and paid CAC?
Blended CAC divides all acquisition spend by every new customer, including those who arrived organically through word of mouth, direct traffic or referrals. Paid CAC divides only paid channel spend by the customers that channel actually produced. Blended CAC looks flattering when organic volume is strong and can hide a paid channel that is losing money. Report both: blended CAC tells you what growth costs overall, while paid CAC tells you whether extra spend is still buying customers efficiently.
How is the CAC payback period calculated and why does it matter?
Payback period is CAC divided by the gross profit a customer generates per month, giving the number of months before the acquisition cost is recovered. A customer costing $400 who contributes $50 of gross profit a month pays back in eight months. It matters because the LTV:CAC ratio ignores timing: two businesses can share a 3:1 ratio while one recovers its cash in six months and the other in three years, which is a completely different funding requirement.
Why should LTV be based on gross margin rather than revenue?
Lifetime value built on gross revenue ignores the cost of serving the customer, such as hosting, support, payment processing and fulfilment. A customer paying $1,200 over their lifetime at a 60% gross margin contributes $720, so the true ratio against a $400 CAC is 1.8:1, not the 3:1 that a revenue-based figure suggests. Using contribution margin keeps the ratio comparable between a software business and a physical-goods business with very different cost structures.
Why can CAC be distorted when spend and new customers are measured in the same month?
The formula assumes spend and customers belong to the same cohort, but sales cycles create a lag: money spent in March may close customers in May. In a fast-growing business, dividing this month's larger spend by this month's customers, many of whom were generated by last month's smaller spend, overstates CAC. Longer-cycle businesses should either lag the spend figure by the average sales cycle or move to cohort-based reporting.
What is the difference between cost per lead and customer acquisition cost?
Cost per lead divides acquisition spend by the leads generated, while CAC divides the same spend by the customers who actually closed. The bridge between them is the lead-to-customer conversion rate: CAC equals cost per lead divided by that rate. A channel that spends $10,000 to produce 200 leads has a $50 cost per lead, but at a 5% close rate those leads become 10 customers, so CAC is $1,000. Optimising cost per lead alone can raise CAC if the cheaper leads convert worse.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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