Customer Acquisition Cost (CAC) Calculator
Calculate your Customer Acquisition Cost (CAC) and compare it to customer lifetime value to judge the profitability of your marketing and sales efforts. Essential for any business evaluating paid advertising, sales team ROI, or unit economics.
About this calculator
Customer Acquisition Cost (CAC) is the total sales and marketing spend required to win one new customer. The formula is: CAC = (Marketing Spend + Sales Expenses) / New Customers Acquired. A low CAC relative to the revenue each customer generates signals a healthy, scalable business. A complementary metric is Customer Lifetime Value (LTV), often estimated as LTV = Average Order Value × Annual Purchase Frequency × Average Customer Lifespan. The LTV:CAC ratio is a critical benchmark — a ratio above 3:1 is generally considered healthy, while a ratio below 1:1 means you are spending more to acquire customers than they will ever return. Tracking CAC by channel (e.g., paid search vs. organic) helps marketers reallocate budgets toward the most efficient acquisition sources and improve overall profitability.
How to use
Your business spent $15,000 on marketing and $5,000 on sales expenses last quarter, acquiring 80 new customers. CAC = (15,000 + 5,000) / 80 = 20,000 / 80 = $250 per customer. Now assess profitability: average order value is $120, purchase frequency is 4 times per year, and customers stay for an average of 3 years. LTV = $120 × 4 × 3 = $1,440. LTV:CAC ratio = 1,440 / 250 = 5.76:1. This ratio comfortably exceeds the 3:1 benchmark, indicating that each dollar spent acquiring customers generates strong long-term returns.
Frequently asked questions
What is a good LTV to CAC ratio for a SaaS or e-commerce business?
A ratio of 3:1 is the widely cited minimum target for healthy unit economics — each customer generates three times what it cost to acquire them. Ratios above 5:1 indicate very efficient acquisition and may even suggest you have room to increase marketing spend aggressively to capture market share. Below 1:1 the business model is unprofitable at the unit level and will not improve with scale. SaaS companies often target higher ratios (4:1 to 6:1) because subscription revenue is predictable, while e-commerce businesses typically work closer to the 3:1 floor due to higher churn and variable repeat-purchase rates.
How do I reduce customer acquisition cost without cutting marketing spend?
The most effective lever is improving conversion rates at each stage of the funnel — better landing pages, clearer calls to action, and faster response times from sales all lower CAC without reducing budget. Investing in organic channels like SEO, content marketing, and referral programs builds long-term acquisition pipelines at near-zero marginal cost per customer. Tightening audience targeting in paid channels reduces wasted impressions. Retaining existing customers also improves the blended CAC because customer-success and upsell revenue is acquired at a fraction of the cost of new-customer acquisition.
Why should marketing spend and sales expenses both be included in the CAC calculation?
Marketing spend alone undercounts the true cost of winning a customer because the sales team's time, salaries, commissions, and tools are also consumed in the process. Excluding sales expenses flatters CAC and can lead to poor resource allocation decisions, such as hiring more salespeople without realizing their cost-per-deal exceeds the revenue they generate. Including both functions gives a complete picture of total go-to-market efficiency. For businesses with long sales cycles, it is also important to match costs and customers acquired within the same time window to avoid distorting the metric.