About the CAC Calculator
Customer Acquisition Cost (CAC) is one of the most important growth metrics for any business that acquires customers through sales and marketing. A low CAC relative to customer lifetime value means each new customer generates a positive return. A high CAC relative to LTV signals that growth is unsustainable or inefficient. This calculator gives you your CAC in seconds so you can compare channels, benchmark against industry norms, and make informed budget decisions.
How CAC Is Calculated
The formula is straightforward: divide total sales and marketing spend by the number of new customers acquired during the same period.
CAC = Total Sales & Marketing Spend ÷ New Customers Acquired
The key variable is scope — what counts as spend, and what counts as a "new customer." Consistency matters far more than the exact definition you choose; use the same methodology every period so you can track trends over time.
What to Include in Spend
- Paid advertising — all ad platforms: search, social, display, native, podcast, OOH
- Sales headcount — salaries, commissions, benefits for sales team members
- Marketing headcount — salaries for marketing staff who drive acquisition
- Agencies and contractors — creative, media buying, SEO, PR agencies
- MarTech and CRM tools — software used to manage and convert leads
- Events and sponsorships — trade shows, conferences, and co-marketing
When to Use This Calculator
- Monthly or quarterly reviews — track whether CAC is rising or falling as you scale
- Channel comparison — calculate CAC per channel to find your most efficient acquisition source
- Startup metrics — investors will ask for CAC; having a clean, defensible number matters
- Budget planning — if you know your CAC and growth targets, you can model the spend required to hit them
- LTV:CAC analysis — compare CAC against customer lifetime value to validate unit economics
CAC is a planning and analysis tool. It should be analyzed alongside LTV, retention rates, and payback period for a complete picture of acquisition health. Definitions of "new customer" and included costs vary — use consistent methodology across periods for meaningful trend data. Not financial advice.
Frequently Asked Questions
What is CAC?
Customer Acquisition Cost (CAC) is the total amount of money a business spends to acquire one new paying customer. It includes all sales and marketing expenses — advertising spend, agency fees, salaries for sales and marketing staff, tools, events, and any other cost directly tied to acquiring customers — divided by the number of new customers brought in over the same period.
How do you calculate customer acquisition cost?
CAC = Total Sales & Marketing Spend ÷ Number of New Customers Acquired. For example, if you spent $50,000 on sales and marketing in a month and acquired 200 new customers, your CAC is $250. Always make sure the time period for spend and customer count match — using Q1 spend against Q2 customers will produce a misleading result.
What costs should be included in CAC?
CAC typically includes: all paid advertising (search, social, display), content and SEO costs, sales team salaries and commissions, marketing team salaries, agency and contractor fees, trade show and event expenses, marketing software and CRM costs, and any direct costs tied to generating and converting leads. It does NOT include customer success, support, or onboarding costs — those are factored into Customer Lifetime Value (LTV) calculations instead.
What is a good CAC?
There is no universal 'good' CAC — it depends entirely on your industry, business model, average deal size, and retention. The most important benchmark is your LTV:CAC ratio. A ratio of 3:1 or higher is generally considered healthy for SaaS businesses, meaning you earn $3 in lifetime value for every $1 spent acquiring the customer. Below 1:1 means you are spending more to acquire customers than they are worth.
Can CAC be used for ecommerce and SaaS?
Yes. CAC applies to any business that acquires customers through sales and marketing effort. For ecommerce, CAC is often calculated per campaign or channel (e.g., Facebook ads, Google Shopping). For SaaS, CAC is typically measured quarterly or annually because sales cycles are longer. The formula is the same — total spend divided by new customers — but the time horizon and included costs may differ.
What if I acquired zero customers?
If you acquired zero new customers during the period, CAC is mathematically undefined — you cannot divide by zero. This calculator blocks the calculation in this case and shows an error. A period of zero acquisitions is worth investigating: it may indicate a campaign that failed to convert, a sales pipeline issue, or simply a period outside your normal acquisition cycle.
Is CAC the same as ROI?
No. CAC measures cost efficiency — how much you spend to acquire one customer. ROI measures return on investment — the revenue or profit generated relative to what you spent. CAC is an input into ROI analysis: once you know your CAC, compare it against customer LTV to determine whether the return on acquiring each customer is positive. Low CAC alone doesn't indicate profitability if LTV is also low.
