Enter your total marketing and sales spend alongside the number of new customers acquired to calculate your Customer Acquisition Cost (CAC) and key performance benchmarks.
Please enter at least one cost and the number of new customers.
* LTV:CAC ratio above 3:1 is generally considered healthy. Payback calculated assuming monthly revenue = LTV ÷ 12.
Customer Acquisition Cost CAC Calculator
What This Calculator Does and Why It Matters
Customer Acquisition Cost, or CAC, is one of the most important metrics any business can track. It tells you exactly how much you spend — across marketing, sales, tools, and salaries — to win a single new paying customer. When you know this number, every budget decision becomes sharper.
This free CAC calculator takes your full marketing and sales spend, divides it by new customers acquired, and also outputs your LTV-to-CAC ratio and estimated payback period. These three metrics together give you a complete picture of whether your growth spending is actually sustainable or quietly burning cash.
According to Investopedia, CAC is calculated by dividing total sales and marketing costs by the number of new customers acquired in a given period. This calculator does exactly that, while also breaking down the spend components so you can see where the money is going.
How to Use This Calculator
Step-by-Step Instructions
- Enter your ad spend — paid search, social ads, display, and any other paid media for the period.
- Add content and SEO costs including freelance writers, tools, and agency fees.
- Enter marketing salaries and the cost of marketing tools and software subscriptions.
- Input your sales team salaries, commissions, and any other direct sales expenses.
- Enter the total number of new customers you acquired during the same period.
- Optionally, enter your average customer lifetime value (LTV) to unlock the LTV:CAC ratio and payback period.
- Click Calculate CAC to see your full results including a health rating on your LTV-to-CAC ratio.
The Formula Explained
Breaking Down the Formula
The core CAC formula is simple. You add up all sales and marketing costs for a given period, then divide by the number of new customers acquired in that same period. The result is your cost per customer.
Total Spend = Marketing Spend + Sales Spend. CAC = Total Spend ÷ New Customers Acquired. LTV:CAC Ratio = Customer Lifetime Value ÷ CAC. CAC Payback (months) = CAC ÷ (LTV ÷ 12).
Example Calculation with Real Numbers
Suppose your business spent $18,500 on marketing and $8,000 on sales in a given month. Total spend is $26,500. During that month you acquired 85 new customers. Your CAC is $26,500 ÷ 85 = $311.76. If your average LTV is $1,200, your LTV:CAC ratio is 3.85:1, which is considered healthy. Your payback period is $311.76 ÷ ($1,200 ÷ 12) = 3.1 months.
Comparing this number month-over-month or channel-by-channel is where the real value lies. A CAC that rises without a corresponding rise in LTV is a warning sign that demands attention.
When Would You Use This
Real Life Use Cases
This calculator is useful for startup founders reviewing their first paid campaign, for marketing managers preparing budget justifications, and for investors conducting due diligence on a growth-stage company. Any time money is being spent to win customers, CAC is the metric that grounds the conversation in reality.
SaaS founders especially need to track CAC closely alongside churn and LTV. A business with a $500 CAC and a 3-month payback can scale aggressively. A business with a $500 CAC and a 24-month payback needs to rethink its model before spending more. You can explore how churn affects your LTV and CAC relationship using the SaaS churn rate impact on customer LTV calculator.
E-commerce brands comparing channels — Google Ads versus Meta versus influencer marketing — can use this calculator to run a CAC estimate for each channel separately to see which drives the most efficient growth. The SaaS LTV to CAC ratio calculator offers an extended view of this relationship for subscription businesses.
Specific Example Scenario
A DTC brand is running two ad channels simultaneously. Google Ads drove 60 new customers with $9,000 in spend — a CAC of $150. Their Meta campaigns drove 40 customers at $8,000 spend — a CAC of $200. With the same LTV of $450, Google yields a 3:1 ratio while Meta yields 2.25:1. The data clearly shows where to reallocate the next dollar of budget.
Tips for Getting Accurate Results
Use the Same Time Period for Spend and Customer Count
One of the most common CAC calculation errors is mixing time periods. Make sure your total spend and your new customer count both cover exactly the same date range — whether that is a month, a quarter, or a year. Mixing a quarterly spend with a monthly customer count will give you a meaningless number.
Include All Relevant Costs, Not Just Ad Spend
Many teams underreport CAC by only entering paid media spend. The real CAC includes everything it takes to acquire a customer — salaries of marketing and sales staff, software subscriptions, agency retainers, event costs, and more. Leaving these out makes your CAC look better than it is, which leads to overconfident budget decisions. The CAC ROI digital marketing lead cost calculator can help you factor in lead-level costs as well.
Track CAC by Channel, Not Just in Aggregate
An aggregate CAC across all channels is a useful starting point, but it hides the channels that are working and those that are not. If possible, run this calculator separately for each major acquisition channel so you can see which ones are delivering the best return and which ones need to be cut or optimized.
Frequently Asked Questions
What is a good CAC for my business?
There is no universal benchmark because a good CAC depends entirely on your customer lifetime value. A $500 CAC is excellent if your LTV is $5,000. It is catastrophic if your LTV is $400. Always evaluate CAC in the context of your LTV:CAC ratio. A ratio of 3:1 or higher is the widely cited industry standard for a sustainable growth model.
What is the difference between CAC and CPA?
Cost Per Acquisition (CPA) typically refers to the cost to drive a specific conversion action — like a free trial signup, a lead form submission, or a purchase. CAC specifically refers to the cost to acquire a paying customer. CPA is often used at the campaign level, while CAC is a business-level metric that includes all sales and marketing overhead.
Should I include salaries in my CAC calculation?
Yes, for an accurate CAC you should include the portion of salaries for all employees who work on acquiring customers. This includes your marketing team, sales reps, and anyone else whose work directly contributes to winning new customers. Excluding salaries understates your true cost.
How often should I calculate CAC?
Most businesses calculate CAC monthly or quarterly. Monthly tracking helps you spot trends early. Quarterly analysis is better for making strategic budget decisions. If you are in a fast-growth phase or running heavy paid campaigns, monthly is the better cadence.
What does the LTV:CAC ratio mean?
The LTV:CAC ratio tells you how much value you get back for every dollar you spend to acquire a customer. A ratio of 1:1 means you are breaking even. A ratio of 3:1 means you earn three dollars in lifetime value for every dollar spent on acquisition. Most growth investors look for at least a 3:1 ratio as a baseline for a healthy, scalable model.
What is CAC payback period?
The CAC payback period is the number of months it takes for a customer to generate enough revenue to cover the cost of acquiring them. A payback of 12 months or less is generally considered healthy for SaaS businesses. Consumer businesses or those with high churn should aim for even shorter payback windows.
Can I calculate CAC per channel with this tool?
Yes. Simply enter only the spend associated with one channel and the customers acquired from that channel. Run the calculator again for each channel separately. This approach gives you a channel-level CAC that is far more useful for optimization than a blended average across all channels.
How does CAC relate to ROAS?
Return on Ad Spend (ROAS) measures revenue generated per dollar of ad spend. CAC measures the cost to acquire one customer including all sales and marketing costs. The two metrics complement each other. A high ROAS campaign may still produce a poor CAC if the sales overhead is high. Looking at both metrics together gives a cleaner picture of true acquisition efficiency.
Conclusion
Knowing your CAC is not optional if you want to grow profitably. It is the foundation metric that tells you whether your marketing and sales investment is building a business or eroding one. This free calculator gives you CAC, your LTV:CAC ratio, and your payback period in seconds — no spreadsheet required.
Run it monthly, compare it by channel, and use the results to make smarter budget decisions. The businesses that scale efficiently are the ones that measure CAC carefully and act on what the numbers show.