Customer Acquisition Cost Calculator – CAC in 3 Easy Steps
Customer Acquisition Cost (CAC)
Use this customer acquisition cost calculator to see how much it costs your business to win a new paying customer.
Use this free customer acquisition cost calculator to find out how much you spend to win each new paying customer. Enter your marketing and sales costs for a period and the number of customers you gained, and the tool shows your CAC. Add customer lifetime value to see your LTV to CAC ratio as well.
Quick answer
CAC = (Total marketing expenses + Total sales expenses) ÷ New customers acquired. If a business spends $10,500 on marketing and $8,500 on sales in a month and gains 100 customers, its CAC is $19,000 ÷ 100 = $190. With an LTV of $600, the LTV to CAC ratio is about 3.2 : 1.
Table of Contents
CAC is one of the first numbers investors and finance teams ask for. It shows whether your growth is efficient or whether each new customer costs more than they will ever pay back.
This customer acquisition cost calculator splits spend into marketing and sales so you can see the full cost, not just the ad budget, which is where most quick CAC estimates go wrong.
Customer Acquisition Cost Formula
- Marketing expenses = Ad spend + Content, SEO and creative + Software and tools
- Sales expenses = Sales salaries + Commissions and bonuses + Sales tools and overhead
- CAC = (Marketing + Sales) ÷ New customers
- LTV : CAC = Customer lifetime value ÷ CAC
- CAC payback (months) = CAC ÷ Monthly gross profit per customer
How to Use the Customer Acquisition Cost Calculator
Step 1: Enter Marketing and Sales Expenses
Fill in the period’s costs. Marketing: Ad Spend $8,000, Content, SEO & Creative $2,000 and Software & Tools $500. Sales: Sales Team Salaries $6,000, Commissions & Bonuses $1,500 and Sales Tools & Overhead $1,000. Then enter 100 new customers and an optional LTV of $600.
Step 2: Read the CAC and LTV : CAC Ratio
Press Calculate CAC. Total spend is $19,000, so the CAC is $190. With a $600 LTV, the ratio is 3.2 : 1, which the tool marks as an excellent ratio.
Step 3: Test a Lower Lifetime Value
Change the LTV to $250 and calculate again. The ratio drops to 1.3 : 1, flagged as Poor (spending too much). At that level, overheads and refunds can easily make each new customer unprofitable.
What Is a Good CAC?
There is no universal number. A good CAC is one that your customers repay with profit. Most teams judge it by two checks:
| Check | Healthy range |
|---|---|
| LTV : CAC ratio | About 3 : 1 or better |
| CAC payback period | Under 12 months for most SaaS and subscription businesses |
| Blended vs paid CAC | Paid CAC is usually higher; track both |
Blended CAC vs Paid CAC
- Blended CAC divides all sales and marketing spend by all new customers, including organic and referral sign-ups.
- Paid CAC divides only paid ad spend by customers from paid channels.
- Blended CAC can look healthy while paid channels lose money, so calculate both when you can.
Example: CAC Payback
With a CAC of $190 and a customer who pays $50 a month at an 80% gross margin, monthly gross profit is $40. Payback is $190 ÷ $40 ≈ 4.75 months, which is well inside the usual 12-month target.
Ways to Lower Customer Acquisition Cost
- Improve landing page conversion rates so the same traffic brings more customers.
- Shift budget toward the channels with the lowest CAC.
- Invest in SEO and content, which keep bringing customers after the cost is paid.
- Start a referral program; referred customers usually cost less and stay longer.
- Tighten targeting to cut wasted ad spend on people who will never buy.
Common CAC Mistakes
- Counting only ad spend and leaving out salaries and tools.
- Mixing time periods, such as a month of spend with a quarter of customers.
- Counting free sign-ups or trials instead of paying customers.
Related tools: the Customer Lifetime Value Calculator, the ROAS Calculator and the Customer Churn Rate Calculator.
Frequently Asked Questions
How do you calculate customer acquisition cost?
Add all marketing and sales costs for a period and divide by the number of new paying customers in that period.
What costs should be included in CAC?
Ad spend, content and creative, marketing software, sales salaries, commissions and sales tools or overhead.
What is a good LTV to CAC ratio?
About 3 : 1 is a common target. Below 1 : 1 means you lose money on each new customer.
What is the difference between CAC and CPA?
CPA usually measures cost per action, such as a lead or sign-up, from one campaign. CAC measures the full cost of gaining a paying customer.
How often should I calculate CAC?
Monthly or quarterly, using the same period for costs and customers.
Is my data stored?
No. The customer acquisition cost calculator runs in your browser and nothing is saved.