How to Calculate Customer Acquisition Cost (Formula + Examples)

Customer acquisition cost (CAC) is what you spend on sales and marketing to win one new customer. The formula is CAC = total sales and marketing cost ÷ new customers.

If you spend $10,000 in a month and win 200 customers, your CAC is $50.

Below is how to calculate it step by step, what to include, what a good CAC looks like and how to bring it down.

Key takeaways

• CAC = sales and marketing spend ÷ new customers, for the same time period.
• Count only new customers. Repeat buyers make CAC look lower than it is.
• Judge CAC against lifetime value. A 3:1 LTV to CAC ratio is the usual target.
• A 10% lift in conversion rate cuts CAC by about 9% at the same spend.

What Is Customer Acquisition Cost?

CAC tells you how much it costs to turn a stranger into a paying customer. It covers every cost of finding and winning that customer, from ads to the salaries of the people who run them.

People often mix it up with cost per acquisition (CPA). CPA can count any conversion, like a signup or a lead. CAC only counts the moment someone becomes a paying customer, so it is usually the higher number.

To see how other businesses win customers, read these customer acquisition examples.

How Do You Calculate Customer Acquisition Cost?

CAC = Total sales and marketing cost ÷ Number of new customers

1. Pick a time period

Choose a month, quarter or year. Use the same period for costs and customers, or the number will be off.

2. Add up your costs

Total every sales and marketing cost for that period. The next section lists what belongs in it.

3. Count new customers

Count only first-time buyers or new paying accounts. Leave out repeat orders and renewals.

4. Divide costs by customers

Divide step 2 by step 3. The result is what one new customer cost you.

Worked examples

Business	Spend (one period)	New customers	CAC
Clothing store	$10,000 a month	200	$50
SaaS company	$50,000 a quarter	1,000	$50
Online store	$20,000 a month	500	$40

What Costs Go Into CAC?

Include every cost that goes into finding and winning new customers:

• Ad spend: paid search, social ads, sponsorships and affiliate fees.
• People: salaries, commissions and bonuses for sales and marketing staff, or the share of time spent on acquisition.
• Agencies and freelancers: designers, writers, media buyers and consultants.
• Tools: CRM, email, analytics and other marketing software.
• Content and creative: video, photography and design production.
• Events: trade shows, webinars and their travel costs.

Leave out costs that serve existing customers, like support staff or retention emails. Mixing them in blurs what new customers cost.

Types of CAC to Track

One blended number hides a lot. These cuts show where your money works:

• Blended CAC: all acquisition costs divided by all new customers, including ones who found you for free.
• Paid CAC: paid media spend divided by customers from paid channels only. It shows what growth costs when you buy it.
• CAC by channel: Google Ads, Meta, email or referrals, each on its own, so you can move budget to the cheapest one.
• CAC by product or segment: what it costs to win a customer for one product, plan or market.

What Is a Good Customer Acquisition Cost?

There is no single good CAC. A $300 CAC is cheap for software that brings in $3,000 a customer and ruinous for a $40 candle. What matters is how CAC compares with what a customer is worth.

LTV to CAC ratio: divide customer lifetime value by CAC. A ratio of 3:1 or higher is the common target, meaning each customer brings in three times what they cost. Below 1:1, you lose money on every customer.

Learn how to work out the top half of that ratio in our guide to customer lifetime value with examples.

CAC payback period: the months of gross profit it takes to earn back CAC. Shorter is better, because cash comes back sooner to fund the next customer.

CAC benchmarks

Published benchmarks with a clear method mostly cover B2B software. These are the latest medians:

Benchmark (B2B SaaS)	Median	Source
LTV to CAC ratio	4.1x	Aleph × Benchmarkit 2026 (2025 data)
CAC payback period	16 months (top quarter: 6 or fewer)	Aleph × Benchmarkit 2026 (2025 data)
CAC payback, deals under $5K a year	11 months	Aleph × Benchmarkit 2026 (2025 data)
Blended CAC ratio	$1.30 of spend per $1 of new annual revenue	Aleph × Benchmarkit 2026 (2025 data)
New-customer CAC ratio	$1.63 of spend per $1 of new annual revenue	Aleph × Benchmarkit 2026 (2025 data)

For online stores, reliable public CAC averages are rare. A practical check is whether the first order covers CAC. If not, you need repeat purchases to break even.

How to Lower CAC by Lifting Conversion Rate

CAC has two levers: spend less, or win more customers from the same spend. The second one is usually easier, because every visitor you already paid for becomes cheaper when more of them buy.

Here is the arithmetic. Say you spend $10,000 a month and 10,000 visitors arrive. At a 2% conversion rate, you win 200 customers, so CAC is $50.

Lift conversion by 10%, from 2% to 2.2%. Now the same $10,000 wins 220 customers, and CAC drops to $45.45. That is about 9% lower without spending a cent more.

	Before	After a 10% conversion lift
Monthly spend	$10,000	$10,000
Visitors	10,000	10,000
Conversion rate	2.0%	2.2%
New customers	200	220
CAC	$50.00	$45.45

A WiserNotify example

Social proof is one way to lift conversion without more traffic. A store can use WiserNotify to show recent purchases, live visitor counts and reviews on product and checkout pages, so new visitors see that others are buying.

Track conversion rate for a few weeks before and after you switch it on. Any lift flows straight into a lower CAC.

For more ideas, see these social proof examples and our guide to how to increase conversion rate in sales.

Other Ways to Reduce CAC

• Move budget to cheaper channels: compare CAC by channel and shift spend toward the ones that win customers for less.
• Fix funnel leaks: find the step where most people drop off, like a long checkout, and fix it first. Start with these tips to increase checkout conversion.
• Grow referrals and word of mouth: customers who come through a friend cost little to win.
• Invest in search and content: organic traffic keeps arriving after you stop paying for it.
• Keep the customers you win: retention does not lower CAC, but it raises lifetime value, which makes the same CAC more affordable. See customer retention analytics.

Common CAC Mistakes

• Counting only ad spend: leaving out salaries and tools makes CAC look far lower than it is.
• Counting repeat buyers: returning customers inflate the customer count and shrink CAC.
• Mismatched time periods: spend from one month and customers from another give a misleading figure.
• Ignoring sales cycle lag: if deals take three months to close, compare this quarter’s customers with last quarter’s spend.
• Looking at CAC alone: without lifetime value, you cannot tell a good CAC from a bad one.

Wrap Up

Work out CAC the same way every month, split it by channel and compare it with what a customer is worth. That tells you where to spend more and where to cut.

The fastest win is often not cheaper ads but turning more of the visitors you already pay for into customers. To check how much of each sale you keep after costs, try our profit margin calculator.