Ecommerce CAC Calculator

Add up everything you spend on marketing and sales, divide by the number of new customers you got, and see what each one actually cost you.

Inputs

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Results

Updates as you type

Total Spend$15,000.00
New Customers150

Cost per Customer (CAC)

$100.00

How to calculate customer acquisition cost

Add every acquisition expense

Paid ads, content marketing, SEO, sales salaries, agency fees, software. Add each one as a line item so nothing gets missed.

Enter new customers acquired

How many paying customers did you get in the same period? Not leads, not signups -- actual paying customers.

See your cost per customer

Total spend divided by new customers. Now compare it to what each customer is worth to you. If CAC is higher than lifetime value, you have a problem.

How to bring your CAC down

Practical ways to acquire customers without spending more.

Invest in organic channels

SEO, content, and social take longer to pay off but the cost per customer drops over time. A blog post that ranks can bring in customers for years at near-zero marginal cost.

Turn customers into referral sources

Referred customers cost a fraction of paid ones. Set up a referral program and make it easy for happy customers to share. The acquisition cost is usually just the incentive.

Use reviews as conversion fuel

Product pages with reviews convert better, which means more customers from the same ad spend. Your CAC drops because you are converting a higher percentage of the traffic you already pay for.

Kill underperforming channels

If a channel costs 3x your average CAC, cut it and reallocate the budget. Not every channel works for every business and holding on to a bad one drags your blended CAC up.

Improve onboarding to reduce wasted spend

If customers sign up but never activate, you paid to acquire someone who did not stick. Better onboarding turns more signups into paying customers, which lowers effective CAC.

Track CAC monthly

Run this calculator at the end of each month with real numbers. Catching a CAC increase early gives you time to adjust before it becomes a serious problem.

Lower your CAC
with better reviews

Reviews improve conversion rates, which means more customers from the same spend. WiserReview collects them automatically so you do not have to chase them.

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FAQs

Common questions about customer acquisition cost.

It is the total amount you spend on marketing and sales to get one new paying customer. If you spent $15,000 last month across all channels and got 150 new customers, your CAC is $100. It is one of the most important numbers for figuring out if your growth is sustainable.
Everything tied to getting customers: ad spend, content creation, SEO tools, agency fees, sales team salaries, CRM software, affiliate payouts. The more complete you are, the more honest your CAC is. Leaving things out just makes the number look better than reality.
There is no single answer. The benchmark is the ratio of customer lifetime value to CAC. A 3:1 ratio is considered healthy -- meaning each customer generates 3 times what it cost to get them. Below 2:1 usually means you are spending too much to acquire.
CPA is cost per action within a single campaign, like a download or signup. CAC covers all sales and marketing costs across all channels to acquire a paying customer. CPA is a campaign metric. CAC is a business metric.
Yes. Your marketing and sales teams are a real cost of acquisition. If someone splits their time between acquisition and retention, include the acquisition portion. Ignoring salaries makes CAC look 30-50% lower than it actually is.
Indirectly but significantly. If your customers stick around and refer others, you get new customers at a much lower cost than paid acquisition. High retention also means you can afford a higher CAC because each customer is worth more over time.
Monthly is ideal. It lets you catch trends early. If CAC climbs two months in a row, you can investigate before it becomes a bigger problem. Quarterly works too, but monthly gives you faster feedback loops.
Not necessarily. CAC can spike during competitive seasons like holidays when ad costs rise. It also goes up when you enter a new channel that has not optimized yet. Worry if it trends up for 3+ months with no clear explanation.