Free CAC Calculator

Everything spent to win the customer: ad budget, the salaries of sales and marketing staff, agency and freelancer fees, and the tools those teams use. Leaving out salaries is the most common mistake and it can halve the apparent cost.

Three to one is the widely used benchmark for a healthy subscription business. Below one to one you lose money on every customer. Far above five to one usually means you are underinvesting in growth rather than running an unusually efficient operation.

Blended CAC divides all spend by all new customers, including those who arrived organically. Paid CAC counts only paid spend and the customers it produced. Blended flatters your numbers, so investors normally ask to see both.

Run the calculation once per channel using only that channel's spend and the customers it produced. This is where attribution starts to matter, because a customer who saw an ad and later searched your brand can be claimed by two channels at once.

Match the spend period to the sales cycle. If your average deal takes two months to close, spend from January produces customers in March, and dividing January spend by January customers will mislead you in both directions.

Only count people who paid. Including trials makes CAC look far better than it is, particularly with a generous free tier. Track cost per trial separately if you want to see where the funnel is leaking.

How many months of gross margin it takes to recover the acquisition cost. Under twelve months is generally considered healthy for a subscription business. It matters more than the raw CAC number, because it determines how much cash you need to fund growth.

Almost always channel saturation. You reach the cheapest, most motivated part of an audience first, and each additional customer from the same channel costs more. Rising CAC usually signals it is time to test a new channel rather than raise budgets.

Improve conversion before increasing spend, since a better landing page lowers CAC across every channel at once. Beyond that, referral programmes, content that compounds, and being present where buyers already research all reduce reliance on paid acquisition.

Yes. Time has a cost. If content, community work and outreach occupy a founder for twenty hours a week, the value of that time belongs in the spend figure. Businesses that call organic acquisition free tend to badly misjudge their unit economics.