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Customer Acquisition Cost

BusinessSales and Conversion
Acquisition costs for the period

Ads, content, events, agency fees and marketing salaries.

Sales salaries, commissions and sales tools.

Free trials, onboarding, referral bonuses.

Customers and revenue
Customer acquisition cost —
Total acquisition spend
—
Marketing cost per customer
—
Sales cost per customer
—
CAC payback period
—
Where the acquisition budget went
The chart appears with your result

Customer acquisition cost (CAC) is everything you spent to win customers in a period divided by the number of new customers won in that same period. If marketing cost $10,000 and sales $5,000 in a quarter that brought in 100 customers, CAC is $15,000 ÷ 100 = $150 per customer.

About this tool

Founders, growth marketers and finance leads use CAC to judge whether a channel or a sales team is paying for itself. Enter the period's marketing spend, sales spend and any other acquisition costs, then the number of customers you won. The calculator returns the blended CAC, the marketing and sales share per customer, and a donut chart of how the budget split. Add monthly revenue per customer and gross margin to see the payback period: how many months of gross profit one customer needs to repay what it cost to win. The figure is blended across every channel, so it can hide one expensive channel behind a cheap one; run each channel separately when you need that view.

How to use it

  1. Enter the period's costs

    Type marketing, sales and other acquisition spend for one month, quarter or year. Leave sales or other costs empty if they do not apply.

  2. Enter customers won

    Count only new paying customers whose first purchase fell in that same period.

  3. Add revenue and margin

    Give the average monthly revenue per customer and move the gross margin slider to get the payback period.

  4. Read the split

    Compare the marketing and sales cost per customer, and check the chart to see which cost line dominates.

Examples

$15,000 spend, 100 customers

Marketing spend
10000
Sales spend
5000
Other acquisition costs
0
New customers won
100
Monthly revenue per customer
50
Gross margin
60

Result Customer acquisition cost: $150.00
Total acquisition spend: $15,000.00
Marketing cost per customer: $100.00
Sales cost per customer: $50.00
CAC payback period: 5 months

  1. Total acquisition spend = $10,000.00 + $5,000.00 + $0.00 = $15,000.00
  2. CAC = $15,000.00 ÷ 100 customers = $150.00
  3. Monthly gross profit per customer = $50.00 × 60% = $30.00
  4. Payback = $150.00 ÷ $30.00 = 5 months

Marketing and sales together cost $15,000 and won 100 customers, so each cost $150. At $30 of gross profit a month, that cost is earned back in 5 months.

Sales-led SaaS, 400 accounts

Marketing spend
120000
Sales spend
180000
Other acquisition costs
20000
New customers won
400
Monthly revenue per customer
40
Gross margin
75

Result Customer acquisition cost: $800.00
Total acquisition spend: $320,000.00
Marketing cost per customer: $300.00
Sales cost per customer: $450.00
CAC payback period: 26.7 months

  1. Total acquisition spend = $120,000.00 + $180,000.00 + $20,000.00 = $320,000.00
  2. CAC = $320,000.00 ÷ 400 customers = $800.00
  3. Monthly gross profit per customer = $40.00 × 75% = $30.00
  4. Payback = $800.00 ÷ $30.00 = 26.7 months

$320,000 across three cost lines over 400 accounts gives $800 each. With $30 of monthly gross profit per account, payback runs past two years.

How it is calculated

CAC = (M + S + O) ÷ N; Payback (months) = CAC ÷ (R × G)

M
Marketing spend in the period
S
Sales spend in the period
O
Other acquisition costs (trials, onboarding, referral rewards)
N
New customers acquired in the same period
R
Average monthly revenue per customer
G
Gross margin as a fraction

The costs and the customer count must cover the same window, otherwise CAC drifts with seasonality. Payback uses gross profit rather than revenue, because only the margin left after serving the customer repays the money spent to acquire them. A business at 60% margin earning $50 a month per customer recovers $30 a month, so a $150 CAC pays back in 5 months.

When not to use it

  • Do not use a blended figure to rank individual ad channels; calculate each channel on its own.
  • Skip it for long enterprise cycles where this period's spend wins customers months later, unless you lag the counts.
  • It is not a lifetime value measure and says nothing about churn.

Common mistakes

  • Counting existing customers who upgraded as new customers lowers CAC artificially.
  • Leaving out sales salaries and commissions makes CAC look far cheaper than it is.
  • Using revenue instead of gross profit for payback shortens the period misleadingly.
  • Mixing a quarter of spend with a month of new customers triples the result.

Frequently asked questions

What costs belong in CAC?

Include everything spent to win new customers: paid ads, content and agency fees, marketing and sales salaries, commissions, sales software, events, and costs such as free trials or referral bonuses. Exclude costs of serving existing customers, such as support or account management for renewals.

What is a good CAC payback period?

Many subscription businesses aim to recover CAC within 12 months, and payback beyond 24 months is generally seen as a strain on cash. Lower-priced consumer products often target a few months. The right range depends on churn: payback only matters if customers stay longer than it takes.

How does CAC relate to customer lifetime value?

Lifetime value is the gross profit a customer brings over the whole relationship. The LTV to CAC ratio compares the two; a ratio around 3 to 1 is a common benchmark. This page gives the CAC side and the payback period, which you can pair with your own lifetime value figure.

Should I use blended or paid CAC?

Blended CAC divides all spend by all new customers, including those who arrived organically. Paid CAC divides paid-channel spend by customers attributed to paid channels only. Blended is useful for overall efficiency; paid is better for deciding whether to raise ad budgets.

Why did my CAC jump this month?

Common causes are a new hire in sales whose salary arrived before their deals closed, a seasonal dip in sign-ups, rising ad auction prices, or a big one-off event cost. Looking at a rolling three-month average smooths out these timing effects.

Can I use this for a one-time purchase business?

Yes. CAC works the same way. For the payback figure, enter average gross profit per customer spread across a month, or simply compare CAC with the gross profit of the first order to see whether that order covers it.

Cite this tool

Using this tool in an assignment, article or report? Copy a citation, or a link for your website.

APA

Tools Directory Editorial Team. (2026, October 27). Customer Acquisition Cost. Tools Directory. Retrieved October 27, 2026, from https://tools.milunir.com/business/sales-and-conversion/customer-acquisition-cost/

MLA

Tools Directory Editorial Team. “Customer Acquisition Cost.” Tools Directory, 27 Oct. 2026, https://tools.milunir.com/business/sales-and-conversion/customer-acquisition-cost/. Accessed 27 Oct. 2026.

Chicago

Tools Directory Editorial Team. “Customer Acquisition Cost.” Tools Directory. Last modified October 27, 2026. Accessed October 27, 2026. https://tools.milunir.com/business/sales-and-conversion/customer-acquisition-cost/.

Link<a href="https://tools.milunir.com/business/sales-and-conversion/customer-acquisition-cost/">Customer Acquisition Cost – Tools Directory</a>