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Customer Acquisition Budget Calculator

Size your acquisition budget from a customer goal and CAC.

How it is calculated

The tool works backwards from a growth goal to a spend figure: total budget = target new customers × CAC. CAC is the cost of acquiring one customer in dollars (marketing and sales spend divided by customers won), and the target is a number of new customers. It then divides by twelve to give monthly budget = total ÷ 12, and repeats the CAC as the cost per customer.

Both inputs must be zero or more; a target of 0 gives a $0.00 budget. The monthly figure always divides by 12, so it only makes sense when the target covers a full year and you spend evenly. For a quarter or a launch period, use the total instead. The tool assumes CAC stays the same as you scale, but in practice cheaper channels run out first and CAC tends to rise with volume.

Worked example

A subscription app wants 1,800 new paying customers this year and has measured a CAC of $46.50. Total budget = 1,800 × 46.50 = $83,700.00. Spread over twelve months that is 83,700 ÷ 12 = $6,975.00 a month. If you expect CAC to climb to $55 as you scale, the same target would need 1,800 × 55 = $99,000, which shows why a margin above the current CAC is worth planning.

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Common mistakes

  • Using cost per click or cost per lead as CAC. CAC is the cost per paying customer, so divide total spend by customers won, not by clicks.
  • Leaving out sales salaries, tools and agency fees when working out CAC, which makes the budget too small.
  • Reading the monthly figure as a quarterly or launch budget. It is always the total divided by 12.
  • Entering a customer target as total customers rather than new customers to be acquired.
  • Assuming CAC stays flat at higher volume. Costs usually rise as the cheapest channels saturate.

Sources

About this calculator

Once a business knows its customer acquisition cost (CAC) — the average marketing and sales spend required to win one paying customer — it can work backward from a customer growth goal to a required budget, simply by multiplying the target number of new customers by CAC. This is the standard way marketing and growth teams turn a headcount or revenue goal into a spend number finance can approve.

Multiply the number of new customers you want by what each one costs to win, and you have the acquisition budget the goal requires, a starting point for splitting spend across channels or testing whether a growth target fits the money you have.

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Comments (1)

  • Editorial team

    Treat the budget as a ceiling to test, not a forecast. Before approving it, compare the total with what your current channels can realistically absorb: if one channel supplies most of your customers today, tripling spend there rarely triples customers. The monthly line is a flat twelfth, so a seasonal business should reshape it by hand. How do you handle CAC drift when a target is much larger than last year's?

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