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Cost Per Acquisition (CPA) Calculator

Enter your ad spend and number of conversions to instantly calculate your cost per acquisition (CPA). Add a target CPA to see how many conversions the same budget could buy and whether you are hitting your goal.

Input

$
conv.
$

Your target cost per acquisition. Enter it to see how many conversions the current ad spend could buy.

Result

Cost per acquisition (CPA)

$5,000.00

Cost to acquire one conversion

Ad spend

$300,000.00

Conversions

60 conv.

CPA

$5,000.00

FormulaAd spend ÷ Conversions
Breakdown$300,000.00 ÷ 60 conv.
Cost per acquisition (CPA)$5,000.00 / conv.
Target CPA$4,000.00 / conv.
Conversions affordable at target CPA (same spend)75 conv.

Your current CPA ($5,000.00) exceeds the target CPA ($4,000.00).

How it works

  • CPA (cost per acquisition) is calculated as "ad spend ÷ conversions". It represents the cost of generating a single result.
  • For example, $1,000 of ad spend producing 50 conversions gives a CPA of 1,000 ÷ 50 = $20.
  • A lower CPA means you are acquiring results more cost-efficiently. If your CPA is comfortably below the profit per sale, the campaign is profitable.
  • Enter a target CPA to also see how many conversions your current ad spend could buy at that rate (ad spend ÷ target CPA).
  • Keep the definition of a conversion (purchase, sign-up, inquiry, etc.) and the measurement period consistent when comparing.
  • An acceptable CPA depends on your product's price and margin. It is best to judge it against LTV (lifetime value) to decide whether it falls within an acceptable range.