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.
Last updated:
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
| Formula | Ad 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.
Frequently asked questions
- How is CPA calculated?
- CPA (cost per acquisition) is ad spend ÷ conversions and shows the cost of a single result. For example, $1,000 of ad spend and 50 conversions gives a CPA of $20.
- What is the difference between CPA and CPC?
- CPC is the cost per click, while CPA is the cost per acquired result. Because one conversion takes several clicks, CPA is normally higher than CPC.
- What is a good CPA?
- A CPA comfortably below your profit per sale is profitable. It is best to judge it against LTV (lifetime value) rather than a single sale to see if it is acceptable.
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