CPA Calculator
Work out cost per acquisition from spend and conversions.
Calculate cost per acquisition (CPA) — how much you spend to win one customer or conversion. Enter your total spend and the number of conversions to get the CPA. Essential for judging whether a campaign is profitable against your margins. Runs fully in your browser — nothing is uploaded.
How to use CPA Calculator
Enter ad spend
Type the total advertising cost for your campaign into the free online CPA Calculator to begin working out your cost per acquisition instantly.
Add conversions
Enter the number of conversions that spend produced, whether sales, sign-ups or leads, so the calculator can divide cost by results accurately.
Get cost per acquisition
The CPA Calculator instantly divides total ad spend by conversions, showing the average amount you pay to win each conversion in real time.
Review the stats
Check the cost-per-acquisition headline alongside total spend and conversion count tiles to understand exactly where your advertising budget is going.
Compare to value
Weigh your CPA against the profit or lifetime value of a customer to confirm whether each campaign is genuinely profitable and worth scaling.
Share or reset
Share your CPA result via a link or reset the inputs to test new spend and conversion scenarios, free and fully in your browser.
Frequently asked questions
What is CPA?
CPA (cost per acquisition, sometimes cost per action) is the average spend needed to generate one conversion — a purchase, lead or sign-up.
What counts as a conversion?
Whatever you defined as the goal: a sale, a form submission, a call, an app install or a newsletter sign-up. Be consistent so the CPA is meaningful.
What is a good CPA?
A good CPA is any figure comfortably below the value (profit or lifetime value) of a customer. There’s no universal number — it depends entirely on your margins.
How do I calculate cost per acquisition (CPA)?
Use the CPA formula: divide your total ad spend by the number of conversions. For example, ₹10,000 spent for 25 conversions is ₹10,000 ÷ 25 = ₹400 CPA. This free CPA calculator works it out instantly.
What is the difference between CPA and CPC?
CPC (cost per click) is what you pay for each click, while CPA (cost per acquisition) is what you pay for each conversion. A campaign can have a low CPC but a high CPA if few clicks convert, so always track both.
How do I lower my cost per acquisition?
Improve targeting, raise your conversion rate with a better landing page, pause poor-performing keywords or audiences, and refine your ad creative. A higher conversion rate lowers CPA even when your cost per click stays the same.
What is a good CPA for my business?
A good CPA is comfortably below the profit or lifetime value a customer brings — there's no universal figure. If a customer is worth ₹2,000 in profit and your CPA is ₹400, the campaign is healthy. Compare your CPA against your margins rather than an industry benchmark.
What is the difference between CPA and CAC?
They're closely related: CPA (cost per acquisition) usually measures the ad cost per conversion in a specific campaign, while CAC (customer acquisition cost) is broader, including all marketing and sales spend divided by new customers. Use CPA to optimise ads and CAC for overall unit economics.
Is my data sent anywhere?
No. Everything is calculated in your browser with JavaScript — nothing you enter is uploaded.
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