CPA Calculator – Cost Per Acquisition

Calculate your cost per acquisition (CPA) to measure paid advertising efficiency. Free CPA calculator with conversion rate analysis.

Last updated: 2026-03-09

Cost per acquisition calculator

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How CPA Is Calculated

Cost Per Acquisition (CPA) measures how much you spend in advertising to gain one customer or conversion. The formula is simple:

CPA = Total Ad Spend ÷ Number of Conversions

A lower CPA means you're acquiring customers more efficiently. To improve CPA, you can optimise ad targeting, refine your landing pages, or improve your conversion funnel. Industry benchmarks vary widely — e-commerce CPA may be $10–$45, while B2B SaaS can range from $50 to $200+.

CPA is closely related to ROAS (Return on Ad Spend) and CAC(Customer Acquisition Cost). While CPA focuses on a single campaign, CAC includes all marketing and sales costs over a period.

Frequently Asked Questions

What is a good CPA?

A good CPA depends on your industry and margins. E-commerce averages $10–$45, SaaS $50–$200, and B2B services $100–$500. The key metric is whether your CPA is below your profit per customer.

What is the difference between CPA and CAC?

CPA measures the cost of a single conversion from a specific campaign. CAC (Customer Acquisition Cost) is broader — it includes all marketing and sales expenses divided by total new customers over a period.

How do I lower my CPA?

Improve ad targeting, test different creatives, optimise landing pages for conversions, use retargeting, and refine audience segments. A/B testing each element can significantly reduce CPA over time.

Should I track CPA or ROAS?

Track both. CPA tells you acquisition cost efficiency, while ROAS tells you revenue generated per ad dollar. Together they give a complete picture of campaign performance and profitability.

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Disclaimer

CPA calculations are based on the ad spend and conversion data you provide. Actual acquisition costs may vary depending on attribution models and campaign structures.

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