CPA Calculator
CPA ties spend directly to outcomes, making it the metric closest to profitability. Keep CPA below the value of a conversion to stay profitable. 100% free, runs in your browser — no sign-up.
Cost per acquisition (CPA)
$50.00
Formula
CPA = Ad Spend ÷ Conversions
Example
Spend $1,000 for 20 conversions → CPA = $1,000 ÷ 20 = $50.00.
Learn more: What is CPA? →
👉 Compare your number: how to lower your CPA →
Frequently Asked Questions
- How do you calculate CPA?
- CPA = total ad spend ÷ number of conversions. $1,000 spent for 20 conversions is a $50 CPA. Define "conversion" consistently (lead, sale, sign-up) when comparing campaigns or benchmarks.
- What is a good CPA?
- A good CPA is simply one below what a conversion is worth to you. If a new customer is worth $120 in gross profit, any CPA under $120 is profitable. Work out your break-even CPA first, then judge benchmarks against it.
- How can I lower my CPA?
- CPA = CPC ÷ conversion rate, so you can attack either side: cheaper clicks (better Quality Score, negative keywords, long-tail terms) or a higher conversion rate (landing page message-match, fewer form fields, stronger proof near the CTA).
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