Google Ads CPA Calculator
Calculate your Google Ads CPA (cost per acquisition) and compare it to customer lifetime value to gauge profitability.
Free · No signup · Updated June 2026
Your numbers
Results
Estimates for planning only. Your real results depend on audience, creative, and market conditions.
What it measures
Google Ads CPA (cost per acquisition) is the average cost to win one customer or conversion, calculated by dividing ad spend by conversions.
Formula
CPA = Ad spend ÷ Conversions · LTV : CPA = Lifetime value ÷ CPA
Worked example
$2,500 of spend for 45 conversions is a $55.56 CPA, and against a $300 lifetime value that's a healthy 5.4:1 LTV:CPA ratio.
Typical benchmarks
- Healthy LTV:CPA ratio
- 3:1+
- Avg. Search CPA
- $40-$60
- Break-even
- CPA = LTV
How this calculator works
CPA = ad spend ÷ conversions. The LTV:CPA ratio shows how much value each acquisition returns relative to its cost — a healthy target is 3:1 or higher.
Frequently asked questions
What's a good CPA? +
A good CPA is one comfortably below your customer's value. Many businesses aim for an LTV:CPA ratio of at least 3:1.
How do I lower CPA? +
Improve conversion rate, raise Quality Score, cut wasted spend with negatives, and use Target CPA Smart Bidding once you have conversion data.
What is the difference between CPA and CPC? +
CPC is the cost of a single click; CPA is the cost of a completed conversion. CPA = CPC ÷ conversion rate, so it depends on both bid and landing-page performance.
What is Target CPA bidding? +
Target CPA is a Smart Bidding strategy where you set a desired cost per conversion and Google adjusts bids automatically to hit that average.
How many conversions do I need for Target CPA? +
Google recommends at least 15-30 conversions in the last 30 days so the algorithm has enough data to bid reliably toward your target.
Need a custom Google Ads tool, not a generic calculator?
This free google ads cpa calculator gets you a number. If you want it wired to your live ad data, GlitchFi builds custom marketing calculators, dashboards, and internal tools, plus full MVPs, with a forward-deployed engineer on your team. Fixed price, 30 days, and you pay nothing if we're late. You own all the code.
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