CPA Calculator
Free CPA calculator for performance marketers. Instantly compute cost per acquisition, benchmark it against your industry, and compare CPA across Google Ads, Meta Ads, TikTok and every lead-gen or ecommerce channel.
What is CPA?
CPA (cost per acquisition) is the average amount a paid campaign pays to generate one conversion — a sale, lead, signup, install or booking. Unlike CPC, which only prices the click, CPA prices the outcome the business actually cares about.
Why CPA matters
CPA is the bridge between media buying and profit. Compare CPA against gross margin per order (for ecommerce) or against target CAC (for SaaS and lead-gen) to decide whether a channel is scalable, break-even or losing money.
CPA formula and how to calculate it
CPA = Total Ad Spend ÷ Total Conversions. Example: $1,500 spent on a Meta Ads campaign that produced 30 purchases equals a CPA of $50. Use the calculator above to model your own spend and conversion volume.
CPA vs CPC vs CPM
CPM prices reach, CPC prices clicks, CPA prices conversions. Mathematically, CPA = CPC ÷ conversion rate, so a great CPC combined with a weak landing page still produces a poor CPA.
Industry CPA benchmarks (2026)
- Ecommerce: $25 – $60
- DTC subscriptions: $30 – $80
- B2B lead-gen: $40 – $150
- SaaS free trials: $80 – $200
- Insurance & finance: $200 – $500+
- Mobile app installs: $1 – $10
How to lower CPA
- Lift landing-page conversion rate.
- Improve Quality Score to lower your CPC.
- Exclude low-performing placements, audiences and keywords.
- Use target CPA or maximize-conversions smart bidding.
- Match ad copy to landing page copy to lift CTR and post-click intent.
Common CPA mistakes
- Judging CPA before conversions have full attribution windows.
- Comparing CPA across channels without normalizing conversion definitions.
- Optimizing to lowest CPA and missing volume ceilings.
- Ignoring LTV — a higher CPA is fine if lifetime value covers it.
CPA Calculator FAQ
What is CPA in digital marketing?
CPA (cost per acquisition) is the amount an advertiser pays for each completed conversion attributed to a paid campaign — a purchase, lead, signup or install.
What is the CPA formula?
CPA = Total Ad Spend ÷ Total Conversions.
What is a good CPA for Google Ads?
Ecommerce averages $30–$60, B2B lead-gen $40–$150, and high-value verticals like SaaS and finance $200+ per conversion.
How is CPA different from CPC?
CPC prices a click, CPA prices a conversion. CPA = CPC ÷ conversion rate.
How can I lower my CPA?
Lift landing page conversion rate, tighten targeting, exclude weak placements and use target-CPA smart bidding.
What is target CPA bidding?
A Google Ads smart-bidding strategy that automatically sets bids to hit an average cost per conversion you specify.
Is CPA the same as CAC?
No. CPA is per conversion inside a campaign; CAC is total sales and marketing cost divided by new customers, across every channel.