Glossary · Paid mediaTOFU
CPA (Cost Per Acquisition)
The short answer
CPA (Cost Per Acquisition) is the average ad spend required to produce one conversion — a purchase, sign-up, install or any other action you define. ₹1.5 lakh spent for 300 purchases is a ₹500 CPA.
In ad platforms, "Target CPA" is also a bidding strategy: you tell Google or Meta the average cost per conversion you're willing to pay and the algorithm bids accordingly.
CPA vs CAC vs CPL
- CPA — cost per any defined conversion, including repeat purchases
- CAC — cost per new customer, usually across all marketing spend
- CPL — cost per lead, a specific kind of CPA for lead generation
Setting a target CPA
Your maximum CPA for a purchase equals the contribution per order — the point where the ad cost uses up all the profit. Your target CPA should be below that, leaving room for the profit you want. For lead generation, work backwards from deal value and lead-to-sale conversion rate.
Mistakes
- Counting micro-conversions (add-to-cart, page views) in the CPA
- Setting a Target CPA so low the campaign can't spend
- Comparing CPA across campaigns that optimise for different actions
CPA example
A campaign spends ₹75,000 and generates 150 purchases: CPA = ₹500. If contribution per order is ₹700, each order adds ₹200 after ad spend. If contribution per order is ₹450, the campaign loses ₹50 per order despite a "good-looking" CPA. See contribution margin.
CPA in practice
A campaign spends ₹60,000 and produces 120 sign-ups: CPA is ₹500. If a sign-up is worth ₹800 in margin, the campaign is profitable.
How to lower CPA
- Improve conversion rates
- Refine targeting
- Refresh creative
- Use bid strategies aligned to conversions
Common CPA mistakes
- Setting CPA targets without margin data
- Counting low-quality conversions
- Comparing CPA across different conversion definitions
Frequently asked questions
What's a good CPA?
One below your contribution per conversion, with room for profit. There's no universal benchmark.
Why did my CPA jump after I changed the target?
Large target changes can reset learning. Adjust Target CPA in steps of roughly 10–20%.
Should we use Target CPA bidding?
Once a campaign has steady conversion volume and accurate tracking, target CPA can work well. Set realistic targets based on recent performance.
What's the difference between CPA and CPL?
CPL is CPA where the action is a lead. See CPL.
Is CPA the same as CAC?
Not always — CPA can measure any action, while CAC refers to acquiring a customer.
What is target CPA bidding?
A Google Ads strategy that sets bids to achieve an average cost per conversion.
How do we set a target CPA?
From the margin a conversion is worth and how many conversions you need.
Related terms
Full glossaryDo the maths
Run your numbers before you spend a rupee.
Our free calculators turn margins, AOV and conversion rates into the targets that actually matter: break-even ROAS, affordable CAC and budget per stage.