Cost Per Acquisition (CPA)

What is Cost Per Acquisition (CPA)?

Cost Per Acquisition measures how much you spend on average to acquire one customer or one conversion. It is calculated by dividing total marketing spend by the number of acquisitions in the same period. If you spent Rs 1,00,000 on Google Ads and acquired 25 paying customers, your CPA is Rs 4,000. CPA is the definitive measure of whether a paid marketing channel is profitable. A business selling a product with Rs 20,000 average order value can sustain a Rs 4,000 CPA comfortably. A business with Rs 3,000 average order value at the same CPA is losing money. This is why CPA must always be evaluated alongside Customer Lifetime Value (CLV). In Google Ads, "Target CPA" is a smart bidding strategy where Google's algorithm adjusts your bids automatically to try to achieve your specified CPA goal. This requires sufficient conversion data (Google recommends at least 30-50 conversions per month) to work effectively. CPA differs from Cost Per Click (CPC) in that CPC measures the cost of a click, while CPA measures the cost of a completed business action. CPA can be reduced by improving conversion rates on landing pages, tightening audience targeting to reach only high-intent users, optimising ad copy to filter out low-quality clicks, and improving Quality Score to reduce CPC. The relationship between CPA and CLV defines the maximum you can profitably spend to acquire a customer.