Meta Cost per Purchase: Track Ad Acquisition Cost

Meta Cost per Purchase measures how much you spend on average for each purchase attributed to your Meta ads.

Formula

Meta Cost per Purchase = Meta Spend ÷ Meta Purchases

Formula Components

Metric	Definition
Meta Spend	Total amount spent on Meta advertising
Meta Purchases	Number of purchases attributed to Meta ads

Metadata
Type	Currency
Data Source	Meta Ads
Aggregation	Ratio

Example

Your skincare brand spent $2,450 on Meta ads in March and drove 98 purchases.

Metric	Value	Insight
Ad Spend	$2,450	Total Meta budget consumed
Purchases	98	Orders attributed to Meta
Cost per Purchase	$25.00	Average acquisition cost

How It Works

Meta tracks purchases using pixel events and Conversions API data. When a user who saw or clicked your ad completes a purchase within the attribution window, Meta credits that sale to the campaign. This metric divides your total spend by those attributed purchases.

When to Use

Scenario	Action
Compare campaign efficiency	Lower cost per purchase = more efficient spend
Set target acquisition costs	Benchmark against your average order value
Identify underperforming ads	Pause ads with cost per purchase above target
Scale profitable campaigns	Increase budget on ads with low acquisition costs

Metric	Relationship
Meta Purchases	The denominator in this calculation
Meta Spend	The numerator in this calculation
Meta CPA	Alternative name for cost per acquisition