Blended CPA: Cost Per Acquisition Across All Channels

Blended CPA measures the average cost to acquire each purchase conversion across all your advertising channels combined.

Formula

Blended CPA = Blended Spend ÷ Blended Purchases

Formula Components

Metric	Definition
Blended Spend	Total advertising spend across all connected platforms
Blended Purchases	Total attributed purchase conversions across all channels

Metadata
Type	Currency
Data Source	Meta Ads, Google Ads, TikTok Ads
Aggregation	Ratio

Example

Your store spent $12,500 across all advertising channels in March and generated 250 attributed purchases.

Channel	Spend	Purchases	Channel CPA
Meta	$6,000	150	$40.00
Google	$4,000	70	$57.14
TikTok	$2,500	30	$83.33
Blended	$12,500	250	$50.00

How It Works

Blended CPA aggregates total spend and total attributed purchases from all connected ad platforms, then calculates the average cost per conversion. This gives you a single efficiency metric across your entire paid media mix rather than evaluating each channel separately.

When to Use

Scenario	Action
Setting overall acquisition targets	Compare blended CPA to customer lifetime value
Budget allocation decisions	Identify if total spend is generating efficient conversions
Monthly performance reviews	Track acquisition cost trends across all channels
Scaling paid media	Monitor if efficiency holds as you increase total spend

Metric	Relationship
Blended Spend	Numerator — total ad spend across platforms
Blended Purchases	Denominator — total attributed purchases
Blended ROAS	Inverse efficiency metric measuring revenue return

See all Blended Efficiency metrics →

Blended ROAS Blended NC ROAS

⌘I

​Formula

​Formula Components

​Example

​How It Works

​When to Use

​Related Metrics

Formula

Formula Components

Example

How It Works

When to Use

Related Metrics