Blended Cost per Add to Cart: Cross-Platform ATC Efficiency

Blended Cost per Add to Cart measures how much you spend across all ad platforms to generate one add-to-cart event.

Formula

Blended Cost per Add to Cart = Blended Spend ÷ Blended Add to Carts

Formula Components

Metric	Definition
Blended Spend	Total advertising spend across all connected ad platforms
Blended Add to Carts	Total add-to-cart events attributed across all ad platforms

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

Example

Your store spent $15,000 across all ad platforms last month and generated 3,000 add-to-cart events.

Metric	Value
Blended Spend	$15,000
Blended Add to Carts	3,000
Blended Cost per Add to Cart	$5.00

How It Works

Blended Cost per Add to Cart divides your total advertising spend across Meta, Google, and TikTok by the total add-to-cart events attributed to those platforms. This gives you a unified view of how efficiently your combined ad spend drives cart actions, regardless of which platform generated them.

When to Use

Scenario	Action
Budget allocation	Compare blended cost per ATC against platform-specific costs to identify efficiency gaps
Funnel optimization	Track how cost per cart action changes relative to cost per purchase
Campaign scaling	Monitor if increased spend maintains efficient cost per cart action
Cross-platform benchmarking	Evaluate overall ad efficiency without platform-specific bias

Metric	Relationship
Blended Spend	Numerator — total ad spend across platforms
Blended Add to Carts	Denominator — total cart events across platforms
Blended Cost per Purchase	Downstream efficiency — cost to convert cart to purchase
Blended ROAS	Revenue efficiency — return on combined ad spend

See all Blended Conversions metrics →

Blended ATC Value Blended Initiate Checkouts

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​Formula

​Formula Components

​Example

​How It Works

​When to Use

​Related Metrics

Formula

Formula Components

Example

How It Works

When to Use

Related Metrics