New Customer CM3 ROAS: First-Order Contribution Margin ROAS

New Customer CM3 ROAS measures how much contribution margin (after all variable costs including ad spend) you generate from first orders per dollar of ad spend.

Formula

New Customer CM3 ROAS = New Customer CM3 ÷ Ad Spend

Formula Components

Metric	Definition
New Customer CM3	Contribution margin from first-time buyer orders
Ad Spend	Total advertising spend

Metadata
Type	Ratio
Data Source	Shopify, Advertising Platforms
Aggregation	Ratio

Example

Your Shopify store generates $7,000 CM3 from new customers and spends $15,000 on ads.

Component	Value	Calculation
New Customer CM3	$7,000	First-order contribution margin
Ad Spend	$15,000	Marketing cost
New Customer CM3 ROAS	0.47	$7,000 ÷ $15,000

How It Works

New Customer CM3 ROAS is often below 1.0 because first-order contribution margin already deducts the ad spend. This metric shows true acquisition profitability at the variable cost level.

Interpretation

Scenario	Meaning
CM3 ROAS > 0	First orders contribute positively
CM3 ROAS = 0	First orders break even on variable costs
CM3 ROAS < 0	First orders lose money on variable costs

First-order CM3 ROAS is typically low—repeat purchases drive profitability.

Metric	Relationship
New Customer CM3	Numerator (contribution margin)
CM3 ROAS	Overall CM3 ROAS
Returning Customer CM3 ROAS	Repeat order CM3 ROAS

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​Formula

​Formula Components

​Example

​How It Works

​Interpretation

​Related Metrics

Formula

Formula Components

Example

How It Works

Interpretation

Related Metrics