New Customer MER: First-Order Marketing Efficiency

New Customer MER measures what percentage of new customer order revenue is spent on advertising—marketing efficiency for customer acquisition.

Formula

NC MER = ( Ad Spend ÷ NC Order Revenue ) × 100

Formula Components

Metric	Definition
Ad Spend	Total advertising spend
NC Total Revenue	Revenue from new customer orders
customer_type = new_customer	Filters to first-time buyers

Metadata
Type	Percentage
Data Source	Shopify, Meta Ads, Google Ads
Aggregation	Ratio

Example

Your store spent $20,000 on ads and new customers generated $80,000 in revenue.

Component	Value	Calculation
Ad Spend	$20,000	Total advertising
NC Revenue	$80,000	First-time buyer revenue
NC MER	25%	$20,000 ÷ $80,000 × 100

How It Works

NC MER shows marketing efficiency specifically for customer acquisition. A 25% NC MER means 25% of new customer revenue goes to advertising. Compare against RC MER to see how much more efficient repeat customers are.

When to Use

Scenario	Action
Measuring acquisition efficiency	Track NC MER to optimize acquisition spend
Comparing customer segments	NC MER vs RC MER shows retention value
Setting CAC targets	NC MER helps determine sustainable acquisition costs
Channel optimization	Compare NC MER across acquisition channels

Metric	Relationship
MER	Overall marketing efficiency ratio
RC MER	MER for returning customers
CAC	Cost to acquire new customers

See all Performance metrics →