New Customer MER: Acquisition Marketing Efficiency

New Customer MER measures what percentage of your new customer order revenue is spent on advertising. This is a key metric for understanding customer acquisition efficiency.

Formula

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

Formula Components

Metric	Definition
Total Ad Spend	Combined advertising spend across all connected platforms
New Customer Revenue	Total revenue from first-time buyer orders

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

Example

Your Shopify store generated $80,000 in new customer revenue while spending $40,000 on advertising.

Metric	Value	Calculation
Total Ad Spend	$40,000	All ad platforms
New Customer Revenue	$80,000	First-time buyers
NC MER	50%	($40,000 ÷ $80,000) × 100

A NC MER of 50% means you spend $0.50 on advertising for every $1 of new customer revenue.

How It Works

NC MER isolates marketing efficiency for customer acquisition. Since new customers typically cost more to acquire than returning customers to retain, NC MER is usually higher than overall MER. Comparing NC MER to total MER reveals how much your returning customers improve blended efficiency.

When to Use

Scenario	Action
Acquisition budget planning	Set target NC MER based on allowable CAC
Prospecting campaign evaluation	Compare NC MER across acquisition channels
LTV:CAC analysis	Ensure NC MER allows for profitable payback
Budget allocation decisions	Compare NC MER to RC MER for optimal split

Metric	Relationship
MER	Total MER including all customers
NC MER (Gross)	NC MER using gross revenue
NC MER (Net)	NC MER using net revenue
New Customer ROAS	Revenue-based efficiency (inverse metric)

See all Performance metrics →

⌘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