Cost per Repeat Purchase: Returning Customer Acquisition Cost

Cost per Repeat Purchase measures how much ad spend is required to generate one purchase from a returning customer.

Formula

Cost per Repeat Purchase = Channel Spend ÷ Repeat Purchase Events

Formula Components

Metric	Definition
Channel Spend	Total advertising spend across all connected ad platforms
Repeat Purchases	Total purchase events from returning customers tracked by the Upstack Pixel

Metadata
Type	Currency
Data Source	Upstack Pixel
Aggregation	Ratio

Metric	Value	Calculation
Channel Spend	$15,000	Total ad spend
Repeat Purchases	750	Returning customer orders
Cost per Repeat Purchase	$20.00	$15,000 ÷ 750

Metric

Value

Calculation

Channel Spend

$15,000

Total ad spend

Repeat Purchases

750

Returning customer orders

Cost per Repeat Purchase

$20.00

$15,000 ÷ 750

How It Works

The Upstack Pixel tracks every purchase event and identifies whether the customer has previously purchased from your Shopify store. Repeat purchases are orders placed by customers who have at least one prior order. This metric divides your total ad spend by the count of repeat purchase events to show your cost efficiency for returning customer conversions.

When to Use

Scenario	Action
Comparing new vs. returning customer acquisition costs	Compare against Cost per New Customer Purchase to optimize budget allocation
Evaluating retention campaign efficiency	Monitor whether retargeting campaigns deliver cost-effective repeat purchases
Budgeting for customer reactivation	Use as a baseline for setting CPA targets on win-back campaigns
Analyzing channel performance by customer type	Break down by channel to find which platforms drive efficient repeat purchases

Metric	Relationship
Repeat Purchases	The denominator in this calculation
Cost per New Customer Purchase	Compare acquisition cost for first-time buyers
Cost per Purchase	Overall purchase cost regardless of customer type
Channel Spend	The numerator in this calculation

Metric

Relationship

Repeat Purchases

The denominator in this calculation

Cost per New Customer Purchase

Compare acquisition cost for first-time buyers

Cost per Purchase

Overall purchase cost regardless of customer type

Channel Spend

The numerator in this calculation

METRICS

Cost per Repeat Purchase: Returning Customer Acquisition Cost

Formula

Formula Components

Example

How It Works

When to Use

​Formula

​Formula Components

​Example

​How It Works

​When to Use

​Related Metrics

Formula

Formula Components

Example

How It Works

When to Use

Related Metrics