Cost per Trial Extended: Extension Acquisition Cost

Cost per Trial Extended measures the average advertising spend associated with users who received trial extensions.

Formula

Cost per Trial Extended = Channel Spend ÷ Trial Extended

Formula Components

Metric	Definition
Channel Spend	Total advertising spend across all channels
Trial Extended	Count of trial extension events

Metadata
Type	Currency
Data Source	Upstack Pixel
Aggregation	Ratio

Example

Your SaaS company spent $25,500 on acquisition in August, resulting in 340 trial extensions.

Acquisition Channel	Spend	Extensions	Cost/Extension
Google Ads	$10,000	120	$83.33
Meta	$8,000	110	$72.73
LinkedIn	$5,000	70	$71.43
Referrals	$2,500	40	$62.50
Total	$25,500	340	$75.00

How It Works

The metric divides total advertising spend by the number of trial extension events. This helps understand the acquisition cost for users who needed more evaluation time. Combined with extension conversion rates, it reveals the true cost of nurturing hesitant prospects.

When to Use

Scenario	Action
Evaluate extension ROI	Compare cost to conversion value
Identify channel quality	High extension rates may indicate poor fit
Budget retention efforts	Understand cost of extended evaluation
Optimize trial duration	Compare against standard trial costs

Metric	Relationship
Trial Extended	The denominator in this calculation
Trial Extended Value	Revenue to compare against cost
Cost per Trial Started	Standard trial acquisition cost

See all Funnel Conversion metrics →