Meta Start Trials: Free Trial Sign-ups from Ads

Counts how many people started a free trial after engaging with your Meta ad—an early indicator of subscription conversion potential.

Formula

Meta Start Trials = COUNT ( trial_start events )

Formula Components

Metric	Definition
trial_start events	Each free trial initiation attributed to your Meta ads within the attribution window

Metadata
Type	Number
Data Source	Meta Ads
Aggregation	Count

Example

Your SaaS company ran a prospecting campaign in March, generating 847 trial starts across ad sets.

Ad Set	Trials Started	Cost per Trial
Lookalike - High Value	312	$8.42
Interest - Small Business	285	$11.67
Retargeting - Site Visitors	250	$5.23

How It Works

Meta fires a StartTrial event when a user initiates a free trial on your site or app. This event is captured via the Meta Pixel or Conversions API and attributed to the ad that influenced the conversion within your attribution window.

When to Use

Scenario	Action
Subscription model launch	Track trial volume as your primary top-of-funnel metric
Campaign optimization	Compare trial rates across audiences to find high-intent segments
Budget allocation	Shift spend toward ad sets with lower cost per trial
Funnel analysis	Pair with subscriptions to calculate trial-to-paid conversion rate

Metric	Relationship
Meta Cost per Start Trial	Average spend required to generate one trial start
Meta Subscriptions	Completed subscriptions—tracks trial-to-paid conversion
Meta Spend	Total ad spend used to calculate cost per trial

See all Meta Conversions metrics →

Meta Subscribes Meta Contacts

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​Formula

​Formula Components

​Example

​How It Works

​When to Use

​Related Metrics

Formula

Formula Components

Example

How It Works

When to Use

Related Metrics