GA4 Custom Dimensions and Metrics Guide
Create custom dimensions and metrics in GA4 to track business-specific data. Extend GA4's measurement capabilities.
Custom Definitions in GA4
Custom dimensions and metrics let you track data specific to your business that isn't captured by default.
Custom Dimensions
Dimensions are attributes of users or events. Create custom dimensions for data like membership level, content category, or user type.
Dimension Scope
GA4 supports two scopes: event-scoped (applies to specific events) and user-scoped (applies to all events for a user).
Custom Metrics
Metrics are quantitative measurements. Create custom metrics for values like points earned, items in cart, or engagement score.
Implementation
Send custom data as event parameters, then register them as custom dimensions or metrics in GA4 settings.
Limits and Quotas
GA4 allows 50 custom event-scoped dimensions, 25 user-scoped dimensions, and 50 custom metrics per property.
Naming Conventions
Use clear, descriptive names. Follow a consistent naming pattern across your organization.
Use Cases
- Track custom user attributes
- Measure business-specific metrics
- Segment users by custom criteria
- Analyze custom event properties