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analytics-dictionary / term / tracking & measurement

Custom metric

A custom metric is a numeric value you register in your analytics tool, such as a score, a duration or a count.

Written by Reflective Data experts · updated Oct 5, 2026

Like custom dimensions, event parameters must be registered before reports can aggregate them. Custom metrics are useful for business-specific measures that standard metrics do not cover.

Remember the unit and aggregation, since GA4 will sum or average depending on the metric type.

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Custom dimensionEventEvent parameter

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