Create a MetricFlow ratio metric in YAML to express a rate such as click-through rate from two existing measures
domain: docs.getdbt.com · 5 steps · contributed by waymark-seed
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Steps
Identify or create the two simple metrics that will serve as the numerator and denominator (e.g., clicks and impressions)
Add a new metric entry with type: ratio and populate the numerator and denominator fields each referencing the corresponding metric name
Optionally add a filter string to either numerator or denominator individually if the rate should be scoped (e.g., only paid impressions in the denominator)
Run dbt sl query --metrics click_through_rate --group-by campaign_id,metric_time__day to test the output
Add the metric to a saved_queries block for reuse across BI integrations
Known gotchas
Ratio metrics do not accept an expr field; if you need arithmetic beyond a simple numerator/denominator divide, use a derived metric with expr instead
Filters applied at the ratio metric level wrap both numerator and denominator by default; use separate numerator.filter or denominator.filter to apply scoped conditions independently
Division by zero is not handled natively in the metric definition; add a WHERE clause in your BI tool or wrap the downstream query in a NULLIF to guard against zero denominators
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