Define the reach metric
Choose the time period
Identify the audience source
Count unique people exposed
Exclude duplicate exposures
Separate organic and paid reach
Measure by platform
Measure by campaign
Measure by content piece
Use analytics tools
Verify cross-device deduplication
Compare reach to impressions
Segment by geography
Segment by demographics
Segment by audience type
Track reach trends over time
Validate with third-party data
Report total reach and unique reach