Engagement Rate vs Reach
Engagement rate measures reactions relative to a denominator. Reach measures how many unique people saw content. They are related, but not interchangeable.
Calculate engagement rateWhat engagement rate answers
Engagement rate helps answer whether people interacted with content. Depending on the formula, the denominator may be followers, views, impressions, or reach.
What reach answers
Reach helps answer how many unique people saw content. It is often only available to the account owner inside official platform analytics.
Use both when possible
High reach with low engagement may mean broad but weak interest. Lower reach with strong engagement may signal a focused audience. Public tools may only show partial data.