SocialAgentEngagement rate is the most quoted and least specified metric in social media. There are three common formulas, they produce very different numbers from the same post, and published benchmarks rarely say which one they used.
The three formulas
By reach
(interactions ÷ accounts reached) × 100
The honest measure for a single post: of the people who saw this, how many responded. Use it to judge content. It is the highest of the three numbers, because reach is smaller than impressions.
By impressions
(interactions ÷ impressions) × 100
The most conservative, because one person seeing a post three times counts three times. Useful for paid comparisons where impressions are what you bought.
By followers
(interactions ÷ followers) × 100
The one brands and media kits use, and the only one comparable across accounts — because followers are public and reach is not. It says as much about how well the platform distributes you as about the post itself.
What counts as an interaction
Likes, comments, shares and saves. Include shares and saves: they carry more ranking weight than likes on every current platform, because they signal value rather than approval. A post with 40 likes and 60 saves is doing far better than one with 300 likes and 4 saves.
Realistic benchmarks (by followers)
| Account size | Weak | Normal | Strong |
|---|---|---|---|
| Under 10,000 | Below 1.5% | 1.5–3% | Above 3% |
| 10,000 – 100,000 | Below 1% | 1–2% | Above 2% |
| Above 100,000 | Below 0.5% | 0.5–1.5% | Above 1.5% |
The comparison that is actually useful
Your own median, over your last twenty posts. Use the median rather than the mean — one post that outperformed by 10× will drag an average somewhere meaningless.
Then read the two diagnostic cases:
- High reach, low engagement. The hook worked and the content did not deliver on it. Look at the promise in your first line.
- Low reach, high engagement. The content worked and distribution has not caught up. This is the pattern that precedes a post taking off. Do not delete it.
What not to do with it
Do not optimise engagement rate directly. It is trivially gamed — engagement-bait questions and "comment X for the link" both raise it while degrading the account. The metric is a diagnostic, not a target.
Get all three rates from one set of post metrics.
Engagement rate calculator →