Engagement rate is the one number that tells you whether people actually reacted to a video, not just whether it was served to them. On YouTube it is simple to calculate and easy to get wrong, because there are two ways to measure it and they give very different answers.
The formula
Passive Array measures YouTube engagement by views:
Engagement rate = (likes + comments) / views x 100
For a channel, the tools average likes, comments and views over the last 10 uploads first, then apply the same formula. That smooths out one viral video or one flop.
The other common method divides by subscribers instead of views. It is useful for a different question (how much of the audience that opted in still shows up), but it punishes channels that get most of their views from search and recommendations, which today is most channels. So the grade you see in the tools and in the Chrome extension is always the by-views number.
The scale
| Engagement by views | Grade |
|---|---|
| Under 1% | Low |
| 1% to 2% | Below average |
| 2% to 4% | Average |
| 4% to 6% | Good |
| Above 6% | Excellent |
The same scale is used on every YouTube tool on this site and in the Passive Array for YouTube extension, so a grade on a video page and a grade on a channel report mean the same thing.
Why the numbers are small
A 4% engagement rate sounds low if you are used to Instagram, where likes are one tap away and the typical rate for a small account is around 4% of followers. On YouTube a "like" requires the viewer to stop, find the button and click, and most viewers never do. Comments are rarer still. A video where one in twenty viewers likes it is doing well.
What pulls the number down
- Very large view counts. Views from browse and Shorts feeds bring in people who were not looking for you. They watch, they leave. A video that goes far beyond the channel's usual audience almost always has a lower engagement rate than the channel's normal videos, even when it is a success.
- Long-tail search traffic. Tutorials keep collecting views for years from people who want the answer and close the tab. High value, low engagement.
- Comments turned off. Half the formula disappears.
What pushes it up
- A small, loyal audience. Channels under 10K subscribers routinely post 5% to 10% because nearly every viewer is a fan.
- Asking. A specific ask ("tell me in the comments which one you picked") measurably lifts comments. A generic "like and subscribe" does not.
- Shorts. Short videos usually run two to three times the engagement rate of long videos on the same channel because the like button is on screen the whole time. The tools flag Shorts so you do not compare them with long-form directly.
How to use the grade
Compare a channel with itself over time, and compare channels of similar size and format. A 1.5% rate on a 2M-subscriber tech channel with 800K views per video is normal. A 1.5% rate on a 5K-subscriber vlog is a warning sign. The quality checker on this site weights engagement alongside views per subscriber, upload frequency and channel age for exactly this reason.
If you want the number for a specific video rather than a channel, the Chrome extension shows it in the sidebar on every watch page, with the grade and the tags the creator used.