What Actually Drives YouTube Engagement? (3,500-Video Study)

I pulled engagement data on 37 YouTube channels across 7 niches. 3,536 long-form videos total. No Shorts. The goal was to figure out what actually drives engagement, and whether likes and comments are telling you the same story.

Spoiler: they're not.

Engagement is one of those words that gets thrown around so loosely it's almost meaningless. So let me be specific. In this analysis, engagement means two things: like-to-view ratio (likes per 100 views) and comment-to-view ratio (comments per 100 views). Simple maths. Surprisingly revealing.

1. Engagement By Niche

Not all niches engage the same way. Some get people to tap the thumbs-up. Others get people to type. The difference matters more than you'd think.

Like-to-view ratio by niche

Self-development wins the like race. Makes sense. Content that makes people feel something (purpose, motivation, a sense of being understood) earns the low-effort signal of approval. A like is a nod. Self-dev content is built for nods.

And yet the comment chart tells a completely different story.

Comment-to-view ratio by niche

Business content dominates comments. The reason is structural: business videos tend to feature opinions, debate, and takes that people want to respond to. Comments require friction. You have to stop, think, type. That only happens when content triggers a reaction stronger than "nice video."

The thing about health content is that it's informational. People watch, learn, leave. They liked it. They just didn't feel compelled to tell you about it. Health has the highest like-to-comment ratio in the dataset: 33.5 likes for every comment. Business sits at 10.7.

Different niches, different engagement signatures. Neither is better. But knowing which one yours produces changes how you read your analytics.

2. Engagement vs Video Length

I bucketed every video by duration and looked at how like rate and comment rate shift as videos get longer. The pattern was clear, and a bit counterintuitive.

Like rate by duration

Shorter videos get liked more. A lot more. Under-5-minute videos pull a 4.98% like rate, compared to 2.23% for anything over an hour. The like is an impulse action, and short content catches people in that impulse window.

But comments? Different picture entirely.

Comment rate by duration

The sweet spot for comments is 15 to 20 minutes. Long enough to develop an argument that people want to respond to. Short enough that they still have the energy to do it.

Sub-5-minute videos sit dead last for comments (0.08%). On paper it looks like they're the most "engaging" because of that 4.98% like rate. But the engagement is shallow. People watched, tapped, moved on. No conversation.

If you want people talking in your comments section, you need to give them enough to chew on. That takes time.

3. The Most Engaging Channels

Combined engagement rate (likes + comments as a percentage of views). Top 10:

Look at Captain Sinbad. 560K subscribers, sitting second on this list. Film Booth has 374K and makes the top 10. Meanwhile, channels with 5, 10, 20 million subs are nowhere near the top.

The thing about engagement rate is that it rewards connection over reach. Smaller channels often have tighter communities. The audience is there because they chose to be, not because an algorithm dropped them in. That intimacy shows up in the numbers.

Vsauce is the exception that proves the scale-can-still-engage rule. 24.7 million subscribers and a 6.75% engagement rate. But Vsauce publishes rarely (28 videos in our dataset), and every video is an event. Scarcity creates anticipation. Anticipation creates engagement.

4. Likes vs Comments: Are They the Same Signal?

Short answer: no.

The Pearson correlation between like rate and comment rate across all 3,536 videos is 0.32. That's moderate at best. It means a video that gets heavily liked is only slightly more likely to get heavily commented on.

The quartile breakdown makes it clearer:

Likes triple from bottom to top quartile (2.16% to 6.20%). Comments only double (0.19% to 0.38%). They move in the same direction, but at completely different speeds.

This matters because a lot of creators treat engagement as one thing. "My engagement is good" or "my engagement is bad." But a video can be high-like, low-comment (feel-good content that doesn't invite discussion) or low-like, high-comment (controversial takes that spark debate but don't earn broad approval).

They're different signals, driven by different content. A like is a reflex. A comment is a decision.

5. So What Do You Do With This?

Four things worth sitting with:

• Know which engagement you're optimising for. Likes and comments are different actions driven by different content. If you want comments, you need opinion, debate, open questions. If you want likes, you need emotional resonance and brevity. Chasing both at once usually gets you neither.
• Your niche has an engagement signature. Health content gets liked but not discussed. Business content gets debated but not passively approved. Understanding your niche's natural engagement pattern saves you from chasing a benchmark that doesn't apply to you.
• Video length is a lever. Short videos (under 5 min) maximise like rate. Mid-length videos (15-20 min) maximise comment rate. If you're making 30-minute videos and wondering why comments are low, the length itself might be the issue.
• Smaller channels can win on engagement. You don't need millions of subscribers to be at the top of the engagement chart. Tight communities, personal content, and genuine connection outperform raw scale. That's not a consolation prize. It's an actual advantage.

Want to see where your channel's engagement sits relative to others? The Channel Audit tool breaks down your like rate, comment rate, and overall engagement alongside benchmarks. Worth a look.

Methodology

I'm Becky Isjwara, content strategist and the gal behind youtubeproducer.app. If you're looking for help with your online branding and content strategy, let's have a chat.