Benchmark
Completion rate is the share of viewers who make it to the end of your video. It's the clearest signal of whether your ad holds attention the whole way through — and the drop-off curve behind it tells you exactly where you're losing people.
Completion rate = completed views ÷ total views × 100. Most platforms also give you quartile data — the share who watched 25%, 50%, 75%, and 100% — and those four points draw a drop-off curve. Where the curve falls steeply is where your ad is losing the room.
These fall sharply with length — the single biggest driver. Compare only against videos of similar length and placement.
| Type | Average | Strong |
|---|---|---|
| Short (< 15s), social | 15–30% | 40%+ |
| Mid (15–30s), social | 8–15% | 20%+ |
| Long (30–60s), social | 4–10% | 15%+ |
| YouTube skippable in-stream | 10–20% | 30%+ |
A single completion percentage hides the story; the shape of the curve reveals it. A cliff at second 2 is a hook problem; a slow bleed through the middle is a pacing problem; a drop right before the CTA means you lost them before the ask. Reading it is exactly how to read an attention curve — and it's why where TikTok ads lose attention matters more than the final number.
Completion rate is a post-spend metric — you buy the views, then learn where they left. Predicting the second-by-second attention curve from the creative itself shows you the drop-off point in advance, so you can fix the slow stretch before launch. See ad pre-testing and best TikTok ad length.
Score your ad's full attention curve in minutes. First analysis free.
Score Your AdIt falls fast with length. Short social videos under 15 seconds might see 15–30% watch to the end, with 40%+ strong; 30–60s ads often complete in the single digits. Shorter videos almost always post higher completion rates, so compare like-for-like on length and placement.
Completion rate = views that reached the end ÷ total views × 100. Platforms also report quartile metrics — 25%, 50%, 75%, 100% watched — which together form a drop-off curve showing exactly where viewers leave.
Find the second where attention falls off and fix what's there — a slow stretch, a buried payoff, a weak transition. The hook keeps people in early; pacing keeps them to the end. Predicting the attention curve before launch shows you the drop-off point without paying for the views to find it.