What view-through rate measures
View-through rate (VTR) is the percentage of video ad impressions that end in a completed view, or a view past a defined threshold. If 20,000 impressions produce 1,400 completed views, VTR is 7%. Platforms set the threshold differently, so a YouTube view, a Meta ThruPlay and a programmatic completion are not identical counts, even when every report calls the result VTR.
Two neighbours get mixed up with it. Hook rate looks only at the opening seconds, and watch time totals or averages the seconds people spent. VTR asks a narrower question: of everyone served the ad, how many reached the end. Keep it apart from view-through conversions too, which credit a sale to an ad someone saw without clicking.
Reading VTR on creator ads
VTR is most useful when comparing cuts of the same creator footage. Length dominates the number: a 12-second edit almost always finishes more often than a 45-second testimonial, so compare videos of similar duration or read VTR beside the length column. On short placements a high VTR suggests the middle and ending are holding attention, not just the open.
Use it to decide edits rather than budgets. A video with a strong opening and weak VTR usually has a slow middle, a late product reveal or a soft ending, and a tighter recut from the raw footage often fixes it. Purchases still decide which ad gets scaled.
Worked example
A pet brand runs two edits of one creator's video. Edit A runs 30 seconds and gets 50,000 impressions with 2,500 completions, a VTR of 5%. Edit B, cut to 15 seconds from the same footage, gets 48,000 impressions with 6,240 completions, or 13%.
The shorter cut carries people to the call to action more than twice as often, and in this example its cost per purchase is lower too. The team briefs the next creator for a 15-second core edit with a longer version as an optional extra, rather than the other way round.
Common mistakes
Treating VTR as a quality score across lengths and platforms is the main error. Thresholds differ, autoplay inflates starts, and a six-second bumper will beat a minute-long demo every time. Figures copied from another account or channel mean little; use your own account median for each length band.
The other mistake is optimising for completion at the expense of selling. A video can be watched to the end because it entertains and still fail to move product. Keep VTR in the diagnostic column next to CTR and cost per result, and see the TikTok UGC ads guide for pacing patterns.
How it's used
"VTR on the 15-second cut is more than double the 30, so ask the creator for shorter core edits next round."
"Don't compare that VTR to the YouTube campaign; Meta ThruPlays use a different threshold."