How to use this tool
Replace the example values with your own inputs. Results update as you type. Keep your measurement period and definitions consistent, then use the result to inform the next question in your advertising review.
The formula
Hook rate = 3-second views ÷ impressions × 100. Hold rate = 15-second views ÷ 3-second views × 100.
Worked example
30,000 three-second views from 100,000 impressions gives a 30% hook rate. 9,000 fifteen-second views gives a 30% hold rate.
What the result can tell you
These are explicit working definitions, not universal platform metrics. Compare videos long enough for both milestones and use the same view-counting method.
Is it free, and where do my inputs go?
The tool runs in your browser without an account or an ad-platform connection. Calculation inputs are not sent to WhatWins. If you save a scenario, it stays in this browser on this device.