A post is viral when it reaches far more people than its account normally does. Two ratios measure that.
- Views against followers. Divide the post’s views by the account’s followers. It is quick and works on any public profile, but it flatters very small accounts, where a few thousand views can look huge.
- Views against the account’s usual views. Divide the post’s views by what that account’s recent posts typically get. This is the better signal because it shows what beat the creator’s own normal, whatever their size. It takes longer because you have to look at their recent posts.
A made-up example: an account with 20,000 followers usually gets 8,000 views a post, and one Reel reaches 400,000. That Reel is 20 times its followers and 50 times its usual views, so it is worth studying. The same 400,000 views on an account with 3 million followers may be an ordinary day.
Tools use versions of these ratios. As of November 2026, Octupie defines an outlier as a post that “significantly outperforms the account’s own baseline,” and vidIQ’s Outliers looks at views, velocity and “performance vs. a channel’s usual baseline.” Our viral score weighs views against followers and audience size, and for creators you track we also measure each post against their usual views.