What is Form rounds?
How many measured rounds the player's Form score is built from. More rounds = a more trustworthy form estimate; a handful of rounds is flagged as thin.
The form layer shrinks thin-sample players toward the field average, so a low count already pulls the score toward neutral rather than swinging on noise.
How it's calculated
This is a count of the evidence behind another number, published so that the other number can be judged rather than taken on trust. It is derived by counting the rounds or events that actually fed the figure it accompanies — not estimated, and not smoothed. It is not a performance measure, it does not enter any ranking on this site, and a player is never advantaged or penalised for it. It exists purely so a reader can tell a well-supported number from a thinly supported one.
How to read it
More rounds mean the form component rests on more evidence. Few rounds means it should be discounted accordingly.
What it doesn't say
This is a reliability indicator, not an achievement. A large count does not make the underlying number good, only better supported; a small one does not make it wrong, only uncertain. Its purpose is to stop a striking figure built on a handful of rounds being read with the same confidence as one built on a full season. The most common mistake is to ignore it entirely and treat every number on a page as equally solid — which is exactly how an outlier from four measured rounds ends up quoted as though it described a player's true standard.
OTIS tracks this stat across 15 PGA Tour seasons — see it for every player, or read how the numbers are sourced in the methodology.