"KAST in CS2, defined"

KAST is the percentage of rounds in which a player recorded a Kill, an Assist, Survived, or was Traded.

It answers one narrow question well: in what share of rounds did this player do something useful? A support player who survives to save a rifle, or who dies but is immediately traded, is contributing — and KAST is the common stat that says so.

Typical professional KAST runs around 70%. Below 65% suggests a player is dying first and uncontested. Above 75% is excellent consistency.

The trade-off is that KAST is blind to magnitude: a 1-damage assist and a clutch four-kill each count once. That is deliberate — it measures consistency, which is exactly why it pairs with ADR, the output stat, inside a composite rating.

See KAST in CS2 explained for how each of the four components is counted.