CSW%
Called strikes plus whiffs as a share of all pitches thrown.
What CSW% means
A single number for "how often did this pitch beat the hitter, either way?" — it counts the strikes he took and the ones he missed. Less noisy than whiff% because it uses every pitch as the denominator rather than only swings, which makes it stabilise fast enough to read start to start. Pitcher league median ~27%; 30%+ is front-line.
How CSW% is calculated
(called strikes + whiffs) / pitches
What counts as a good CSW%
Higher is better — roughly .242 is poor, .269 average, .288 good, and .305 or better elite.
Also written
csw · called_strikes_plus_whiffs · csw_rate
Source
Statcast