Pitching metrics

SIERA calculator

Drop in a pitcher's plate-appearance and batted-ball counts. The readout updates as you type.
PA plate appearances
SO strikeouts
BB walks
GB ground balls
FB fly balls
PU pop-ups
Enter a PA value greater than zero.
SIERA
—.——
Fill in all six values to see the result.
K%—
BB%—
Net BIP—
SIERA = 6.145 − 16.986(SO/PA) + 11.434(BB/PA) − 1.858(netGB/PA) + 7.653(SO/PA)² ± 6.664(netGB/PA)² + 10.130(SO/PA)(netGB/PA) − 5.195(BB/PA)(netGB/PA), where netGB = GB − FB − PU. The ± term takes a minus sign when netGB is zero or positive (groundball-neutral or -heavy) and a plus sign when netGB is negative (flyball-heavy).