BB%
Walk rate — share of plate appearances that end in a walk.
What BB% means
Plate-appearance-rate version of walks; more stable across volume than raw BB totals. League average ~8%.
How BB% is calculated
BB% = BB / PA
What counts as a good BB%
Higher is better — roughly .060 is poor, .080 average, .100 good, and .130 or better elite.
Also written
walk_pct · bb_rate · walk_rate