SwStr% is the hitter’s rate of swinging strikes per total pitches seen. It’s the mirror of Whiff% — same swings, same misses, but viewed from the batter’s side and using all pitches as the denominator instead of just swings.

Low-SwStr% hitters are the contact specialists — Luis Arraez, Steven Kwan types — who almost never miss when they swing. A hitter sitting under 7% is exceptional. A hitter over 15% is a strikeout candidate.

SwStr% is one of the most stable hitting metrics, which makes it predictive. Hitters who flash a low SwStr% in their first 100 PA tend to keep flashing it. It’s a useful input for projecting K rate going forward, and a key plate-skill signal alongside Contact% on the Discipline percentile section.

What is a good SwStr%?

SwStr% is an underlying driver of K%. Hitters with low SwStr% strike out less often, walk more (because they don’t swing through pitches in two-strike counts), and produce higher wOBA — which is the input to NUT for hitters.

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