STRA/IN
Stress to Rest Arm per Inning

Pitch counts tell you how much a pitcher threw. They don't tell you what it cost. STRA/IN scores every inning on the situation inside it — two-strike counts, traffic on the bases, extended at-bats — so two 85-pitch outings stop looking identical.

The Scale

league mean anchors to 50
Efficient
≤ 45
Cheap outs. Quick counts, empty bases.
Normal
46 – 52
A routine inning at league cost.
Friction
53 – 64
Work to get out of. Counts running deep.
Heavy
65 – 74
An expensive inning. Traffic and two-strike volume.
Danger
75 +
The top 1% of innings by situational cost.
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