Extension

How far in front of the rubber he releases his four-seam fastballs and sinkers, on average, in feet.

Agreement with Savant

Checked weekly, for completed seasons only. Agreement tolerance: ±0.005.

Shown for: pitcher.

Formula

sum(ext_sum) / NULLIF(sum(ext_n), 0)

Over the same fastballs as FB Velo, matching Savant’s percentile extension.

Inputs

pitches.release_extension
pitches.pitch_type
pitches.pfx_x
pitches.pfx_z
plate_appearances.ext_sum
plate_appearances.ext_n

Era caveats

Three tracking systems across the seasons shown

Statcast used TrackMan through 2019, Hawk-Eye for 2020–2022, and Hawk-Eye with bat tracking from 2023. The systems differ in what they measure and how precisely, so long spans cross a measurement boundary as well as a rule one.

Version history

2026-09-27: Added to the Explorer. Within Savant’s ±0.01 ft band for all 804 pitchers in 2025 and all 725 in 2016, against the same Statcast Search figures.