Arc Height Regulation
Also known as: arc window, pitch arc height
Arc height regulation defines the required minimum and maximum height a slow-pitch delivery must reach — typically 6 to 12 feet — to be called a legal pitch.
The arc window exists to make the pitch predictable and hittable: too flat and it plays like fast-pitch; too high and it falls almost straight down, giving batters no horizontal timing reference. Pitchers aim for the middle of the window (8–10 feet) because it is forgiving, repeatable, and keeps batters guessing about the descent angle. Arc measurement is a judgment call by the umpire, so consistency beats extreme heights.
Example — During pre-game warm-ups
A pitcher consistently places the ball at 9 feet of arc, the sweet spot of the 6-to-12-foot legal window, keeping the umpire happy and batters uncomfortable.
Why it matters
Pitchers who master the arc window put pressure on hitters rather than gifting free bases. SwingVantage helps teams track arc tendencies for both their pitcher and opponents.
Related terms
- ArcThe arc is the high, looping flight path a legal slow-pitch delivery must follow — typically a minimum of 6 feet and a maximum of 12 feet. Hitters time their swing to the ball’s descent.
- Legal DeliveryA legal delivery in slow-pitch softball is a pitch that is released underhand with a smooth, continuous motion and arrives within the required arc height — typically between 6 and 12 feet — over the plate.
- Pitch TrackingPitch tracking is following the high-arcing slow-pitch ball all the way from its peak down to the contact point. Because the ball descends steeply, the eyes lead the swing.
Related guides & benchmarks
Put this into your swing
SwingVantage can spot this in your own swing — free to start.