Effective Velocity
Also known as: EV (pitching), perceived velocity
Effective velocity is the idea that a pitch's perceived speed to a hitter depends on its location. This means inside pitches feel faster, outside and low pitches feel slower. This means not just its radar-gun reading.
A 90 mph fastball up and in gives a hitter noticeably less time to react than the same 90 mph fastball away and down. This is. This is because the inside pitch reaches the hitter's decision point sooner relative to the swing path required to get the bat there. Effective velocity theory quantifies this location-driven perception gap, often expressed as an equivalent mph adjustment. This means an inside fastball might play as several mph faster than its true velocity. At the same time, an outside changeup at the same true velocity plays even slower than the radar reading suggests.
Pitchers and pitching coaches use effective velocity thinking to sequence pitches by how they will actually be perceived rather than by raw velocity alone. Following a true fastball with a pitch located to create a large effective-velocity gap. This means even if the actual speed difference is modest. This means produces more swing-and-miss than sequencing by velocity number alone. This is why a well-located 78 mph curveball after an inside 93 mph fastball can look like a bigger velocity change to the hitter than the 15 mph gap on the gun would suggest.
Example
The pitching coordinator taught effective velocity sequencing. This means throw fastballs in on the hands, then locate the changeup down and away. As a result, the perceived speed gap is larger than the actual mph difference.
Why it matters
Understanding effective velocity helps a pitcher build sequences that maximize deception without needing more raw velocity. This means a valuable tool for pitchers whose fastball sits in an average range.
Common mistakes
- Sequencing pitches purely by true velocity gap while ignoring where each pitch is located, missing the larger perceived-speed effect location creates
- Assuming effective velocity only matters for velocity mismatches, when location alone (in vs. Away, up vs. Down) shifts perceived speed even on the same pitch type
- Overcorrecting into a mechanical sequencing formula rather than reading what the hitter is actually seeing well or missing that day
Frequently asked questions
Is effective velocity the same as a radar-gun reading?
No — the radar gun measures true velocity. Effective velocity is a theoretical adjustment describing how fast a pitch feels to the hitter based on its location, on top of its true speed.
Related terms
- Pitch VelocityPitch velocity is the speed of the ball at release, measured in miles per hour. This means the most commonly cited indicator of pitching power and arm strength.
- Pitch MixA pitcher's pitch mix is the combination and proportion of pitch types thrown. This means for example 55% fastball, 20% slider, 15% changeup, 10% curveball. This means and how that mix shifts by count and batter.
- Pitch SequencingPitch sequencing is the art of ordering pitches to exploit a hitter's tendencies and set up future offerings. This means making each pitch more effective. This is because of what came before.
- Tunnel PointThe tunnel point is the point in a pitch's flight. This means roughly where the batter must decide to swing. This means where two different pitch types are still on nearly identical trajectories before diverging.
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