Reading Your Pitching Data: Trackman and Rapsodo Numbers Explained

Pitch-tracking reports can look like a spreadsheet with no instructions. A handful of numbers do most of the work.

Velocity

How fast the ball is moving out of the hand. Look at your average, not your best pitch, and watch how well it holds through an outing.

Spin rate

How many times per minute the ball is spinning. More spin gives a pitch more potential movement. On its own, it tells you little. Two fastballs with the same spin rate can move very differently.

Spin direction and spin efficiency

Spin direction is the tilt of the ball's axis, often shown as a clock face. Spin efficiency is how much of the spin produces movement. A four-seam fastball with high efficiency carries. A slider usually has lower efficiency by design.

Induced vertical break and horizontal break

These describe how much the ball moves compared with a pitch with no spin. Induced vertical break, or IVB, is the carry on a fastball: a higher number means it drops less than a hitter expects. Horizontal break is the side-to-side run or cut.

For most pitchers these two numbers are the most useful on the report. They describe the shape of each pitch.

Release height and extension

Release height is how far off the ground the ball leaves your hand. Extension is how far in front of the rubber you release it. More extension gives the hitter less time. Release height combines with movement to set your vertical approach angle.

How to use the numbers

• Compare pitches to each other. A changeup needs to differ from the fastball in speed and movement. If the two look alike on the report, hitters see them the same way.
• Know your fastball type. A high-carry fastball plays up in the zone. A fastball with run and sink plays down. Throwing it where it does not fit wastes it.
• Track changes over time. One session is a snapshot. Trends across months show whether training is working.
• Do not chase one number. Spin rate with poor efficiency, or velocity with no command, does not get outs.

Where it fits in training

Data tells you what the ball did. Video shows why. Strength and mobility decide what your body is able to change. We use all three together, and the report matters most when it changes what you do in the next bullpen.

You do not need to own the equipment. Many facilities rent time on these units, and a session every month or two is enough to track progress.