Baseball Stats Glossary
Plain-English definitions of the stats and terms that actually matter for youth and travel baseball — each with the formula or rule, what a good number looks like, and how to read it in context rather than on its own. No number tells the whole story alone; the value is in the pattern across them.
Hitting
The single number that combines how often a hitter reaches base with how much power they hit for.
How often a batter reaches base per plate appearance — hits, walks, and hit-by-pitches all count.
Total bases per at-bat — weights a double, triple, and home run above a single.
The most famous hitting stat — hits divided by at-bats — and why it tells you less than it seems to.
Runs a hitter drives in — what counts as one, and why it leans on opportunity more than skill.
A coach’s stat that credits productive plate appearances, not just hits.
A catch-all offensive stat that weights each way a hitter reaches base by its real run value.
How hard the ball comes off the bat — and what counts as good by age group.
Pitching
Earned runs allowed per nine innings — the common single-number summary of run prevention.
The daily pitch limits and required rest that keep youth arms healthy, by age group.
Base runners a pitcher allows per inning — often a cleaner read than ERA in youth ball.
Strikeouts per batter faced — a rate that separates bat-missing ability from innings and opportunity.
Fielding
Terms & Rules
Three strikeouts on nine pitches in a single inning — rarer than a no-hitter.
A game-ending play: the home team scores the winning run in its final at-bat.
See every one of these on your own team
GameLense calculates these stats automatically from your GameChanger data and reads them together in one season view — so you see the full picture, not one number at a time.