Every baseball tool,
in one dugout.
Stat calculators, bat and glove sizing, field dimensions, pitch counts and lineups — fast, accurate and built for coaches, players and parents at the field.
18
42.1
(18 × 9) ÷ 42.33 = 3.83
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Seven categories, one place. Everything a ball family needs.
Baseball Stat Calculators
Free calculators for every common baseball stat — batting average, OBP, slugging, OPS, ERA, WHIP and more. Type your numbers and the result updates instantly, with the formula and a worked example on every page.
OpenBat, Glove & Gear Sizing
Size a bat, glove or helmet in seconds using age, height and league. Charts are guidelines drawn from manufacturer sizing — always try gear before you buy.
OpenField Dimensions & Rules
Base paths, mound distances, field dimensions, positions and league rules like Pitch Smart — the reference every coach and parent needs at the field.
OpenCoaching Tools
Build a lineup, track pitch counts, print a scorecard and run a tryout — practical tools designed to work one-handed on a phone at the field.
OpenPlayer Development & Benchmarks
See how exit velocity, pitching velocity and 60-yard-dash times stack up by age so you can set realistic goals and track progress.
OpenFun & Extras
Walk-up song ideas, team name generators and card makers — the lighter side of the ballpark.
OpenLearn Baseball
Plain-English explainers on stats, rules and terminology — understand what the numbers mean and how the game works.
OpenMost-used tools
The ones coaches and parents reach for first.
ERA Calculator
Calculate earned run average from earned runs and innings pitched.
Batting Average Calculator
Find a batting average from hits and at-bats.
OPS Calculator
Add on-base and slugging to get OPS, the all-in-one hitting number.
Bat Size Calculator
Get a recommended bat length, drop weight and certification by age and height.
Baseball Glove Size Chart
Find the right glove size by age and position.
Baseball Positions & Numbers
The nine positions, their scorebook numbers and what each one does.
Learn the game
Plain-English explainers on stats and rules.
What Is OPS in Baseball?
OPS combines on-base and slugging into one number. Here is what it measures and what counts as good.
What Does ERA Mean in Baseball?
Earned run average is the classic pitching stat. Learn how it is calculated and what separates a good ERA from a bad one.
What Is WHIP in Baseball?
WHIP measures how many baserunners a pitcher allows per inning. Here is how to read it.
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