Baseball & softball stat calculator

Type in the raw numbers from your scorebook and get the rates back. Nothing is sent anywhere — the whole thing runs in your browser.

Batting

At-bats (AB) Hits (H) Doubles (2B) Triples (3B) Home runs (HR) Walks (BB) Hit by pitch (HBP) Sacrifice flies (SF)

AVG batting average: .---

OBP on-base percentage: .---

SLG slugging: .---

OPS on-base plus slugging: .---

TB total bases: 0

Pitching

Innings pitched (IP) Earned runs (ER) Hits allowed (H) Walks allowed (BB) Strikeouts (SO)

Innings are written the way a scorebook writes them: 6.1 means six and one third — six innings plus one out — and 6.2 means six and two thirds. Decimals like 6.33 are not how baseball counts.

Game length Nine innings — standard baseball Seven innings — most softball, many youth leagues

ERA per 9 innings: -.--

WHIP walks + hits per inning: -.--

K/9 strikeout rate: -.--

Outs recorded: 0

Why the game-length switch matters

ERA means earned runs per game, and "a game" has been nine innings for as long as the statistic has existed. Most slow-pitch and fast-pitch softball, and a great many youth leagues, play seven. If you work out a softball pitcher's ERA with the nine-inning formula you inflate it by about 29% against the league she actually pitches in.

Neither number is wrong — they answer different questions — but a league's own leaderboard should use the league's own game length, and both should say which they used. That is what the switch above does.

What each one means

AVG: Hits divided by at-bats. Walks are not at-bats, so a walk neither helps nor hurts it.
OBP: How often a batter reaches base: hits, walks and hit-by-pitches over at-bats, walks, hit-by-pitches and sacrifice flies. Sacrifice bunts are left out; sacrifice flies are not.
SLG: Total bases per at-bat — a double counts twice, a home run four times. It measures power, not getting on base.
OPS: OBP plus SLG. Crude — it adds two numbers with different denominators — but it sorts hitters surprisingly well.
ERA: Earned runs per game's worth of innings. Earned excludes runs that scored because of errors.
WHIP: Walks plus hits per inning pitched: how many runners a pitcher lets on, ignoring how they got on.

Keeping score by hand? How to keep a scorebook → · Printable scoresheet →

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