ERA, WHIP and OPS calculators
Built for youth baseball, where a regulation game is six or seven innings — not nine. Nothing to sign up for, and nothing is sent anywhere: the maths runs in your browser.
ERA calculator
Both numbers come from the same outing. That gap is the whole reason this calculator asks for game length — a generic ERA calculator assumes nine innings, and on a six-inning Little League game that inflates every pitcher on your staff by half.
WHIP calculator
WHIP is already “per inning”, so game length cannot distort it. That makes it the fairer number when you are comparing a pitcher from a six-inning league against one from a seven-inning league.
OPS calculator (OBP + SLG)
Two details most calculators skip, and both matter more in youth ball than anywhere else. Reaching on an error is an at-bat — it belongs in the denominator but not the numerator, and leaving it out inflates AVG and OBP together. And a sacrifice fly counts against on-base percentage while a sacrifice bunt does not: the rule refuses to charge a batter for giving themselves up on a bunt.
The formulas
(Earned Runs ÷ Innings Pitched) × innings in a game(Walks + Hits Allowed) ÷ Innings Pitched(H + BB + HBP) ÷ (AB + BB + HBP + SF)Total Bases ÷ AB TB = 1B + 2×2B + 3×3B + 4×HROBP + SLGInnings pitched come from outs, not from a decimal: “2.1 innings” means seven outs. The calculators above take outs for exactly that reason.
Why most ERA calculators get youth baseball wrong
ERA means earned runs per game. The number you multiply by is however many innings a game is, and every general-purpose calculator uses nine because that is what a major league game is.
A Little League game is six innings. Most travel ball and high school is seven. Run a six-inning league’s numbers through a nine-inning formula and every ERA on your staff comes out 50% too high — a 3.00 pitcher reads as 4.50.
It matters beyond arithmetic. Coaches use ERA to decide who starts an elimination game, and parents read it as a verdict on their kid. A number that is wrong by half is worse than no number.
DugoutOps computes it against the game length your league actually plays, which is why the calculator above asks.
Stop doing this by hand
DugoutOps computes all of this as you score the game — per player, per season and across a career — with the game length and sanctioning rules your league uses. Scoring is free on every plan.
See what it costs · Little League pitch counts · USSSA innings limits