The slash line every hitter lives by — batting average, on-base and slugging, plus OPS — and the pitching numbers (ERA and WHIP). Enter a box score and get the exact formulas and a read on what they mean.
BA = H ÷ AB. OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF). SLG = total bases ÷ AB, where total bases counts singles 1, doubles 2, triples 3, homers 4. OPS = OBP + SLG. ERA = earned runs × 9 ÷ innings pitched. WHIP = (walks + hits) ÷ innings pitched.