ERA, WHIP & FIP Calculator
Earned run average, WHIP, FIP and the per-nine rates from a pitching line, with innings entered the box-score way (6.2 = 6⅔).
ERA over nine innings (or the seven of softball), WHIP, strikeout-to-walk ratio, K/9, BB/9, H/9 and HR/9, and FIP once you add the season constant — with the innings converted from box-score notation.
Example: 180.1 innings, 60 earned runs, 150 hits, 50 walks, 190 strikeouts, 18 homers, 6 HBP: ERA 2.99, WHIP 1.11, FIP 3.22 with a 3.10 constant.
Outs,
not decimals.
How box-score innings become thirds, what ERA and WHIP divide, where FIP’s weights and constant come from, and what none of them see.
Innings are thirds
A box score writes innings as whole innings and outs: 6.1 is six innings and one out, 6.2 six and two — 6⅓ and 6⅔ innings, not 6.1 and 6.2. The page converts to outs ÷ 3 before any rate; a digit of 3 or more after the point is rejected.
ERA and WHIP
ERA is earned runs per nine innings: ER × 9 ÷ IP. Softball and many high-school leagues play seven innings, so the innings per game is an input. WHIP is walks plus hits per inning, with no scaling. The per-nine rates always use nine.
FIP
Fielding independent pitching keeps only what the pitcher controls without fielders: (13 × HR + 3 × (BB + HBP) − 2 × K) ÷ IP, plus a constant that puts it on the ERA scale. The constant changes every season and league, so it is an input — FanGraphs publishes it.
What the numbers do not settle
Unearned runs are not in ERA by definition, and no rate here adjusts for park or opponents. Inputs stay in your browser; the same anonymous usage counts as the rest of the site apply.
SOURCES
- MLB.com Glossary — standard and advanced batting and pitching statistics
- FanGraphs Library — FIP and the season FIP constant (Guts! page)
Last reviewed 24 September 2026. How results are checked: How we verify.