What is WHIP in baseball?

WHIP stands for Walks plus Hits per Inning Pitched. It measures how many base runners a pitcher allows per inning via walks and hits, making it a direct gauge of how often a pitcher lets runners on base. A lower WHIP is better.

What is the WHIP formula?

WHIP = (walks + hits) / innings pitched. Innings must first be converted from baseball thirds notation, where .1 means one-third of an inning and .2 means two-thirds, into true decimal innings before dividing.

A WHIP below 1.00 is elite and rare over a full season, around 1.10 to 1.30 is solid to average, and above 1.50 is poor. Top closers and aces often post sub-1.00 WHIPs in strong years.

Does WHIP include hit batters or errors?

No. WHIP counts only walks and hits, not hit-by-pitches, and never counts runners who reach on errors. This keeps it focused on the base runners the pitcher most directly allows.

How does WHIP differ from ERA?

ERA measures runs allowed per nine innings, an outcome that depends partly on defence and sequencing. WHIP measures base runners allowed regardless of whether they score, so it isolates a pitcher's command and contact prevention more directly.

Baseball WHIP Calculator

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WHIP answers a simple question ERA cannot: how often does this pitcher let runners reach base? Because it ignores whether those runners score, WHIP is a cleaner read on command and contact prevention. This calculator computes it with correct innings-in-thirds handling and rates the result against MLB benchmarks.

How it works

WHIP divides the base runners a pitcher allows by the innings they pitched, after converting innings notation:

real IP = whole innings + (thirds digit / 3)   // .1 -> .333, .2 -> .667
WHIP    = (BB + H) / real IP

Only walks and hits count — hit batters and reached-on-error runners are excluded by definition. The lower the figure, the fewer runners the pitcher puts on per inning.

Example and tips

A pitcher allowing 45 walks and 150 hits over 180.2 innings has a real IP of 180.667, so WHIP = (45 + 150) / 180.667 = 195 / 180.667 ≈ 1.08 — a strong, above-average mark. Always enter innings in thirds notation; typing 180.7 as a plain decimal would understate the workload and inflate WHIP.