WHIP in Baseball: Formula, Examples and How to Read a Pitcher’s Stat

WHIP in baseball stands for “walks plus hits per inning pitched.” It measures how often a pitcher allows a batter to reach base by hit or walk. Lower WHIP usually means fewer of those baserunners per inning. A 1.00 WHIP means an average of one walk or hit per inning, not a guarantee that exactly one runner reached in each inning.

MLB’s official statistics glossary defines the metric as total walks plus hits divided by innings pitched. Its wording and exclusions were checked October 11, 2026.

How to calculate WHIP

The formula is WHIP = (walks allowed + hits allowed) ÷ innings pitched. Use the pitcher’s pitching line rather than the team’s offensive totals. A hitter drawing a walk increases the pitcher’s WHIP numerator by one; a clean single does the same.

These three rows are arithmetic examples, not actual player season statistics. For Pitcher B, the numerator is 210; divide by 175 innings to get 1.20. If two pitchers work a very different number of innings, WHIP normalizes hits and walks to a one-inning rate.

Why baseball innings notation can trick calculators

In a baseball line, 12.1 IP means 12 innings and one out, not twelve and one-tenth innings. Similarly, 12.2 means 12 innings and two outs. In a mathematical WHIP formula, 12.1 IP is 12 + 1/3 innings (about 12.333), and 12.2 is 12 + 2/3 (about 12.667).

Example: a pitcher permits 10 hits and 3 walks in 12.1 baseball innings. The correct formula uses 13 ÷ (12 + 1/3) = approximately 1.054. Incorrectly dividing 13 by decimal 12.1 would give a different, invalid result. Convert completed outs to thirds before calculating.

What counts toward WHIP and what does not?

This is a limitation, not an oversight. WHIP is specifically a hits-and-walks rate; it does not describe all possible ways to reach base or the damage caused by those runners. A home run and a single each count as one hit in the numerator even though their run-scoring impact can differ dramatically.

What is a good WHIP in MLB?

Lower generally indicates better baserunner prevention, but there is no single official grade that turns a WHIP into “good” in every era and role. A 1.00 season is very stingy; 1.20 means a bit more than one hit or walk per inning. Evaluate a pitcher’s season, innings sample, league environment and role instead of treating one rounded number as a complete scouting report.

Relievers often have smaller innings totals, making their WHIP more volatile after one rough outing. Defensive quality can also affect hits allowed. A walk-heavy pitcher and a hit-heavy pitcher may have the same WHIP but require different tactical responses.

WHIP vs. ERA: what is the difference?

WHIP measures walks and hits allowed per inning; ERA estimates earned runs allowed per nine innings. A pitcher can allow several hits and strand the runners, giving a relatively high WHIP but low ERA. Another pitcher might allow few runners but surrender damaging extra-base hits at an inopportune moment. Neither stat alone tells the whole story.

To compare formulas, read AVARIXO’s guide to earned run average (ERA). Our infield fly rule explainer covers another common baseball statistical and officiating question.

Where is WHIP useful?

WHIP appears in pitching splits, broadcasts, scorecards and fantasy-baseball formats. It is useful for quickly screening how frequently a pitcher puts the ball in play for a hit or gives up free passes. Before comparing two pitchers, check whether you’re looking at full-season WHIP, career WHIP, home/away splits or only a few recent appearances.

WHIP frequently asked questions

Does a hit batter raise WHIP?

No. MLB excludes batters reaching via hit-by-pitch from the standard WHIP calculation, even though they become baserunners.

Is WHIP a percentage?

No. It is a rate of counted hits and walks per inning pitched, so values such as 1.05 or 1.40 are not percentages.

Can WHIP be below 1.00?

Yes. That means the pitcher allowed fewer than one hit plus walk per inning on average during the period measured.

Do intentional walks count?

Yes. They are counted among bases on balls allowed, so they increase the walks in the WHIP numerator.

Official source and image credit

• MLB Glossary — Walks and Hits per Inning Pitched, checked October 11, 2026.
• Featured baseball pitcher photo by Drovetochicago, Wikimedia Commons, CC BY-SA 4.0; no manual changes.