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BABIP Calculator

Find how often a hitter's balls in play fall for hits (BABIP), for a hitter or a pitcher, and compare it with a reference figure.

Level: Grade 6

  • Common Core standard 6.EE.A.2.cEvaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations).
  • Common Core standard 6.RP.A.2Understand the concept of a unit rate a/b associated with a ratio a:b with b ≠ 0, and use rate language in the context of a ratio relationship.
Printable worksheet

BABIP Calculator

Inputs

Around .300 is a typical league-wide figure. Use a player's career BABIP to see whether this stretch is unusual for them.

Result

BABIP

0.365

135 hits on 370 balls in play is a .365 BABIP. That is .065 above .300.

As written in stat lines
.365
Balls in play
370
Hits on balls in play
135
Batting average (H ÷ AB)
0.32
Difference from .300
0.065Higher than the figure you chose.

See the step-by-step solution ↓

Step-by-step solution

  1. Hits on balls in play: take home runs out of the hits, since no fielder could play them

    160−25=135

  2. Balls in play: at-bats minus strikeouts and home runs, plus sacrifice flies

    500−110−25+5=370

  3. Divide hits on balls in play by balls in play. That share is BABIP

    BABIP=135370=0.364865

  4. Round to three decimals, the way box scores show it

    0.364865 → .365

  5. Subtract the reference BABIP to see how far above or below it this stretch is

    0.364865−0.3=0.064865

Test yourself

20 quick questions built from this calculator's formula: work out results, predict what happens when an input changes, and work backward from an answer. Every answer comes with the working.

What this calculator does

Find out how often a hitter's balls in play drop for hits. That number is called BABIP, short for batting average on balls in play. It asks a narrower question than batting average. Of the balls a hitter put into the field, how many fell for hits? Home runs and strikeouts are left out, because no fielder can do anything about either. Sacrifice flies are added back in. They were balls in play, even though they don't count as official at-bats.

Fans and analysts use BABIP to tell skill from luck. Over a few weeks it swings a lot. Then it tends to drift back toward a player's usual level. So a hitter or pitcher with an extreme BABIP is often due for a change. The calculator gives you BABIP and the number of balls in play. It also shows batting average for comparison, and the gap from any reference figure you choose.

Where it's used

Why this math matters outside the classroom:

  • Spotting hot streaks. A hitter with 135 hits on 370 balls in play has a BABIP of .365, well above a typical .300.
  • Evaluating pitchers. A pitcher allowing 60 hits on 240 balls in play has a .250 BABIP, a sign that some good fortune may fade.
  • Fantasy baseball trades. Fantasy managers check BABIP before trading for a hitter whose average jumped after a lucky few weeks.
  • Coaching hitters. High school coaches compare BABIP with strikeout counts to see whether a slump comes from contact or from swinging and missing.
  • Statistics lessons. Teachers use BABIP to show how removing outcomes from both parts of a ratio changes what the rate measures.

Grade level and standards: Grade 6; Common Core State Standards for Mathematics 6.EE.A.2.c, 6.RP.A.2. © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

How to use it

  1. Enter hits, home runs, at-bats, strikeouts and sacrifice flies. For a pitcher, use the hits, home runs, at-bats and strikeouts the pitcher allowed.
  2. If you like, set a reference BABIP. Try .300 for a typical league figure, or the player's own career rate.
  3. Read BABIP at the top. It's written to three decimals, the way it appears in a stat line.
  4. Check the difference row to see how far above or below the reference this stretch sits.

What the inputs mean

Strikeouts (K)
All strikeouts, swinging or looking. A strikeout is never a ball in play, so it comes out of the bottom of the fraction.
Sacrifice flies (SF)
Fly-ball outs that let a runner score. They aren't at-bats, but the ball was put in play and caught. So they're added to the bottom of the fraction. Sacrifice bunts aren't included.
Compare with a BABIP of (optional)
Leave this blank to skip the comparison. It doesn't change BABIP itself.

Formula and method

hits in play = H − HR
balls in play = AB − K − HR + SF
BABIP = (H − HR) ÷ (AB − K − HR + SF)

In the formulas, H is hits, HR is home runs, AB is at-bats, K is strikeouts and SF is sacrifice flies. The top of the fraction keeps only hits a fielder had a chance to stop. The bottom keeps only trips to the plate that ended with the ball in the field. That means at-bats without strikeouts or home runs, plus sacrifice flies.

Walks and hit-by-pitches never appear, because the ball wasn't put in play. Reaching base on an error counts as an at-bat that isn't a hit. So it lowers BABIP like any other out.

Worked example

A hitter has 160 hits, including 25 home runs, in 500 at-bats, with 110 strikeouts and 5 sacrifice flies.

  1. Hits on balls in play: 160 − 25 = 135.
  2. Balls in play: 500 − 110 − 25 + 5 = 370.
  3. BABIP: 135 ÷ 370 = 0.364865, written .365.
  4. Against a .300 reference: 0.364865 − 0.3 = 0.064865.

Result: The hitter's BABIP is .365, about .065 above a .300 reference, while the batting average is .320.

Understanding the result

Across a whole league, BABIP usually sits close to .300. Single hitters differ. Fast runners and players who hit the ball hard can keep a higher figure. So compare with a player's own history as well as the league.

For pitchers, a BABIP far from about .300 over part of a season often reflects defense and luck more than pitching skill. It tends to move back toward normal over time.

Assumptions and limitations

  • All counts are whole numbers. Home runs aren't more than hits, and hits plus strikeouts aren't more than at-bats.
  • Inside-the-park home runs count as home runs, just as the official formula treats them.
  • BABIP needs many balls in play to settle down. Over a few hundred, chance alone can move it by several dozen points.
  • It doesn't say why balls fell for hits. How hard the ball was hit, the runner's speed and the defense behind a pitcher all play a part.

Frequently asked questions

What is a normal BABIP?

Around .300 is typical for a whole league. A single season above about .350 or below about .250 is unusual. It often moves back toward the player's norm, though not always.

Why are home runs left out?

A home run leaves the field of play, so no fielder can turn it into an out. Taking out home runs and strikeouts leaves only the results the defense could affect.

Can I use BABIP for a pitcher?

Yes. Enter the hits, home runs, at-bats and strikeouts the pitcher allowed. A pitcher's BABIP helps show whether a high or low hit rate is likely to last.

Is a high BABIP always luck?

No. Some hitters run well or hit the ball hard enough to post a high BABIP year after year. It's the gap from a player's own normal level that hints at luck.

Sources

How this calculator is checked

Method: MLB glossary formula BABIP = (H − HR) ÷ (AB − K − HR + SF); checked against its 2-for-5 worked example (.333). The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.

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