Skip to content
Calcapedia
Menu
Sports

Fielding Percentage Calculator

Find a fielder's or team's fielding percentage from putouts, assists and errors. See the clean chances needed to reach a target.

Level: Grades 6–7

  • 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.
  • Common Core standard 7.EE.B.4.bSolve word problems leading to inequalities of the form px + q > r or px + q < r, where p, q, and r are specific rational numbers. Graph the solution set of the inequality and interpret it in the context of the problem.
Printable worksheet

Fielding Percentage Calculator

Inputs

Enter as a decimal such as 0.980 to see how many more clean chances it would take to reach it.

Result

Fielding percentage

0.977

650 plays made in 665 chances is a .977 fielding percentage. It would take 85 more error-free chances to reach .980.

As written in stat lines
.977
Total chances
665
Errors per 100 chances
2.26
Further error-free chances to reach .980
85

See the step-by-step solution ↓

Step-by-step solution

  1. Add up total chances: every putout, assist and error is a ball the fielder could have handled

    TC=250+400+15=665

  2. Divide the plays made (putouts plus assists) by total chances to see how often the play was clean

    FPCT=250+400665=650665=0.977444

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

    0.977444 → .977

  4. Each clean chance adds one play and one chance. Find how many (x) it takes to lift the ratio to the target

    x=0.98×665−6501−0.98=85

  5. Chances come in whole numbers, so round up

    x=85

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

See how often a fielder makes the play cleanly when the ball comes their way. Fielding percentage is the oldest defensive stat in baseball and softball. It answers a simple question: when a fielder had a chance to make a play, how often did they make it cleanly? Every putout and assist is a play made, and every error is a play missed. Together they add up to the fielder's total chances.

Enter putouts, assists and errors for a player or a whole team. You get fielding percentage in the familiar three-decimal form, plus total chances and errors per 100 chances. Add a target such as .980, and the calculator also works out how many more error-free chances it would take to get there.

Where it's used

Why this math matters outside the classroom:

  • Season stat lines. A shortstop with 650 plays made in 665 chances fields 650 ÷ 665, which is .977.
  • Setting goals. That shortstop needs 85 clean chances, since (650 + 85) ÷ (665 + 85) is exactly .980.
  • Team defense. Softball coaches add all fielders' putouts, assists and errors to compare team defense across a tournament.
  • Scorekeeping practice. Youth league scorekeepers total each fielder's chances after a game to fill in the fielding columns of the scorebook.
  • Inequalities in class. Teachers turn the clean-chances question into a real inequality, (650 + x) ÷ (665 + x) ≥ 0.98, for students to solve.

Grade level and standards: Grades 6–7; Common Core State Standards for Mathematics 6.RP.A.2, 7.EE.B.4.b. © 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 putouts, assists and errors from the scorebook or a season stat line.
  2. If you like, enter a target fielding percentage as a decimal, such as 0.980.
  3. Read fielding percentage at the top, with total chances and the error rate below.
  4. If you set a target, the last result shows how many clean chances in a row would reach it.

What the inputs mean

Putouts (PO)
Given to the fielder who finishes an out. That means catching a fly ball, tagging a runner, or touching a base with the ball for a force out.
Assists (A)
Given to each fielder who throws or deflects the ball on the way to an out, such as a shortstop throwing to first.
Target fielding percentage (optional)
Must be above 0 and at most 1. A perfect 1.000 is only possible with no errors at all.

Formula and method

TC = PO + A + E
FPCT = (PO + A) ÷ (PO + A + E)
clean chances to reach t:  x ≥ (t × TC − (PO + A)) ÷ (1 − t)

PO is putouts, A is assists and E is errors. TC is total chances, and FPCT is fielding percentage. t is your target, and x is the number of extra clean chances. Fielding percentage divides the plays a fielder made by every chance they had. The same formula works for a team. Just add up all its fielders' putouts, assists and errors.

For the target, each error-free chance adds one to plays made and one to total chances. So x clean chances raise both by x. Setting the new ratio equal to the target and solving for x gives the last line. The answer is rounded up to a whole chance.

Worked example

A shortstop has 250 putouts, 400 assists and 15 errors, and wants to reach .980.

  1. Total chances: 250 + 400 + 15 = 665.
  2. Fielding percentage: (250 + 400) ÷ 665 = 650 ÷ 665 = 0.977444, written .977.
  3. Clean chances for .980: (0.98 × 665 − 650) ÷ (1 − 0.98) = 1.7 ÷ 0.02 = 85.

Result: The shortstop fields .977 over 665 chances. They need 85 more error-free chances to reach .980.

Understanding the result

Pro teams usually field around .980 to .990. Shortstops and third basemen tend to post lower numbers than first basemen, catchers and outfielders, because their chances are harder.

Compare fielders at the same position. A .970 shortstop may be a better defender than a .995 first baseman, because the two positions see very different plays.

Assumptions and limitations

  • All counts are whole numbers taken from official scoring.
  • The target calculation assumes every chance from here on is handled cleanly.
  • Fielding percentage only judges the balls a fielder reached. A slow fielder who never gets to the hard chances can still post a high number. So it doesn't measure range, the ground a fielder can cover.
  • Errors are the official scorer's judgment call. That varies from scorer to scorer and from level to level.

Frequently asked questions

What counts as a chance?

Every putout, assist and error. A ball that gets through for a hit, with no error charged, isn't a chance for anyone.

What is a good fielding percentage?

It depends on the position. In pro play, around .980 is normal for a team. Infielders on the left side often sit near .970, and first basemen often reach .990 or higher.

Can fielding percentage be 1.000?

Yes, if a fielder has no errors at all. Once an error is charged, more clean chances bring the number closer to 1, but never back to it.

Does a team use the same formula?

Yes. Add up every fielder's putouts, assists and errors, and use the same ratio on the totals.

Sources

How this calculator is checked

Method: MLB glossary definition: putouts plus assists divided by total chances (putouts, assists and errors). Target chances solved algebraically from the same ratio. The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.

Embed this calculator

Put this Fielding Percentage Calculator on your own website or blog for free. Paste this code where you want it to appear: