What this calculator does
Fielding percentage is successful plays divided by total chances: putouts plus assists, over putouts plus assists plus errors. A fielder with 220 putouts, 310 assists and 12 errors is at .978.
The figure is very high for everyone, which is its main weakness. The range between a good fielder and a poor one is a few thousandths, and more importantly it only counts balls the fielder actually reached. A fielder with limited range makes fewer errors precisely because fewer balls get near them, and fielding percentage rewards that.
The formula
Total chances are putouts plus assists plus errors. Fielding percentage is putouts plus assists divided by that total, expressed to three decimal places. Balls not reached are not chances, so they never enter the calculation, which is the statistic central limitation.
| Term | Meaning |
|---|---|
| Putout | Recording an out directly, such as catching a fly ball or tagging a runner. |
| Assist | Contributing to an out made by another fielder, typically by throwing. |
| Error | A misplay the scorer judges should have resulted in an out. |
| Range factor | Plays made per game, an alternative that rewards reaching more balls rather than only handling them cleanly. |
The inputs explained
| Field | What to enter |
|---|---|
| Putouts | Putouts. |
| Assists | Assists. |
| Errors | Errors charged. |
When to use it
Reading a season fielding line
Fielding percentage is the traditional headline defensive number and appears in every standard statistics line.
Comparing fielders at the same position
Comparison only works within a position, since a first baseman and a shortstop face completely different chance profiles.
Understanding why it is limited
Seeing how little the figure moves between good and poor fielders is the clearest argument for the range-based measures that replaced it.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How much do errors move fielding percentage?
A fixed number of successful plays against a range of errors.
Questions
What is a good fielding percentage?
It depends heavily on position. First basemen routinely exceed .990 while shortstops and third basemen sit closer to .960 to .975, because the plays are harder and the throws longer. Comparing across positions is meaningless.
Why is fielding percentage criticised?
Because it only counts balls the fielder reached. A fielder with poor range never gets close enough to misplay a ball, so they are not charged an error, while a fielder with great range attempts harder plays and is charged when one fails. It can reward immobility.
What measures range instead?
Range factor, which is plays made per game or per nine innings, was the first attempt. Modern defensive metrics such as defensive runs saved and outs above average use tracking data to estimate how many plays an average fielder would have made on the same batted balls.
Who decides what counts as an error?
The official scorer, as a judgement call. This introduces real inconsistency: the same play can be scored differently by different scorers and in different ballparks. It is another reason the statistic is treated with caution.
For goaltending, see the save percentage calculator. For batting, see the batting average calculator.