About the Fielding Percentage Calculator
This fielding percentage calculator works out how often a baseball or softball fielder handles a chance cleanly. Enter putouts, assists and errors and it returns fielding percentage in the familiar three-decimal form (such as .978), along with total chances and the number of errors per 100 chances.
Add games played or defensive innings to get range factor — successful plays per game or per nine innings — which shows how much ground a fielder covers. Fielding percentage rewards sure hands, but a fielder who reaches fewer balls makes fewer errors, so the two numbers together give a fairer picture.
It is useful for coaches filling in season stats, players tracking their defense, and fans comparing shortstops or outfielders. The formula matches the official scoring rules used by MLB and amateur leagues.
With the default inputs, the fielding percentage is 0.977. Change any value above to recalculate instantly.
How to use the fielding percentage calculator
- 1Enter the fielder’s putouts.
- 2Enter assists.
- 3Enter errors charged.
- 4Optionally add games or defensive innings for range factor.
- 5Read the fielding percentage and compare it with typical values for the position.
Formula and method
Fielding percentage divides the plays a fielder made successfully — putouts plus assists — by total chances, which also include errors. It is written to three decimals without the leading zero. A fielder with no chances has no defined fielding percentage, shown here as a dash.
Range factor, popularised by Bill James, measures volume rather than reliability: putouts plus assists per nine defensive innings (RF/9) or per game played (RF/G). A shortstop with a high range factor reaches more balls, while fielding percentage alone can flatter a fielder who simply gets to fewer of them.
- PO
- Putouts — outs recorded by the fielder (catch, tag, force)
- A
- Assists — throws or deflections that led to an out
- E
- Errors charged by the official scorer
- Innings, G
- Defensive innings played and games played
Worked examples
Shortstop: 250 PO, 400 A, 15 E
250 + 400 = 650 clean plays out of 665 chances is .977. Over 150 games that is 4.33 plays per game, and over 1,300 innings 9 × 650 ÷ 1,300 = 4.50 per nine.
First baseman: 1,200 PO, 90 A, 6 E
1,290 ÷ 1,296 = .995, normal for a first baseman who records most putouts on routine throws. 1,180.2 innings is 1,180⅔, so RF/9 = 9 × 1,290 ÷ 1,180.67 = 9.83.
Youth outfielder: 18 PO, 2 A, 3 E
20 clean plays in 23 chances is .870 — three errors weigh heavily on a small sample. That is about 13 errors per 100 chances.
Frequently asked questions
How do you calculate fielding percentage?+
Add putouts and assists, then divide by total chances (putouts + assists + errors). A player with 300 putouts, 50 assists and 7 errors fields (350 ÷ 357) = .980.
What is a good fielding percentage?+
It depends on position. In MLB, first basemen and catchers often exceed .990, outfielders about .985, second basemen .980, shortstops .970 and third basemen around .960.
Are hits counted as errors?+
No. Only plays the official scorer rules an error count against the fielder. Balls the fielder cannot reach are hits and do not affect fielding percentage, which is why range factor is a useful companion.
What is range factor in baseball?+
Range factor is putouts plus assists per nine defensive innings (or per game). It shows how many plays a fielder makes, rewarding those who cover more ground.
Why is fielding percentage criticised?+
A slow fielder who never reaches difficult balls makes few errors and can post a high fielding percentage. Modern metrics such as defensive runs saved and outs above average try to capture range as well.