Stolen Base Percentage Calculator

Stolen Base Percentage Formula

Stolen base percentage measures successful steals as a share of official steal attempts. Attempts equal stolen bases plus times caught stealing:

SB is stolen bases and CS is caught stealing. A player with no stolen bases and no caught-stealing events has no defined percentage because no attempt has been recorded.

Next-Attempt Scenarios

The calculator shows how one more successful steal or one more caught-stealing event would change the rate. Both scenarios add one attempt, but only a success adds to the numerator.

Consecutive Steals Needed for a Target

Target mode assumes every added attempt succeeds and finds the smallest whole number that satisfies:

Here A = SB + CS and t = T / 100. T is the entered target percentage, greater than 0 and no more than 100. For T below 100, the additional-success threshold is [T * (SB + CS) - 100 * SB] / (100 - T). Use the smallest nonnegative whole count that meets the exact target. An existing qualifying rate needs zero successes; no recorded attempts require one success to establish a rate. After any caught-stealing event, finite later successes cannot restore exactly 100 percent. Display rounding does not change the requested target.

Example

Thirty stolen bases and ten caught-stealing events produce 40 attempts. Dividing 30 by 40 gives a 75 percent stolen base rate.

Interpretation and Limitations

• Use totals from one player, team, season, or other consistent scope.
• Official scoring rules determine whether a baserunning out is recorded as caught stealing.
• Raw success rate does not account for score, inning, count, runner speed, catcher, pitcher, or expected run value.
• The target mode is arithmetic only and is not advice to attempt a steal.

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Sources

Major League Baseball glossary: Stolen-base Percentage and Caught Stealing.

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