Baseball is a game of countless tiny swings in fortune, and analysts rely on situational metrics to capture how each play changes the odds of victory.
The Situational Wins Saved statistic condenses those momentum shifts into a single number that reflects both win probability and leverage.
Use the calculator below to explore how dazzling defensive gems or late-inning plate appearances translate into hard, actionable wins added to your club’s ledger.
Situational Wins Saved Calculator
Frequently Asked Questions
What is Situational Wins Saved?
Situational Wins Saved, or SWS, converts the change in win probability on a single play into team wins by scaling it with the play’s leverage.
A positive figure means the player moved his club closer to victory; a negative figure means the opposite.
Why are win probabilities entered as percentages?
Percentages are familiar to most readers and they keep the necessary math simple.
Behind the scenes the calculator converts the numbers to decimal form before finishing the computation.
What is Leverage Index?
Leverage Index measures how critical a moment is within a game by comparing the possible swings in win probability to an average play.
A value of 1.0 is average, while 3.0 or higher usually signals a high pressure situation.
Where do I find win probability numbers?
Many public sites, including Baseball Savant and FanGraphs, publish live win probability charts.
You can also export play by play data from proprietary tracking systems if you need exact figures.
Does SWS replace traditional defensive metrics?
No. SWS highlights the game context value of a single event, but it does not evaluate overall fielding or batting ability across a season.
It is best used alongside larger sample statistics.