|Batting Average (AVG): Divide the number of base hits by the total number of at bats.
||If Tony Gwynn has 600 at bats and has 206 hits.
His batting average would be .343 (206/600)
|Earned Run Average (ERA): Multiply the total number of earned runs by nine, and divide the results by the total innings pitched.
||Randy Johnson has allowed 67 runs in 220 innings.
Multiply 67 by 9: 67x9=603. Divide 603 by 220 (his innings pitched): 603/220=2.74 -- which is his ERA
|W-L percentage: Divide the number of games won by the total number of decisions.
||Pedro Martinez has a 16-3 record,
Divide his win total(16) by his total number of decisions: (19):16/19=0.842
|Slugging Percentage (SLG): Divide the total number of bases of all base hits by the total number of times at bat
||Sammy Sosa has 282 total bases and 440 at-bats.
Divide 282 by 440 to get his slugging percentage: 282/440=.641
|On-Base Percentage (OBP): Divide the total number of hits plus Bases on Balls plus hits by Pitch BY at Bats plus Bases on Balls plus hit by Pitch plus Sacrifice Flies
||In Derek Jeter's 434 at-bats, he has 152 hits, 59 walks, has been hit by 9 pitches, and he's hit 6 sacrifice flies.
So here's the formula to determine his on-base average:
|Fielding Average: Divide the total number of putouts and assists by the total number of putouts, assists and errors.
||Edgardo Alfonzo has 218 putouts and 290 assists, while committing only 2 errors.
So his fielding percentage is:
|Magic Numbers: Determine the number of games yet to be played, add one, then subtract the number of games ahead in the loss column of the standings from the closest opponent.
||So here's Texas' magic number:
Games remaining (50)+1=51. 51-7=44.
The Rangers' magic number to clinch the AL West is 44.