Most of the BW Baseball Online Almanac records are calculated using formulas adopted from Rule 10-29, “Determining Percentages,” of the NCAA Baseball Rules Book.
- Batting Average
The most popular measure of hitting prowess. Batting average is calculated by dividing the number of hits by the number of official at bats.
AVG = H / AB
- Earned Run Average
The average number of earned runs allowed per nine innings pitched. Earned run average is calculated by multiplying the number of earned runs by nine and dividing that product by the number of innings pitched. All per-game pitching averages in the Online Almanac are based on nine-inning games and are calculated in the same manner as earned run average.
ERA = ( ER × 9 ) / IP
- Fielding Percentage
The standard measure of fielding ability. Fielding percentage is calculated by dividing the total number of putouts and assists by the total number of putouts, assists and errors committed.
FLD = ( PO + A ) / ( PO + A + E )
- On-Base Percentage
A measure of the capacity for getting on base. On-base percentage is calculated by dividing the total number of hits, walks and times hit by a pitch by the total number of at bats, walks, times hit by a pitch and sacrifice fly balls.
OBP = ( H + BB + HBP ) / ( AB + BB + HBP + SF )
- Slugging Percentage
The standard measure of power-hitting capability. Slugging percentage is calculated by dividing the total number of bases from all hits by the number of official at bats.
SLG = ( 1B + 2 × 2B + 3 × 3B + 4 × HR ) / AB
- Winning Percentage
Winning percentage is calculated by dividing the number of games won by the total number of games played, with each tie game counted as half a win and half a loss.
PCT = ( W + T / 2 ) / ( W + L + T )
The BW Baseball Online Almanac records for stolen base percentage are calculated using the formula found in Total Baseball, the comprehensive baseball encyclopedia compiled by John Thorn and Pete Palmer.
- Stolen Base Percentage
The rate of successful stolen base attempts. Stolen base percentage is calculated by dividing the number of stolen bases by the number of stolen bases attempted.
SB% = SB / ( SB + CS )
The BW Baseball Online Almanac records for strikeout average are calculated using the same basic formula used to calculate batting average.
- Strikeout Average
A measure of strikeout frequency for batters. Strikeout average is calculated by dividing the number of times struck out by the number of official at bats.
K% = K / AB
