Run average

In baseball statistics, run average (RA) refers to measures of the rate at which runs are allowed or scored. For pitchers, the run average is the number of runs—earned or unearned—allowed per nine innings. It is calculated using this formula:

${\displaystyle \mathrm {RA} =9\cdot {\frac {\mathrm {R} }{\mathrm {IP} }}}$

where

• R = Runs
• IP = Innings pitched

Run average for pitchers differs from the more commonly used earned run average (ERA) by adding unearned runs to the numerator. This measure is also known as total run average (TRA) or runs allowed average. For batters, the run average is the number of runs scored per at bat.^[1]