R.R.A.^® applies to situations with inherited base runners. To calculate R.R.A.^®, only use instances where there is at least one runner on base when that relief pitcher enters the game. To calculate R.R.A.^®, take the following steps:

1) Determine the out factor (O), based upon how many outs there are when the pitcher enters the game:
If there are 0 outs, O = 2
If there is 1 out, O = 3
If there are 2 outs, O = 6

2) Determine the base factors (R1), (R2) and (R3) and (R) based upon which, if any, inherited base runner(s) scored:
If an inherited base runner from 1st base scored, R1 = 2.54. If not R1 = 0.
If an inherited base runner from 2nd base scored, R2 = 1.48. If not R2 = 0.
If an inherited base runner from 3rd base scored, R3 = 1.00. If not R3 = 0.
R = R1 + R2 + R3.

3) Multiply (O x R x 1.55) to calculate the pitcher's R.R.A.^® for that game. 1.55 is a multiplier constant that it used to make R.R.A.^® comparable to ERA. This provides statisticians and baseball fans a familiar and simple scale to understand and compare relief pitchers' abilities in situations with inherited runners.

If you wish to calculate a pitcher's R.R.A.^® over multiple games, find the sum of all R.R.A.s^® in that set of games and divide it by that number of games. For example, if a pitcher makes four appearances with inherited runners over the course of a season, with R.R.A.s^® of 0.00, 1.00, 2.00, and 3.00, his R.R.A.^® for that season would equal 1.50.

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