Range Factor (RF) Calculator (Baseball)

RF Calculator

What is Range Factor?

Range factor is a baseball fielding metric that evaluates putouts and assists to the number of innings played, multiplied by the standard number of innings in a game. The number produced signifies the averaged number of outs and assists per 9 innings.
RF is often best at comparing specific positions (1st base vs 1st base players, left fielders vs left fielders, etc.) as opposed to comparing the ability of a 1st baseman compared to a left fielder (a first baseman will be very active on every play, while a left fielder is not as likely to see as many opportunities.
Critics of RF note that a player’s ranger factor can be heavily influenced by the quality of players around them – 1st base, for example, relies heavily on the quality of throws made to the position to catch batters out.

How to calculate Range Factor

In Baseball, Range Factor is calculated as:
RF = (Standard Innings per Game x (Putouts + Assists)) / (Innings Played + (Outs (Partial Innings) Played / 3))


A fielder has 190 putouts and 43 assists over 202 1/3 innings. The league they play in has 9 innings as regulation length for a game.
RF = (9 x (190 + 43)) / (202 + (1 / 3))
RF = (9 x (190 + 43)) / (202 + (1 / 3))
RF = (9 x 233) / 202.333333
RF = 2097 / 202.333333
RF = 10.36
This fielder’s range factor would be 10.36, or an average of 10.36 outs and assists per 9 innings of play.

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