Range Factor (RF) Calculator (Baseball)

LAST UPDATE: March 8th, 2020

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 the quality of players around them heavily influences a player’s ranger factor – 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 calculates 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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