Enter the team’s winning percentage (WP), the adjusted opponents’ winning percentage (OWP), and the adjusted opponents’ opponents’ winning percentage (OOWP) to determine the RPI.

RPI Calculator

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RPI Formula

The following traditional weighting was used by the NCAA for the Ratings Percentage Index (RPI):

RPI = .25 * WP + .5 * OWP + .25 * OOWP
  • Where RPI is the Ratings Percentage Index
  • WP is the team's winning percentage
  • OWP is the team's opponents' average winning percentage, typically calculated by taking each opponent’s winning percentage excluding games against the team being evaluated, then averaging across opponents
  • OOWP is the opponents' opponents' average winning percentage, typically calculated by taking each opponent’s OWP (built from those exclusions) and averaging across opponents

The last two portions of this formula are considered the team's strength of schedule.

OWP and OOWP are generally computed as simple (unweighted) averages across opponents. For example, if two opponents have adjusted winning percentages of 50% and 100%, the average would be 75%.

RPI Definition

RPI, short for Ratings Percentage Index, is a metric used by the NCAA (in various sports and historically in basketball) to rank or compare teams based on their winning percentage and their strength of schedule.

The strength of schedule (SOS), as mentioned above, includes both the team's direct opponents' winning percentages and the winning percentage of those opponents' opponents (as defined by OWP and OOWP).

Example Problem

How to calculate RPI?

First, determine the team's winning percentage. For this example, the team has won 75% of their games.

Next, determine the team's opponents' average winning percentage. In this case, this is found to be 60%.

Next, determine the average winning percentage of the opponents' opponents. For this example, this winning percentage is 40%.

Finally, calculate the RPI using the formula above:

RPI = .25 * WP + .5 * OWP + .25 * OOWP

RPI = .25 * 75 + .5 * 60 + .25 * 40

RPI = 58.75