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# How Is RPI Calculated?

Just about every Selection Sunday when the Division I NCAA Men's Basketball Tournament field is announced, some pundit and insider will discuss how the selection committee can't ignore one team's RPI ranking from the regular season.

But what is this strange college basketball metric? In a nutshell, the Rating Percentage Index combines a team's own winning percentage with the team’s strength of schedule. The formula is easy, but the actual RPI rating calculation takes some data mining.

## The Basic RPI Formula

A basketball team’s RPI is calculated by using 3 factors: the team's winning percentage, the opponent's winning percentage and the winning percentage of opponents that played the opponent.

• 25 percent of the team's winning percentage
• 50 percent of the team’s opponents average winning percentage (OWP)
• 25 percent of its opponent's opponent's average winning percentage (OOWP)
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## Example of an RPI Calculation

Example: A team with a record of 8-0, opponents' winning percentage of .600 and opponents' opponents' winning percentage of .450 would have an RPI of 0.6625. That would read:

(1.000 x 0.25) + (0.600 x 0.50) + (0.450 x 0.25) or 0.2500 + 0.3000 + 0.1125= 0.6625.

The most difficult part of this ranking system is tracking down the wins and losses of opponents and opponent's opponents records for the calculations.