Volleyball RPI Explained

How the NCAA measures team strength — and why it matters for the tournament

What Is RPI?

The Rating Percentage Index (RPI) is a formula the NCAA uses to rank teams by the strength of their record. It was developed to answer a simple question: did you beat good teams, or did you pad your record against weak opponents?

Every Division I team gets an RPI between 0 and 1. Higher is better. A team with an RPI of 0.700 is generally considered elite; below 0.500 is below average for Division I competition.

See live RPI rankings on the RPI Rankings page, updated weekly through the season.

The Formula

RPI is a weighted average of three components:

ComponentWeightWhat it measures
Winning Percentage (WP)25%Your own win/loss record
Opponents' WP (OWP)50%Average record of teams you've played
Opponents' Opponents' WP (OOWP)25%How strong your opponents' opponents were

Notice that your own record only accounts for 25% of your RPI. Strength of schedule — who you played (50%) and how good those teams' schedules were (25%) — makes up the other 75%. This means a team with a 20–10 record against tough opponents can rank higher than a team with a 25–5 record against weak ones.

Home/Away Adjustments

The NCAA applies a location modifier to account for home-court advantage. A road win counts more than a neutral-site win, which counts more than a home win. Specifically:

  • Road win: counts as 1.3 wins
  • Neutral-site win: counts as 1.0 wins
  • Home win: counts as 0.7 wins
  • Road loss: 0.7 losses; home loss: 1.3 losses

bumpset.app offers both standard and location-adjusted RPI rankings. The official NCAA calculation uses location adjustments; our default view matches that.

RPI vs. Elo Power Ratings

RPI has one major limitation: it treats every win equally regardless of how dominant the performance was. A 3–0 sweep and a 3–2 five-setter against the same opponent produce the same RPI contribution.

Elo ratings address this by adjusting for set scores (margin of victory). Elo also updates dynamically after every match, so it reflects recent form better than RPI, which smooths performance over the full season. Our Elo Power Rankings are a better predictor of future results, but RPI is still what the selection committee officially weighs when building the tournament field.

Frequently Asked Questions

The top 25 typically have RPIs above 0.650. Teams inside the top 50 are generally safe for at-large consideration; teams ranked 51–75 are on the bubble. An RPI below 0.500 is unlikely to receive an at-large bid regardless of record.

Technically yes if they won their conference tournament (automatic bid), but not via at-large. The committee has rarely given at-large bids to teams below .500 even with favorable RPI.

Non-conference wins against top-RPI opponents boost your own RPI through the opponent winning percentage component. A win over a team with a .700 winning percentage counts more than a win over a .400 team.

RPI is based on winning percentage — it doesn't care whether you won by 3–1 or 3–0. Elo is margin-sensitive and updates dynamically after every match. Elo is generally a better predictor of future results, but RPI is what the committee officially uses.