About Diamond64
Diamond64 is a free platform for NCAA Division I college baseball. Live scores, RPI rankings, team resumes, bracket projections, and a what-if simulator — all in one place.
RPI Formula
The Rating Percentage Index (RPI) is calculated as:
- WP — Weighted winning percentage (road wins weighted 1.3×, home wins 0.7×, neutral 1.0×)
- OWP — Opponents' winning percentage (excluding games against the team in question)
- OOWP — Opponents' opponents' winning percentage
Our RPI values may differ slightly from official NCAA rankings due to differences in game data timing, exhibition/non-countable game handling, and rounding.
Quadrant Thresholds
Games are classified into quadrants based on the opponent's RPI rank and the game location:
| Quadrant | Home | Neutral | Away |
|---|---|---|---|
| Q1 | RPI 1–15 | RPI 1–25 | RPI 1–40 |
| Q2 | RPI 16–40 | RPI 26–50 | RPI 41–80 |
| Q3 | RPI 41–100 | RPI 51–125 | RPI 81–160 |
| Q4 | RPI 101+ | RPI 126+ | RPI 161+ |
Bracket Scoring Weights
Each team receives a composite bracket score used to project the NCAA Tournament field of 64:
| Factor | Weight |
|---|---|
| RPI Rank | 40% |
| Q1 + Q2 Record | 25% |
| Conference Record | 10% |
| Last 10 Games | 10% |
| Strength of Schedule | 10% |
| Road Record | 5% |
The top 16 teams by bracket score host regionals. Regional assignments use geographic proximity (haversine distance) with same-conference avoidance.
Data Sources
- Game scores and schedules from the NCAA's public scoreboard data
- Team coordinates from the U.S. Department of Education College Scorecard API
- Watch and stats links scraped from team athletic websites
FAQ
How often is data updated?
Scores are synced every 15 minutes during game days. RPI rankings and bracket projections are recalculated nightly. Schedules are updated daily.
Why does my team's RPI differ from the official NCAA ranking?
Minor differences can occur due to game data timing (we may include or exclude games at different cutoff times), handling of exhibition or non-countable games, and rounding differences. Our formula follows the standard NCAA RPI methodology.
How does the what-if simulator work?
The simulator downloads all D1 game results and runs the full RPI calculation in your browser. When you toggle game outcomes, it recalculates RPI rankings for all ~300 teams instantly — no server round-trip needed.
Is this affiliated with the NCAA?
No. Diamond64 is an independent, fan-built project. It is not endorsed by, affiliated with, or sponsored by the NCAA or any member institution.