The rating shown for each conference is the simple average of all of its teams. Other raters (Sagarin, for example) advocate for slightly different calculations, but in my experience this one works well enough.
Rank Conference Mean Rating ---- ------------------------- ----------- 1 SEC 3.31 2 Big 10 2.66 3 Big 12 2.51 4 Big East 1.69 5 ACC 1.43 6 Mountain West 0.78 7 West Coast 0.41 8 Atlantic 10 0.33 9 Missouri Valley 0.25 10 Conference USA 0.17 11 American -0.01 12 Big West -0.25 13 Ivy League -0.35 14 Southern -0.45 15 Big South -0.46 16 Coastal -0.56 17 Horizon -0.64 18 Southland -0.71 19 WAC -0.72 20 Mid-American -0.74 21 Sun Belt -0.78 22 Summit -0.82 23 Big Sky -0.94 24 Atlantic Sun -1.14 25 MAAC -1.20 26 Ohio Valley -1.27 27 America East -1.37 28 Patriot -1.40 29 MEAC -1.59 30 Northeast -1.70 31 SWAC -1.98 32 Non-Division I -5.95