This stat measures a team's ability to shoot 2-point and 3-point shots.
A team's field goal percentage is calculated by the number of shots attempted divided by the number of shots made. This includes both 2-point and 3-point shots.
FG% = FGM/FGA * 100
For example, in the 2016 NCAA Tournament Semifinal match up between Villanova and Oklahoma, Villanova made 35 shots and attempted 49.
Villanova's field goal percentage was 71%.
FG% = 35/49 = 0.714 * 100
Effective field goal percentage takes into account that a 3-point field goal is worth more than a 2-point field goal.
eFG% = (.5 * 3FGM + FGM) / FGA * 100
Villanova made 11 3-point shots and attempted 18 in the same game. 11 of their 35 made shots were worth 3 points. And 18 of their 49 shot attempts were 3-pointers.
Villanova's eFG% was 83%.
(eFG% = (.5 * 11 + 35) / 49 = 0.826 * 100)
Effective field goal percentage indicates how easily a team scores most of its points. A higher percentage shows a team is efficient at shooting and likely has a chance to win many games.
A team's ability to defend or lower their opponent's eFG% is equally important. If a team can hold their opponent to a lower eFG%, the better chance it has to win.