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What Is EFG% and Why Should You Measure It Instead of FG%

Did you know that 67% of the Houston Rockets' field goal attempts were from beyond the 3-point line in the 2018-2019 season? Traditional methods of measuring field goal percentage fail to separate two-point shots from three pointers. When it comes to analyzing these percentages, it is important to understand the weight of the different shots. We all understand the concept of risk and reward - here's how it plays out in basketball:

Let's assume player Jack only takes two-point shots and hits 6 of 12 (50%) from the field during Wednesday's game. Jack's made 12 points for the team - at 50% field goal percentage as well as a 50% EFG percentage. What is EFG, or effective field goal percentage, you may ask? Here's the simple formula:

Effective Field Goal% = ((Field Goals Made) + 0.5*3PT Field Goals Made)/(Field Goal Attempts)

Another player, John, took 12 shots from the field and only made 5 but because they are all from three-point territory - John generated 15 points during the game. John's shots are more valuable so the traditional field goal percentage fails to capture the additional value generated by these shots. John's FG% seems lower at 42 FG% but the EFG comes out to 62.5%, proving to have had a more efficient game than Jack.

6/12 2pt FG = 12 points, 50 FG% / 50% EFG

5/12 3pt FG = 15 points, 42 FG% / 62.5% EFG

Accounting for the additional value of a three-point shot is the primary reason effective field goal percentage was created and can more accurately describe how well a team can score. At the team level, EFG becomes particularly important as the increasing the ratio of three-point shots to two-point shots can drastically raise a team's EFG. This concept is one of the pillars of the Houston Rockets' "Moreyball" scheme.