Single Season EFF Leaders

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?	Player	Team	EFF	Year
1	Wilt Chamberlain	PH1	52.29	1961-62
2	Wilt Chamberlain	SFW	50.59	1962-63
3	Wilt Chamberlain	PHI	45.76	1965-66
4	Wilt Chamberlain	PH1	45.58	1960-61
5	Wilt Chamberlain	PHI	45.54	1966-67
6	Wilt Chamberlain	SFW	44.60	1963-64
7	Wilt Chamberlain	PH1	43.83	1959-60
8	Kareem Abdul-jabbar	LAL	42.99	1975-76
9	Wilt Chamberlain	PHI	42.80	1967-68
10	Kareem Abdul-jabbar	MIL	42.59	1971-72
11	Bob McAdoo	BUF	40.76	1973-74
12	Oscar Robertson	CIN	40.51	1961-62
13	Elgin Baylor	LAL	40.19	1960-61
14	Kareem Abdul-jabbar	MIL	39.68	1973-74
15	Bob McAdoo	BUF	39.43	1974-75
16	Elgin Baylor	LAL	39.31	1961-62
17	Oscar Robertson	CIN	39.15	1963-64
18	Kareem Abdul-jabbar	MIL	39.12	1972-73
19	Kareem Abdul-jabbar	MIL	38.91	1974-75
20	Kareem Abdul-jabbar	MIL	38.88	1970-71
21	Kareem Abdul-jabbar	LAL	38.02	1976-77
22	Walt Bellamy	CH2	37.96	1961-62
23	Oscar Robertson	CIN	37.49	1964-65
24	Bob Pettit	STL	37.31	1961-62
25	Michael Jordan	CHI	36.99	1988-89
26	Oscar Robertson	CIN	36.81	1962-63
27	Oscar Robertson	CIN	36.42	1960-61
28	Oscar Robertson	CIN	36.41	1965-66
29	Bob Pettit	STL	36.17	1960-61
30	Elgin Baylor	LAL	35.98	1962-63
31	Bob McAdoo	BUF	35.91	1975-76
32	Bill Russell	BOS	35.39	1959-60
33	Bill Russell	BOS	35.38	1961-62
34	Oscar Robertson	CIN	35.13	1966-67
35	Michael Jordan	CHI	35.05	1987-88
36	Hakeem Olajuwon	HOU	34.73	1992-93
37	Wilt Chamberlain	LAL	34.68	1968-69
38	Kareem Abdul-jabbar	LAL	34.68	1978-79
39	Michael Jordan	CHI	34.57	1989-90
40	Walt Bellamy	CH2	34.40	1962-63
41	Larry Bird	BOS	34.39	1984-85
42	Kareem Abdul-jabbar	LAL	34.39	1977-78
43	Jerry Lucas	CIN	34.37	1967-68
44	Bob Lanier	DET	34.30	1973-74
45	Larry Bird	BOS	34.28	1986-87
46	Jerry Lucas	CIN	34.26	1964-65
47	Bill Russell	BOS	34.15	1963-64
48	Bill Russell	BOS	34.06	1964-65
49	Larry Bird	BOS	34.01	1987-88
50	David Robinson	SAS	34.00	1993-94
51	Shaquille O'neal	LAL	33.82	1999-00
52	Jerry Lucas	CIN	33.66	1968-69
53	Jerry Lucas	CIN	33.66	1965-66
54	Kareem Abdul-jabbar	MIL	33.63	1969-70
55	David Robinson	SAS	33.56	1990-91
56	Shaquille O'neal	ORL	33.48	1993-94
57	Oscar Robertson	CIN	33.46	1967-68
58	Bob Lanier	DET	33.46	1974-75
59	Charles Barkley	PHI	33.46	1986-87
60	Bill Russell	BOS	33.32	1962-63
61	Magic Johnson	LAL	33.31	1988-89
62	Nate Archibald	KCO	33.18	1972-73
63	Bob Lanier	DET	33.16	1976-77
64	Kevin Garnett	MIN	33.13	2003-04
65	Moses Malone	HOU	33.12	1981-82
66	Bob Pettit	STL	32.99	1958-59
67	Nate Thurmond	SFW	32.92	1967-68
68	Kareem Abdul-jabbar	LAL	32.87	1979-80
69	Hakeem Olajuwon	HOU	32.83	1993-94
70	Bill Walton	POR	32.74	1976-77
71	Michael Jordan	CHI	32.71	1990-91
72	Bill Russell	BOS	32.70	1958-59
73	Charles Barkley	PHI	32.68	1988-89
74	David Robinson	SAS	32.63	1991-92
75	Wilt Chamberlain	LAL	32.61	1970-71
76	Moses Malone	HOU	32.60	1978-79
77	Charles Barkley	PHI	32.51	1987-88
78	Bill Russell	BOS	32.42	1960-61
79	LeBron James	CLE	32.42	2009-10
80	Bob Pettit	STL	32.41	1963-64
81	David Robinson	SAS	32.38	1994-95
82	Hakeem Olajuwon	HOU	32.38	1989-90
83	Patrick Ewing	NYK	32.34	1989-90
84	Walt Bellamy	BAL	32.34	1963-64
85	Bob Pettit	STL	32.29	1959-60
86	Elvin Hayes	CAP	32.23	1973-74
87	Kevin Garnett	MIN	32.07	2002-03
88	David Robinson	SAS	32.02	1995-96
89	Bill Russell	BOS	31.98	1966-67
90	Kevin Garnett	MIN	31.96	2004-05
91	Elgin Baylor	MIE	31.93	1959-60
92	Michael Jordan	CHI	31.91	1986-87
93	Karl Malone	UTA	31.88	1989-90
94	Hakeem Olajuwon	HOU	31.88	1994-95
95	Charles Barkley	PHO	31.84	1992-93
96	Magic Johnson	LAL	31.79	1986-87
97	Bob Pettit	STL	31.76	1962-63
98	Dave Cowens	BOS	31.69	1974-75
99	Moses Malone	HOU	31.68	1980-81
100	Charles Barkley	PHI	31.67	1989-90

Written and checked by the DatabaseBasketball editorial desk.

Career and season figures are read off the site’s own statistical tables; anything said about an operator is taken from the terms that operator publishes. A field with no source is left empty rather than filled in.

Updated 17 October 2026