The Minnesota Timberwolves have the worst winning percentage by a team when playing >500 games, winning 41.1 percent of the time.

lowest win percentage of nba teams all-time over 500 games

TEAM	GP	W%	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
Minnesota Timberwolves	2,794	.411	241.7	101.0	42.0	23.3	7.7	5.1	14.7	38.2	83.8	45.6	5.8	16.7	34.7	18.8	24.4	77.0	675,285	282,232	117,258	65,233	21,537	14,131	41,001	60,502
L.A. Clippers	4,360	.423	241.3	103.5	43.3	23.0	8.1	5.2		39.8	85.7	46.4	5.3	15.0	35.3	19.6	26.4	74.3	1,052,250	451,398	188,773	100,314	33,245	21,579		99,276
Brooklyn Nets	3,868	.428	241.6	101.8	43.4	22.8	8.2	5.3	16.3	38.6	85.2	45.3	5.5	15.8	34.6	19.5	26.0	75.1	934,645	393,890	167,789	88,027	31,845	20,487	62,956	88,971
Memphis Grizzlies	2,311	.432	241.8	98.9	41.9	22.0	8.1	5.1	14.9	37.2	82.5	45.1	6.7	19.1	34.8	17.9	23.8	74.9	558,915	228,663	96,776	50,835	18,825	11,849	34,319	48,684
Charlotte Hornets	2,713	.433	241.9	100.7	41.7	23.4	7.8	4.8	14.4	37.7	83.5	45.2	6.5	18.3	35.5	18.8	24.9	75.6	656,195	273,311	113,264	63,604	21,113	12,947	39,003	55,979
Washington Wizards	5,087	.447	241.6	104.8	46.8	22.8	7.9	5.0		40.7	89.1	45.7	4.9	14.2	34.4	20.0	26.9	74.2	1,229,230	533,038	238,079	115,951	32,603	20,452		115,377
Sacramento Kings	6,005	.458	241.7	104.9	47.9	23.6	8.2	4.6		40.1	88.8	45.1	5.5	15.5	35.6	21.5	28.6	75.0	1,451,375	630,187	281,507	141,696	33,837	18,885		143,799
Cleveland Cavaliers	4,353	.467	241.6	101.4	43.1	23.2	7.7	4.9		39.0	85.2	45.8	5.5	15.3	35.8	18.8	25.1	75.1	1,051,870	441,355	187,642	101,206	31,520	19,930		95,253
Orlando Magic	2,803	.469	241.5	101.2	42.8	22.0	7.5	4.8	15.0	37.9	83.2	45.5	7.1	20.1	35.3	18.4	25.0	73.5	676,970	283,709	120,012	61,729	21,062	13,413	42,111	58,932
New Orleans Pelicans	1,768	.470	241.8	101.8	42.9	22.7	7.6	4.7	14.0	38.3	83.8	45.7	7.8	22.0	35.7	17.4	22.8	76.5	427,495	179,983	75,852	40,137	13,401	8,252	24,790	35,800
Detroit Pistons	5,998	.471	241.6	102.2	48.4	22.0	7.8	4.9		39.0	88.3	44.2	5.2	15.0	34.7	21.2	28.6	73.9	1,449,045	613,153	284,186	131,855	32,097	20,102		141,210
Toronto Raptors	2,310	.474	241.9	101.2	41.9	22.1	7.8	5.1	14.0	37.7	83.4	45.1	7.8	21.7	35.9	18.1	23.5	77.0	558,800	233,784	96,724	51,156	17,948	11,808	32,265	49,831
Golden State Warriors	6,104	.486	241.6	105.8	50.3	23.4	8.8	5.1		40.5	91.3	44.3	6.3	17.4	36.2	21.1	28.4	74.1	1,474,585	645,711	295,064	143,048	36,055	20,797		144,084
New York Knicks	6,105	.487	241.9	102.0	47.9	22.2	7.9	4.4		39.0	87.7	44.5	5.7	16.3	35.3	20.7	27.8	74.4	1,476,825	622,891	281,333	135,387	32,401	17,871		147,521
Atlanta Hawks	5,938	.493	241.6	103.0	48.4	22.7	8.3	5.0		38.9	87.5	44.5	5.6	15.9	35.0	21.8	29.1	74.8	1,434,515	611,675	284,494	134,959	34,122	20,736		140,757
Indiana Pacers	3,868	.499	241.6	103.6	43.2	23.6	8.0	5.1	15.9	39.3	84.6	46.5	5.6	15.7	35.7	19.7	25.7	76.8	934,520	400,603	167,118	91,412	31,100	19,740	61,380	89,329
Denver Nuggets	3,869	.505	241.6	107.8	44.2	24.6	8.5	5.4	16.0	40.9	87.9	46.5	5.4	15.7	34.7	20.9	27.5	76.0	934,585	416,887	171,109	95,340	32,705	20,775	61,712	89,412
Dallas Mavericks	3,543	.507	241.7	103.9	42.6	22.6	7.4	4.7	14.1	39.2	85.1	46.1	6.4	18.0	35.6	19.1	24.7	77.2	856,270	368,162	150,949	80,139	26,059	16,558	50,012	76,092
Chicago Bulls	4,680	.509	241.8	102.7	45.4	23.7	8.0	4.8		39.6	86.3	45.9	5.0	14.2	35.3	19.7	26.0	75.7	1,131,775	480,608	212,369	111,084	32,762	19,826		104,832
Houston Rockets	4,606	.514	241.5	105.5	45.3	23.5	8.1	5.1		40.1	87.2	46.0	6.8	19.6	34.9	19.9	26.4	75.3	1,112,515	486,099	208,476	108,013	33,238	21,083		102,898
Philadelphia 76ers	5,941	.522	241.7	104.7	48.9	22.8	8.7	5.5		39.5	88.3	44.7	4.9	14.2	34.4	22.7	30.2	75.1	1,436,065	621,895	287,253	135,418	35,989	22,587		138,589
Portland Trail Blazers	4,362	.525	241.7	105.2	44.2	23.5	8.1	5.0		40.2	86.4	46.5	5.7	16.1	35.5	20.0	26.5	75.5	1,054,130	458,707	192,826	102,611	33,453	20,467		98,620
Miami Heat	2,885	.527	241.9	99.5	41.9	21.9	7.6	4.8	15.0	37.2	81.0	46.0	6.9	19.3	35.8	18.1	24.3	74.5	697,775	286,995	120,968	63,043	22,036	13,979	43,266	62,709
Milwaukee Bucks	4,525	.528	241.6	105.2	43.7	24.2	8.4	4.9		40.7	86.6	47.0	5.7	16.0	35.7	19.2	25.3	75.6	1,093,250	475,995	197,947	109,493	34,632	20,094		103,855
Oklahoma City Thunder	4,606	.536	241.6	105.9	44.8	23.3	8.8	5.0		40.5	87.3	46.4	5.8	16.3	35.3	20.5	27.0	75.7	1,112,990	487,957	206,351	107,483	36,014	20,449		106,147