Trees Per Acre by Spacing

Spacing		Trees		Spacing		Trees
Feet	Meters	Acre	Ha.	Feet	Meters	Acre	Ha.
5 x 5	1.5 x 1.5	1,742	4,304
5 x 6	1.5 x 1.8	1,452	3,588	12 x 12	3.7 x 3.7	302	746
5 x 7	1.5 x 2.1	1,245	3,076	12 x 15	3.7 x 4.6	242	598
5 x 8	1.5 x 2.4	1,089	2,691	12 x 18	3.7 x 5.5	202	499
5 x 9	1.5 x 2.7	968	2,392	12 x 20	3.7 x 6.1	182	448
5 x 10	1.5 x 3.0	871	2,152	12 x 25	3.7 x 7.6	145	358

6 x 6	1.8 x 1.8	1,210	2,990	13 x 13	4.0 x 4.0	258	638
6 x 7	1.8 x 2.1	1,037	2,562	13 x 15	4.0 x 4.6	223	551
6 x 8	1.8 x 2.4	908	2,244	13 x 20	4.0 x 6.1	168	415
6 x 9	1.8 x 2.7	807	1,994	13 x 25	4.0 x 7.6	134	331
6 x 10	1.8 x 3.0	726	1,794
6 x 12	1.8 x 3.7	605	1,495	14 x 14	4.3 x 4.3	222	549
6 x 15	1.8 x 4.6	484	1,196	14 x 15	4.3 x 4.6	207	511
				14 x 20	4.3 x 6.1	156	385
7 x 7	2.1 x 2.1	889	2,197	14 x 25	4.3 x 7.6	124	306
7 x 8	2.1 x 2.4	778	1,922
7 x 9	2.1 x 2.7	691	1,707	15 x 15	4.6 x 4.6	194	479
7 x 10	2.1 x 3.0	622	1,537	15 x 20	4.6 x 6.1	145	358
7 x 12	2.1 x 3.7	519	1,282	15 x 25	4.6 x 7.6	116	287
7 x 15	2.1 x 4.6	415	1,025
				16 x 16	4.9 x 4.9	170	420
8 x 8	2.4 x 2.4	681	1,683	16 x 20	4.9 x 6.1	136	336
8 x 9	2.4 x 2.7	605	1,495	16 x 25	4.9 x 7.6	109	269
8 x 10	2.4 x 3.0	544	1,344
8 x 12	2.4 x 3.7	454	1,222	18 x 18	5.5 x 5.5	134	331
8 x 15	2.4 x 4.6	363	897	18 x 20	5.5 x 6.1	121	299
8 x 25	2.4 x 7.6	218	539	18 x 25	5.5 x 7.6	97	240

9 x 9	2.7 x 2.7	538	1,329	20 x 20	6.1 x 6.1	109	269
9 x 10	2.7 x 3.0	484	1,196	20 x 25	6.1 x 7.6	87	215
9 x 12	2.7 x 3.7	403	996
9 x 15	2.7 x 4.6	323	798	25 x 25	7.6 x 7.6	70	173

Service Forester's Handbook