The following table will help you determine the number of trees needed, per acre, based upon tree spacing.
| Spacing (feet) | Tree (number) | Spacing (feet) | Tree (number) | Spacing (feet) | Tree (number) |
2x2 | 1,890 | 7x9 | 691 | 12x15 | 242 |
3x3 | 4,840 | 7x10 | 622 | 12x18 | 202 |
4x4 | 2,722 | 7x12 | 519 | 12x20 | 182 |
4x5 | 2,178 | 7x15 | 415 | 12x25 | 145 |
4x6 | 1,815 | 8x8 | 681 | 13x13 | 258 |
4x7 | 1,556 | 8x9 | 605 | 13x15 | 223 |
4x8 | 1,361 | 8x10 | 544 | 13x20 | 168 |
4x9 | 1,210 | 8x12 | 454 | 13x25 | 134 |
4x10 | 1,089 | 8x15 | 363 | 14x14 | 222 |
5x5 | 1,742 | 8x25 | 218 | 14x15 | 207 |
5x6 | 1,452 | 9x9 | 538 | 14x20 | 156 |
5x7 | 1,245 | 9x10 | 484 | 14x25 | 124 |
5x8 | 1,089 | 9x12 | 403 | 15x15 | 194 |
5x9 | 968 | 9x15 | 323 | 15x20 | 145 |
5x10 | 871 | 10x10 | 436 | 15x25 | 116 |
6x6 | 1,210 | 10x12 | 363 | 16x16 | 170 |
6x7 | 1,037 | 10x15 | 290 | 16x20 | 136 |
6x8 | 908 | 10x18 | 242 | 16x25 | 109 |
6x9 | 807 | 11x11 | 360 | 18x18 | 134 |
6x10 | 726 | 11x12 | 330 | 18x20 | 121 |
6x12 | 605 | 11x15 | 264 | 18x25 | 97 |
6x15 | 484 | 11x20 | 198 | 20x20 | 109 |
7x7 | 889 | 11x15 | 158 | 20x25 | 87 |
7x8 | 778 | 12x12 | 302 | 25x25 | 70 |
Each tree species is different in its need for sunlight, moisture, and soil type. Different trees grow at different rates. Some mature in 40 years, others take a hundred. Ask a forestry professional if you have questions about which trees to plant on a given site. Find your local forestry office.