Knowing the number of trees per acre is important in a number of circumstances including the application of pesticides, the determination of the number of available trees for harvest and just to keep track of the trees on the property. Actually marking off an acre and counting the trees is one option. A more efficient method involves mathematical calculations and works well if the trees are spaced evenly in both the distance between the trees within the row and the spacing between rows. In some situations the distances can be averaged if the tree spacing is not consistent.
Things You'll Need
- Tape measure
Measure the distance between trees in the row. This spacing is often uniform in planted woodlots. State this measurement in feet with a single decimal position as in "trees are spaced 10.5 feet apart." If the trees aren't evenly planted, measure several and divide the sum the measurements by the number of trees.
Measure the distance between the rows of trees. Again, state this in feet with a single decimal position. Average the row spacing if it's inconsistent.
Multiply the distance between the trees and the rows of trees to determine the square feet of space allowed for each tree in the woodlot. For example, if the trees are spaced 10 feet apart in rows that are 15 feet apart each tree has a 150 sq. ft. area within the woodlot.
Divide the number of sq. ft. in an acre, 43,560, by the number of square feet allotted each tree. For example, if each tree was allotted 150 sq. ft., the number of trees per acre is 290.4.
Tips & Warnings
- A number of websites, such as resources.cas.psu.edu and warnell.forestry.uga.edu provide tables where you can cross-reference the tree spacing and row spacing to determine the number of trees per acre. Other tree rates per acre include the number of trees of a certain size. This is often determined by counting the trees or by measuring the average distance between trees of the proper size. You can then use the standard formula.
The Average Height of Oak Trees
While not the tallest trees, the many varieties of oak tree are still impressively large. Often used as shade trees, oaks also...
How to Figure Tree Weight
Some people can go their whole lives without needing to weigh a tree. If you're not one of them, you may be...
How to Calculate Soybean Seeds Per Acre
For soybean farmers, achieving the optimum soybean plant population is important -- you want to utilize your ground for the greatest economic...
How to Calculate Tree Density
Tree density gives foresters an idea of how closely trees are growing in a given area. This value is always expressed as...
How to Calculate Timber Harvest
Owners of small, private forests who are planning to sell some of their trees for lumber often need to estimate the volume...
How Many Apple Trees Do I Plant Per Acre?
Apples are a greatly popular and versatile fruit which grows amply in pretty much all climates. When planning to plant apples there...