Enter the diameter at breast height (DBH) of a tree and the number of trees per acre into the calculator to determine the basal area per acre. This calculator helps in forest management and timber estimation.

## Basal Area Per Acre Formula

The following formula is used to calculate the basal area per acre.

BA = (pi * (DBH/2)^2 / 144) * N

Variables:

- BA is the basal area per acre (square feet)
- DBH is the diameter at breast height of a tree (inches)
- N is the number of trees per acre

To calculate the basal area per acre, use the formula to first calculate the basal area of a single tree using its diameter at breast height, then multiply by the number of trees per acre.

## What is Basal Area?

Basal area is a term used in forestry to describe the cross-sectional area of a tree trunk at breast height (4.5 feet above ground) per acre of forest. It is a measure of the density of trees on a plot and is used to estimate the volume of timber in a forest and to plan for sustainable forest management.

## How to Calculate Basal Area Per Acre?

The following steps outline how to calculate the Basal Area Per Acre.

- Measure the diameter at breast height (DBH) of a tree in inches.
- Count the number of trees per acre (N).
- Use the formula to calculate the basal area of a single tree: BA Tree = (pi * (DBH/2)^2) / 144.
- Multiply the basal area of a single tree by the number of trees per acre to find the total basal area per acre: BA = BA Tree * N.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem :**

Use the following variables as an example problem to test your knowledge.

Tree Diameter at Breast Height (DBH) = 12 inches

Number of Trees Per Acre = 100