🌲 Basal Area Calculator
Estimate the cross-sectional area of tree stems to assess stand density and timber volume.
How to Use This Calculator
Measure DBH
Use a diameter tape or calipers at 4.5 ft (1.37 m) above ground.
Count trees
Enter the number of stems with similar DBH or repeat for different size classes.
Compare to stocking guides
Use basal area to evaluate thinning needs or stand density indices.
Formula
Basal Area (sq ft) = 0.005454 × DBH2
DBH is measured in inches. Multiply by tree count to obtain stand basal area for the sample group.
Full Description
Basal area represents the cross-sectional area of a tree trunk at breast height and is a key metric in forestry for estimating stand density, competition, and timber yield.
Combine basal area data with stocking charts or growth models to guide thinning, regeneration, and habitat management decisions.
Frequently Asked Questions
Can I use centimeters?
Yes. Convert DBH to inches first (1 in = 2.54 cm) or adjust the factor accordingly.
How do I compute basal area per acre?
Multiply sample basal area by the appropriate expansion factor based on your plot size.
Does basal area consider multiple stems?
Measure each stem with DBH ≥ 4.5 inches or use quadratic mean diameter for clumps.
What is a good basal area?
It depends on species and management goals. Consult regional stocking guides for target ranges.