Free forestry calculator

Basal Area Calculator

Estimate forest basal area per acre from average DBH and sample plot tree counts.

Calculator

Enter your measurements above.

How to use it

Basal area is the cross-sectional area of tree stems at breast height, commonly expressed as square feet per acre. This simplified tool assumes one average DBH for the measured trees; a tree-by-tree tally is more accurate.

Planning estimate: Field conditions, sampling method, tree form, defects, and local forestry standards can materially change results. Use professional cruising and appraisal methods for timber-sale decisions.