Basal Area

Use this to estimate the basal area of one tree and of a stand. Basal area is the trunk cross-section at breast height. For one tree it is the area of a circle from DBH. Stand basal area is that area times how many trees share the plot, assuming they all have the same DBH.

DBH: Trunk diameter at about 1.3 m above ground. Pick centimetres or inches.

Trees per area: Stand density in trees per hectare or trees per acre. The stand result follows that choice (m²/ha or ft²/acre).

Tree basal area: Cross-section of one trunk. Shown in m² or ft² to match the DBH unit.

Stand basal area: Tree basal area times density, per hectare or per acre.