Basal Area Calculator

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Single tree: one DBH value. Stand: enter multiple DBH values separated by commas to get total and per-area basal area.
Diameter measured at 1.3 m (4.5 ft) above ground level.
cm
Basal area (single tree)
0.0491

Cross-sectional area of the tree trunk at breast height

Basal area for this tree: 0.0491 m2

  • A 25 cm DBH tree has a trunk cross-section of 0.0491 m2 at breast height.
  • Basal area grows with the square of diameter: doubling the DBH quadruples the basal area.
  • This single-tree value is used to estimate timber volume, biomass, and carbon stocks.

Next stepSwitch to Stand mode to enter multiple trees and get the stand-level basal area per hectare or acre.

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