Use this forestry calculation to summarize a measured tree, plot, canopy, fuel, biomass, carbon, growth, density, or wood-volume quantity under a stated inventory convention.

Dbh Centimeters (cm)

Required number input.

Tree stem cross-sectional basal area at breast height in square metres from DBH in centimetres. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Basal Square Meters (m2)

The resulting basal square meters returned as a number.

• Inventory summaries depend on breast-height definition, inclusion threshold, plot design, bark treatment, slope correction, damaged stems, measurement error, and expansion weights. Arithmetic and basal-area-weighted means answer different questions.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Use locally validated equations and inventory protocols, retain species and measurement metadata, aggregate with appropriate plot expansion and sampling weights, and report uncertainty with stand-level results.

• Dbh From Circumference

  Diameter at breast height in centimetres from stem circumference at the same measurement height.

• Form Factor

  Tree stem form factor: measured stem volume divided by basal area times tree height.

• Height Diameter Ratio

  Dimensionless tree slenderness from height in metres divided by DBH converted from centimetres to metres.