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.

Sum Squared Dbh Cm 2 (cm2)

Required number input.

Tree Count

Required integer input.

Quadratic mean diameter in centimetres from the sum of squared DBHs and tree count. 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]

Quadratic Mean Centimeters (cm)

The resulting quadratic mean centimeters 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.

• Arithmetic Mean Diameter

  Arithmetic mean DBH in centimetres from summed diameters and measured tree count.

• Dominant Height

  Mean height of a selected dominant-tree sample from summed heights and sample tree count.

• Height Diameter Ratio

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