Spike's Calculators

Calculate the basal area of a tree in square metres from a diameter in centimetres measured at breast height.

To calculate for one tree:Basal area in square metres = pi * (DBHcm)² / 40000

diameter measured @ breast height = 34 centimetres 34 * 34 = 1156 * 3.14159 = 3631.67804 ÷ 40000 = 0.090791951 m²

- diameter of tree measured @ breast height in centimetres
- decimal rounding preset @ 5

- basal area of tree in square metres

- Area of a Circle from Diameter in Metres
- Area of a Circle from Foot and Inch Diameter
- Basal Area from Diameter in Centimetres
- Basal Area from Diameter in Inches
- Basal Area from Girth Measured @ Breast Height in Centimetres
- Basal Area from Girth Measured @ Breast Height in Inches
- Circumference (Girth) of a Log from Diameter, Foot and Inch
- Convert Diameter in Centimetres to Girth in Inches
- Circumference (Girth) of a Log from Diameter, Inch and Fraction
- Diameter of Tree from Circumference Measurement
- Diameter/Centimetres to Inches/Quarter Girth
- Fixed Area Plot, Acres
- Fixed Area Plots, Hectares
- Number of Trees and Tree Spacing Calculated from Basal Area
- Square Feet (Quarter Girth) to Square Centimetres
- Square Feet (Quarter Girth) to Square Metres
- Trees per Hectare to Trees per Acre
- Trees per Acre to Trees per Hectare