Spike's Calculators

Determine the area, in hectares, for a circular fixed area plot.

diameter ÷ 2 = radius A = πR² ÷ 10000 (there are 10000 m² in one hectare) where A = area R = radius π = 3.14159

diameter = 15.96 metres (m) 15.96 ÷ 2 = 7.98 -- radius = 7.98 metres (m) 3.14159 * ( 7.98 * 7.98) ÷ 10000 = A 3.14159 * 63.6804 = 200.057707836 ÷ 10000 = 0.02 hectare or 1 ÷ 0.02 = 1 : 50 of a hectare

- the diameter of the plot in metres
- select number of digits required for the result

- the area of the plot in square metres
- the plot area in (part of) hectares
- fraction of an hectare

- 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