Spike's Calculators


Basal Area from Girth Measured @ Breast Height in Centimetres

Spike VM

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

Girth of tree is measured at 1.3 metres above the ground. To calculate for one tree:
Basal area in sq m = (girth ÷ 3.14159)² * 0.00007853975


circumference of tree measured @ breast height = 76 centimetres
76 ÷ 3.14159 =  24.19
24.19 * 24.19 = 585.2321453666172 * 0.00007853975 =  0.04596 sq metres of basal area

Basal Area from Tree Girth Measured @ BH

Girth cm
Average Bark Thickness cm
Decimal Rounding (# of digits in result) #


Diameter in
Area in Square Metres


  1. tree girth measured @ breast height in centimetres
  2. average thickness of bark in centimetres
  3. decimal rounding preset @ 5


  1. diameter of tree in centimetres
  2. basal area of tree in square metres (if no value is used for bark thickness, basal area and diameter of tree includes the bark)
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