Spike's Calculators


Basal Area from Diameter in Inches

Spike VM

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

To calculate for one tree:
Basal Area in sq ft = DBH² * 0.00545415391


diameter measured @ breast height = 11.4 inches
11.4 * 11.4 * 0.00545415391 = 0.7088 sq feet of basal area

Basal Area from Diameter in Inches

Diameter in
Decimal Rounding (# of digits in result) #


Area in Square Feet ft²


  1. diameter of tree measured @ breast height in inches
  2. decimal rounding preset @ 5


  1. basal area of tree in square feet
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