Spike's Calculators


Brereton Log Rule Calculator - Metric

Spike VM

Calculate the Cubic Metre Volume of a Log using the Brereton Log Rule

  • Two diameter measurements shall be taken under bark at each log end perpendicular to each other (at both ends) and the final recorded diameter shall be the average of the two measurements in centimetres.
  • Lengths shall be measured-along a straight line parallel to the central axis of the log and shall be recorded to the nearest lower full odd or even centimetre.

Formula used:

V = 0.7854 * D² * L ÷ 10000
V = the volume in cubic metres (m³)
D = the average diameter measurement from both ends in centimetres (cm)
L = the length of the log in metres (m)
Diameter Measured Inside Bark = DIB
Average = Small End plus Large End Divided by Two
Length of Log in Meters M
DIB Average cm


Cubic Meter:
Cubic Foot: ft³
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