The metric version of the Brereton log rule calculates the volume of a log in cubic metres.
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 log's central axis and recorded to the nearest lower full odd or even centimetre.
V = 0.7854 * D² * L ÷ 10000where