"Measuring of Roundwood" as recommended by the Timber Measurement Council

Measuring log volume using small and large end diameter measurements.
Small end - large end diameter measurement may be used for all tree species on logs with a top diameter of ≥ 3 cm and length ≤ 6.5 m.
The diameter is measured 10 cm from each end of the log, with the exception of the butt end of a butt log, where the measurement is taken 50 cm from the end.

Formula used:

V =  π ÷ 4 * L[cDl² + (1- c)Dt²]

where:
V = the log volume in cubic metres
L = length of the log in metres
c = constant
Dt = small end diameter taken 10 cm from end of log
Dl = large end diameter taken 10 cm from end of log/ taken 50 cm from the end of a butt log