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

Measuring log volume using mid-point diameter measurement
Mid-point measurement may be used on all tree species, regardless of diameter and length.
Diameter measurements are measured under the bark.

Formula used:

V = π ÷ 4 * L * Dm²

where:
V = the log volume in cubic metres
L = length of the log in metres
Dm = the mid-point diameter