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

Measuring log volume using top (small) end diameter measurement. Top measurement may be used on all tree species, regardless of diameter and length.

The top diameter is measured 10 cm from the top end of the log.
All diameter measurements are measured under the bark.

Formula used:

V = π ÷ 4 * L * Dt²

where:
V = the log volume in cubic metres
L = length of the log in metres
Dt = the small end diameter measured 10 cm from the top end of the log