JAS Scale

The Japanese Agricultural Standard Scale was developed for measuring roundwood in the late 1940s and became popular in Eastern Asia, Oceania (including Australia) and Chile. Used by companies exporting timber to China and Japan.

Formula:

For logs less than 6m long:

V(m³) = (D²*L)/10000

Where:

D – Small-end diameter (cm), for less than 14 cm the diameter is rounded down and after 14 cm the diameter is rounded down to the nearest even integer.

L – Length (m)

For logs equal to or greater than 6m:

V(m³) = (D + [L’-4]/2)²*(L/10000)

Where:

D – Small-end diameter (cm), for less than 14 cm the diameter is rounded down and after 14 cm the diameter is rounded down to the nearest even integer.

L – Length (m)

L’ – Length in meters rounded down to the nearest whole number

For a little bit more information about the JAS scale, check out our blog post here.