Logging
Chinese National Standard
People's Republic of China national standard GB4814-84
For logs small-end diameter 4-12cm and lengths less than 10.2m
Diameter Measured Inside Bark = DIB
For logs small-end diameter 14cm and greater and lengths between 2m and 10m:
Diameter Measured Inside Bark = DIB
For logs less than 2m and greater than 10.2m in length:
Diameter Measured Inside Bark = DIB
For logs 10.2m in length:
Diameter Measured Inside Bark = DIB
Cubic Volume Log Rule Calculators