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9.11 Log and Product Conversion Factors

Authors: JC Ellis
Publication: NZIF Forestry Handbook, Volume Section 9 – Utilisation of forest products, pp 11, Dec 2023
Publisher: New Zealand Institute of Forestry
Abstract: Exported logs are measured using the buyer¹s scaling system. In New Zealand, most of our exported logs are measured using the JAS (Japanese Agricultural Standard) system based on small-end diameter and a nominal length (see Section 5.1.2). This results in a difference between NZ cubic metres (NZCBM) and JAS cubic metres, because of its volume formulae, small-end diameter conventions and log taper assumptions.
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