Estonians use this formula developed by Arthur Nilson to calculate the volume of logs. This method uses both a formula and a support table with coefficients, depending on the tree type.
cbm = (d² * L*(a1+a2*L)+a3*L²)/10 000
d – small-end diameter
L – length in dm
a1, a2, a3 – coefficients, that are defined by the tree species
|Birch and other hardwoods||0.0783||0.000236||0.045|