Nilson formula
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.
Formula:
cbm = (d² * L*(a1+a2*L)+a3*L²)/10 000
Where:
d – small-end diameter
L – length in dm
a1, a2, a3 – coefficients, that are defined by the tree species
| Species | a1 | a2 | a3 |
|---|---|---|---|
| Pine | 0.0799 | 0.000146 | 0.0411 |
| Spruce | 0.07995 | 0.00016105 | 0.04948 |
| Birch and other hardwoods | 0.0783 | 0.000236 | 0.045 |
| other conifers | 0.0800 | 0.000154 | 0.0453 |
