Department of Agriculture, Forest Service, Pacific Northwest Research Station. Estimating load weights with Huber''s Cubic Volume formula: a field trial. Greater yarding productivity can be achieved when an accurate log weight estimation technique is combined with efficient load assembly and hooking operations.

Increased efficiency provided by accurate estimates of load weights was often negated during the assembly of loads and in the hooking operation. The number of aborts caused by inaccurate estimation of load weights was small (six). It is also possible to change the base of the logarithm using the. Log weight table and MBF conversion factors for mixed hardwoods. If there is an exponent in the argument of a logarithm, the exponent can be pulled out of the logarithm and multiplied. The load weights were accurate (about 10-percent error), and the method was easily applied under difficult logging conditions. EX: log (10 / 2) log (10) - log (2) 1 - 0.301 0.699. Accuracy of the estimated load weights was evaluated by comparing the predicted with the actual load weights as measured with scales in a helicopter. Tags showing estimated log weights were attached to logs in the field, and the weights were tallied into a single load weight as logs were assembled for aerial yarding. For instance, the length of the package is 24.25, round it up to 25.Log weights were estimated from the product of Huber's cubic volume formula and green density. Pro Tip: Make sure you always round up the results. board feet) conversion rate than longer logs for accurate calculation. So if you ship that box domestically via UPS, its dimensional weight equals 74 lbs (or 10,240 divided by 139). Growing site differences can influence log weight due to differences in the types. For FedEx and UPS, the retail dimensional weight divisor is 139 and both DHL and USPS use 166 as the dim factor for packages less than 1,728 cubic inches (or 1 cubic foot). Now multiply the three dimensions - 40 times 16 times 16 - which equals 10,240 cubic inches.ĭepending on the carrier, you’ll divide the total cubic inches by the dimensional weight divisor. Here’s an example: You have a box measuring 40 inches x 16 inches x 16 inches. This green log weight calculator is an essential tool for arborists that lets you easily calculate the green log weight by entering tree species, log width. Calculate the weight of a log using Hubers formula for the cubic feet volume of the log. Then multiply the results to obtain the cubic size of your package. To calculate dimensional weight, measure the length, width, and height of the box. (Parcel Height x Parcel Width x Parcel Length)/DIM Factor = DIM Weight* Determine the package dimensions, and divide by a DIM Factor:

Log weight calculator