Registration Information

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Registration Fee: $20*
*Once registered, a confirmation letter with a link to the course will be e-mailed to you. From that time you will have 30 days to complete the training.

Cancellation Policy

Online trainings are nonrefundable.

Training Information

Estimating Timber Volume More Efficiently

In this training, participants will learn techniques that can shorten the total time it takes to complete a timber volume or weight inventory of a forested stand.

Upon completion of this course, participants will be able to apply the principles learned in training to determine the total number of sampling point locations needed within a given forest inventory, and correctly calculate timber volume or weight estimates from a sampling-based inventory.

Learning Objectives:

1. Participants will learn and be able to define the various components and related terminology for a sampling-based inventory

2. Participants will calculate the number of sampling point locations needed for a given forest inventory

3. Participants will calculate the correct prism factors to use for the two types of sampling points used within a sampling-based inventory and determine the appropriate point location grid system to use.

4. Participants will calculate timber volume or weight estimates from a sampling-based inventory

5. Participants will calculate statistical confidence intervals for timber volume or weight estimates from a sampling-based inventory


This training is preapproved for 2 CEHs by the WI-DNR and 1 CFE by Society of American Foresters.

To obtain credit you will need complete the training within 30 days of registering and receive a 75% or higher on all assessments. A list of individuals who successfully complete the training will be submitted to WI-DNR and SAF on the first of each month.

Any questions regarding credit can be directed to Haley Frater at

Target Audience

This online training is designed for professional foresters. It does require a basic understanding of statistics as well as access to Excel.

Instructor Bio

As a professor of forest measurements, Paul Doruska teaches undergraduate and graduate courses in forest measurements, forest biometry, forest management and finance, forest products, natural resources communication and experimental design, in addition to teaching portions of the Introduction to Fisheries, Forestry, and Wildlife and People, Resources and the Biosphere classes in the core curriculum & co-teaching the pulpcut/chainsaw safety course.

Paul maintains an active interest in research and professional service. His past research work has focused on stand density index based management, weight scaling of timber, and developing equations to allow foresters to inventory timber by weight. With respect to professional service, Paul remains active in the Society of American Foresters. He currently is the chair of the National Committee on Accreditation and in the past has served as the North/Northeastern Regional Science Representative to the Forest Science & Technology Board, the Science and Technology Chair for the Wisconsin State Society of American Foresters, and as an associate editor for the Journal of Forestry.