Estimating BF yields

      Some formulas for calculating board foot yields from rough logs. March 1, 2000

Question
I am new to sawmilling and I would appreciate it if you could give me a formula for calculating board feet of usable boards from a specific size log, i.e. 18" x 10'. I understand that this might be different if sawn differently -- quartered or whatever.

Answer
There are probably over 100 log rules that estimate footage in logs. Most of them are empirical. However, a few are formula-based. Some have regression equations. For example, Scribner is V = (0.0494 x Dia x Dia x Length) - (0.124 x Dia x Length) - (0.269 x Length).

International is V = 0.905 x ([0.22 x Dia x Dia] - [0.71 x Dia]) for every four-foot length of log. There is also a longer equation for any length log.

Doyle is V = [L x (Dia - 4) x (Dia - 4)] / 16

Doyle is also V = [0.0625 x Dia x Dia x Length] - [0.500 x Dia x Length] + [1.000 x length]

In all cases, diameter is inside bark, small end. It is rounded to the closest inch. (Sometimes the scale includes the outside bark diameter.)

Length is the last full foot, no fractions.

Often the footage is rounded to the closest 10 BF. Then, since all the numbers are a multiple of 10, the "0" is dropped (e.g., 120 BF becomes 12) and the scale is called "decimal" which means you have to multiply by 10. But sometimes the decimal values do not drop to "10" and then you do not have to multiply by 10., etc.

Gene Wengert, forum moderator

For more info, see Log Volume



Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?


Have you reviewed the related Knowledge Base areas below?
  • KnowledgeBase: Primary Processing: Kiln Operation

  • KnowledgeBase: Primary Processing: Sawmilling

  • KnowledgeBase: Wood Engineering: General

  • KnowledgeBase: Woodworking Miscellaneous: Woodworking

  • KnowledgeBase: Knowledge Base


    Would you like to add information to this article? ... Click Here

    If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to
    review our Forum Guidelines.

    Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

    When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

    Return to beginning of article.



    Refer a Friend || Read This Important Information || Site Map || Privacy Policy || Site User Agreement

    Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page.

    Contact us to discuss advertising or to report problems with this site.

    To report a problem, send an e-mail to our Webmaster

    Copyright © 1996-2016 - WOODWEB ® Inc.
    All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor.
    Review WOODWEB's Copyright Policy.

    The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk.

    WOODWEB, Inc.
    335 Bedell Road
    Montrose, PA 18801

    Contact WOODWEB











  • WOODWEB - the leading resource for professional woodworkers


      Home » Knowledge Base » Knowledge Base Article