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American Wood Council
Maximum Span Calculator for Wood Joists and Rafters

Span Calculator

(Web-based version)
Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 20​12 Supplement. Joists and rafter spans for common loading conditions can be determined. A "span options" calculator allows selection of multiple species and grades for comparison purposes.
Connection Calculator

Connection Calculator

(Web-based version)
Provides users with a web-based approach to calculating capacities for single bolts, nails, lag screws and wood screws per the 20​05 NDS. Both lateral (single and double shear) and withdrawal capacities can be determined. Wood-to-wood, wood-to-concrete, and wood-to-steel connections are possible.
Energy UA Calculator

Energy UA Calculator

(Web-based version*)

* Not Google Chrome Compatible
Calculates an opaque wall or fenestration U-factor based upon the Total UA alternative compliance method permitted by the International Code Council’s 2012 International Energy Conservation Code (IECC) or International Residential Code (IRC). This new Energy UA Calculator is consistent with AWC’s Design for Code Acceptance 7, “Meeting Residential Energy Requirements with Wood-Frame Construction.” For use with the 2012 IECC or IRC, the AWC Energy UA Calculator app also gives insulation requirements needed in various wood wall assemblies to achieve the specified opaque wall U-factor. Wall assembly configurations calculated by the app include 2x4 and 2x6 wood framing at 16” and 24” on-center spacing as well as several cladding and sheathing options.
Heights & Areas Calculator

Heights & Areas Calculator

(Web-based version)
Provides users with a web-based approach to calculating maximum heights and areas for buildings of various occupancies and fire protection based on 2006 IBC provisions. Input a given building, and allowable construction types are determined. Calculator limits building input to a single occupancy for the entire building. For multi-story buildings, maximum single floor area can be any size up to total building floor area. Help File for understanding calculator background calculations and terms, with worked examples, is available.
Learn more about IBC height and area provisions and see a demo of the Heights & Areas Calculator in a free webinar titled Fire Protection I: Allowable Heights and Areas.
Carbon Calculator
Wood products continue to store carbon absorbed by the trees during their growth cycle, keeping it out of the atmosphere indefinitely. Using wood in place of fossil fuel-intensive materials also "avoids" greenhouse gases that would have been emitted during manufacturing. Now, it is possible to quantify these benefits for wood buildings.
WoodWorks® Design Office Software
WoodWorks Design Office software, the complete electronic tool for the wood building designer, conforming to the NDS 2012, IBC 2012, ASCE 7-10, and SDPWS 2008. Design modules include:
  • beam and column sizing
  • shear wall design
  • connection design
American Wood Council
222 Catoctin Circle SE, Suite 201
Leesburg, VA 20175

- Public Policy Office -
1101 K Street NW, Suite 700
Washington, DC 20005
- Phone -
General: 202-463-2766
General Fax: 703-771-4079
Publications: 800-890-7732
Publications Fax: 412-741-0609
- Email -
Technical: info@awc.org
Publications: publications@awc.org
Education: education@awc.org
Fire: fire@awc.org
© Copyright 2017 American Wood Council. All Rights Reserved.