AWC SpanCalc

American Wood Council

About this app

The American Wood Council (AWC) Span Calculator for Wood Joists and Rafters (Span Calc) performs calculations for all species and grades of commercially available softwood and hardwood lumber as found in the 2018 National Design Specification® (NDS®) for Wood Construction Supplement: Design Values for Wood Construction. 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.

Supported by the Softwood Lumber Board.



Maximum horizontal spans for joists and rafters are calculated based on the following assumptions and conditions:

· Joists and rafters are oriented to support vertical loads applied to the narrow (1.5 in. thick) face of the member, resulting in strong-axis bending.
· At least three joists or rafters are installed parallel to one another and spaced not more than 24 inches on-center, with properly designed sheathing attached on the top (compression) edge of each joist or rafter.
· Joists and rafters are single-span with adequate structural support at each end. The Span Calculator does not address cantilevered joists and rafters, multiple-span joists and rafters, or spliced joists and rafters.
· For joists and rafters, most building codes specify a minimum bearing length of 1.5 inches on wood or metal and not less than 3 inches on masonry or concrete. These minimum bearing lengths are to be used in the absence of calculated bearing lengths. Consult the local building code for specific requirements.
· Joists and rafters carry only combinations of dead load plus live load (D + L), dead load plus snow load (D + S), or dead load plus roof live load (D + Lr). The Span Calculator does not address wind load or seismic load.
· Buildings in regions with ground snow loads greater than 70 psf should not use the prescriptive provisions of the governing building code without approval of the authority having jurisdiction. Buildings in these high snow zones should be designed in accordance with accepted engineering practice.

While every effort has been made to insure the accuracy of the information presented, and special effort has been made to assure that the information reflects the state-of-the-art, neither the American Wood Council nor its members assume any responsibility for any particular design prepared from this Span Calculator application. Those using this Span Calculator assume all liability from its use.

Supported by the Softwood Lumber Board.

Ratings and reviews

Absolutely terrible. Every time you go to do a calculation app itself shut itself down you have to reload it and attempt to calculate again. And buy the 20th time you may be successful and get a calculation. I've tried uninstalling and reinstalling, no improvement. I tried updating my phone or even rolling it back to a previous update, no improvement. Absolutely trash and a waste of space on your phone.

I like the app, but it is only accounting for a very limited selection of woods, and only accounting for kiln dried dimensional lumber. This but useful for my needs. I would love to see it connected to the wood database for information on more wood varieties, as well as being able to account for custom sizes of rafters and beams for things like post and beam construction instead of only being used for stick frame buildings. Add those features and it will be a 5 star program!

Working great with Pixel 6a. Thanks for the fix!

What's new

FIXED : Multiple select popups not appearing