AWC Span Calc determines joist and rafter spans for common loading conditions.
About AWC Span Calc
AWC Span Calc is a business app developed by American Wood Council.
How many times has AWC Span Calc been downloaded?
AWC Span Calc has been downloaded 36 thousand times. In the last 30 days, the app was downloaded 37 times.
What is the rating of AWC Span Calc?
AWC Span Calc is rated 2.98 out of 5 stars, based on 83 ratings.
Is AWC Span Calc free?
AWC Span Calc is free to download. The APK download size is 125.47 MB. The latest version available is 2.16.8. The last update was on September 29, 2025.
What are the requirements for AWC Span Calc?
AWC Span Calc requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play May 2012.
Description
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 2012 National Design Specification® (NDS®) for Wood Construction Supplement: Design Values for Wood Construction with March 2012 and March 2013 Addenda. 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.
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.
Recent changes: FIX : Application error when selecting short penny weight nails
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Great application for determining rafters and floor joists
★★★★★Jess· Jan 9, 2019
Best of its kind, and FREE! Only one suggestion: could you add smaller dimensional lumber for indoor/small projects (e.g. raised floor)? Looking everywhere for info using 2x3s/2x4s to frame 5'x7' raised bedroom floor. Thanks much.
★★★★★A Google User· Nov 29, 2012
AWC span calc Simple to use, no engineering require excellent would love this to do headers and girders
★☆☆☆☆Craftsman MtnMan· Jun 24, 2020
Used to work great then they updated and now It's extremely laggy or freezes completely. Absolutely unusable.
★☆☆☆☆Bill Yarbrough· May 26, 2020
I used to love this app when I purchased it but, now it freezes every time I try to use it my Galaxy S10.
★☆☆☆☆Emmanuel Garcia· May 14, 2020
It freezes upon selecting wood species. Using Samsung Note 9 and latest OS version.
★☆☆☆☆Aris Yiangopoulos· Mar 13, 2020
Terrible version extremely slow. Previous version was working fine on android. I feel handicapped now.
Google Play Rankings for AWC Span Calc
This app is not ranked
Technologies used by AWC Span Calc
AWC Span Calc is requesting 7 permissions and is using 7 libraries.
Permissions
Development tools
test access to protected storage
Network communication
view network connections,
full network access,
Google Play license check
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
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