Span Calc vs ChargeRight

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 2021 National Design Specification® (NDS®) 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.

Can your electrical panel support an EV charger? Find out in minutes with a real NEC load calculation -- no electrician visit needed. ChargeRight gives homeowners clear, code-based answers about their panel capacity before committing to expensive electrical work. Built by a Master Electrician, not a tech company or an installation broker. HOW IT WORKS 1. Photograph your panel -- open the door so the breakers are visible. 2. Answer questions about your home -- panel size, square footage, heating, and the appliances you already run. 3. Pick your EV -- the circuit is sized to the driving you actually do, not to the biggest charger an installer can sell you. 4. Get your report ($69.99) -- your load calculation, your panel's spare capacity, and what to tell your electrician. WHAT YOU GET • A real NEC load calculation, the same math a licensed electrician runs before quoting you • AI analysis of your panel photo for visible safety concerns • Your calculated load, your panel's safe capacity, and the headroom left over • A charger size matched to your driving • A word-for-word script for the call with your electrician • A shareable report link you can open from any browser WHY IT MATTERS J.D. Power found only 28% of EV owners needed panel-specific work, even though ESFI found 65% were told they did. A proper load calculation can save you $2,000-$4,500 by avoiding an upgrade you do not need. Don't accept "you need an upgrade" without seeing the math. BUILT BY AN ELECTRICIAN, FOR HOMEOWNERS ChargeRight was founded by Jason Walls, a Master Electrician with EVITP certification. There is no financial incentive to upsell you here. The only job is giving you accurate numbers. • Independent -- nothing is installed and no installation is brokered • Code-based -- calculations follow the National Electrical Code • Private -- your data is used only for your report $69.99 per assessment. One time, no subscription. This is a pre-assessment, not an official inspection or a permit. Have a licensed electrician confirm before any work.