Span Calc vs Woodworker's Toolbox

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.

Stop doing shop math in your head. Woodworker's Toolbox is a complete set of workshop calculators built for real woodworkers — fraction math, board feet, drill bits, Janka hardness, and more. Large buttons, one-handed operation, no account required. CALCULATORS • Fraction Calculator — add, subtract, multiply and divide fractions without converting to decimals. • Board Feet Estimator — calculate board feet and lumber cost by the piece or by the project. • Pocket Hole Guide — select material type, enter thickness, get the right screw length and thread type every time. • Wood Movement — predict shrinkage and expansion based on species, cut, and moisture change. REFERENCE • Wood Species Database — 280+ species with Janka hardness ratings. Know how hard a wood is before you buy it. • Drill Bit Selector — enter your screw size, get the right bit rounded up to the nearest standard size. • Pilot Hole Chart — quick reference for pilot holes, clearance holes, and countersinks by screw size. • Drill Index — complete reference organized by fractional, numbered, lettered, and metric sizes. • Imperial ↔ Metric Converter — no mental gymnastics. DESIGNED FOR THE SHOP Dark mode. Works offline. No ads, no subscription, no account.