Beam sizing, load, and deflection calculators. Browse our free structural tools below — all calculators are instant, accurate, and require no sign-up.
Beam Size Calculator — Estimate the required beam size for residential construction based on span, load, and wood species. A quick reference, not a replacement for engineering.
Beam Span Calculator — Calculate the maximum allowable span for a wood beam based on size, species, and loading. Quick reference for residential beam spans.
Dead & Live Load Calculator — Calculate combined dead and live loads for floors and roofs. Quickly sum material weights and code-required live loads for structural design.
Deflection Limit Calculator — Calculate the allowable and actual beam deflection based on span and stiffness. Check L/360, L/240, and other deflection criteria.
Distributed Load Calculator — Calculate reactions, maximum moment, shear, and deflection for a uniformly distributed load on a simple beam. Essential for joist and beam design.
Floor Joist Span Calculator — Find maximum floor joist span by species, grade, size, and spacing. Uses IRC residential span tables for live and dead loads.
Glulam Beam Sizing Calculator — Size a glulam beam for span and load. Compare standard glulam depths and widths to find the right beam for your project.
I-Joist Selection Calculator — Select the right I-joist depth and series for your floor span and spacing. Compare TJI and other I-joist products by span capability.
Lag Bolt Capacity Calculator — Estimate the shear and withdrawal capacity of lag screws in wood based on bolt diameter, embedment, and wood species.
Load-Bearing Wall Calculator — Determine the load on a bearing wall from floor, roof, and live loads using tributary widths. Helps with header and footing design.
LVL Beam Span Calculator — Find the maximum span for Laminated Veneer Lumber (LVL) beams by depth, number of plies, and load. Quick LVL sizing reference.
Moment of Inertia Calculator — Calculate the moment of inertia (I) and section modulus (S) for rectangular and multi-ply wood beam cross-sections.
Point Load Calculator — Calculate beam reactions, maximum moment, and deflection from a single point load at any position along a simple beam span.
Post Size Calculator — Estimate the minimum wood post size based on axial load and unbraced height. Uses column slenderness ratio and NDS guidelines.
Section Modulus Calculator — Calculate the required section modulus for a beam from the maximum bending moment and allowable stress. Find the minimum beam size.
Simpson Tie Selection Calculator — Find the right Simpson Strong-Tie connector for your framing connection. Look up hurricane clips, joist hangers, post bases, and straps.
Tributary Area Calculator — Calculate the tributary area for beams, columns, and footings. Convert tributary area to total load for structural design.