Category
Structural calculators
Beam deflection, loads, moments and serviceability checks for the daily decisions of architects, engineers and contractors. Material presets cover structural steel, aluminum, normal-weight concrete and dimensional softwood. Inputs accept imperial (lb, in, ksi) and metric (kN, mm, GPa) — a single toggle in the header converts everything in place.
All Structural calculators
Beam Deflection Calculator
Maximum deflection for simply-supported, cantilever or fixed-fixed beams.
Moment of Inertia Calculator
Area moment of inertia for 9 cross-sections — rectangles, circles, I-beams and W-shapes.
Steel Beam Calculator
Pick the right W-shape from load, span, grade and deflection limit (AISC).
Beam Load Calculator
Maximum allowable uniformly distributed load for any AISC W-shape and span.
Column Load Calculator
Axial capacity for steel (AISC Euler buckling) and concrete (ACI 318) columns.
Reading deflection results
Maximum deflection (δ) is reported in inches and millimetres alongside the span-to-deflection ratio L/δ. The ratio is what governs serviceability: a typical live-load limit is L/360 (i.e. δ ≤ L / 360), and a total-load limit is L/240. Our tools flag results green for L/δ ≥ 360, yellow for 240 – 360, and red below 240, with a clear caveat that this is a guideline — not a substitute for the actual load combinations and limits in the governing code (typically IBC and ASCE 7 in the U.S.).
Material modulus presets we use
- Structural steel:
E = 29,000 ksi (200 GPa) - Aluminum 6061:
E = 10,000 ksi (69 GPa) - Normal-weight concrete:
E ≈ 3,600 ksi (25 GPa) - Douglas Fir-Larch (No. 2):
E ≈ 1,700 ksi (12 GPa)
You can override any of these in the input. For pre-fabricated sections, our preset library covers common W-shapes (W8×10, W10×12, W12×16, W14×22), and lets you compute I from a rectangular section (b · h³ / 12) or a round solid (π · d⁴ / 64).
What these calculators don’t replace
A licensed structural engineer must review the final design. These tools are sized for fast checks and design exploration — they do not consider lateral-torsional buckling, shear deformation, connection design, second-order effects, or any load combinations beyond a single applied load.