Structural Engineering Calculators

Structural engineering calculators cover beam deflection and span, section properties (moment of inertia, section modulus), bolted and welded connections, column buckling, and code-based loads — the mechanics behind sizing a member, not just ordering material.

Beam Load Capacity CalculatorBeam Span CalculatorBending Stress CalculatorBolt Circle CalculatorBolt Shear CalculatorBolt Torque CalculatorBolt Weight CalculatorColumn Buckling CalculatorDead Load CalculatorFederal Bridge Formula CalculatorFloor Load CalculatorGlass Weight CalculatorHoop Stress CalculatorMoment of Inertia CalculatorOccupancy Load CalculatorPolar Moment of Inertia CalculatorShear Stress CalculatorSteel Weight CalculatorStress CalculatorVon Mises Stress CalculatorWeld Strength CalculatorWind Load Calculator

Frequently asked questions

Are these calculators a substitute for a structural engineer?

No. They apply standard, published mechanics formulas — the same equations in any statics or mechanics-of-materials textbook — so you can check a number or understand a concept. Anything load-bearing or safety-critical (an actual beam, connection, or foundation) needs a licensed structural engineer's sign-off, not a website calculator.

Why do some calculators ask for E and I instead of just a beam size?

Modulus of elasticity (E) and moment of inertia (I) are properties of a beam's material and cross-section, not something a formula can guess. Real span/size tables come from code bodies (AWC, AISC) testing specific products — we don't have a verified copy of those tables, so we ask for the engineering properties directly and compute from first principles instead of publishing a possibly-wrong lookup value.

What is deflection-governed span?

Most codes cap how much a beam is allowed to sag under load — often span ÷ 360 for a floor. Our span calculators solve the deflection formula backward to find the longest span that stays under that limit. The actual code-approved span can be shorter if the beam's bending strength (not just stiffness) governs — always confirm with a span table or engineer before building.