Free · No sign-up · SI and US units
Engineering calculators that show their work.
Beam deflection, section properties, column buckling, derivatives and integrals. Every tool lists its formulas, assumptions and a worked example, so you can check the answer by hand.
Calculators
Structural & Mechanics Series S
- ECT-S01Simply Supported Beam CalculatorDeflection, bending moment, shear and reactions for a central point load or a full-span uniform load.
- ECT-S02Cantilever Beam CalculatorTip deflection, slope, fixed-end moment and reactions for an end point load or a uniform load.
- ECT-S03Moment of Inertia CalculatorArea, second moment of area, section modulus and radius of gyration for rectangles, tubes, circles and I-beams.
- ECT-S04Column Buckling CalculatorEuler critical load and stress, slenderness ratio and a Johnson check for short columns.
Calculus Series C
No calculator matches that search yet. Try a broader word such as “beam” or “integral”.
Method
How the calculators are built
Each tool solves one well-defined problem and tells you exactly which one.
Formulas on the page
Every calculator prints the equations it uses, the variables, and the assumptions behind them, followed by a worked example you can repeat by hand.
Checked independently
Results are tested against separate methods, such as numerically integrating M/EI for beam deflection, not just against the same formula typed twice.
Your units, both ways
Switch between SI and US customary at any time, or pick a unit per field. Unit menus remove the most common source of wrong answers.
Private and shareable
Calculations run in your browser. Nothing you type is uploaded, and “Copy link” saves your inputs in a URL you can send to a classmate or colleague.