Beam Calc

Nabil's Lab

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About this app

Beam Calc is a fast, modern beam analysis app for structural/civil engineers and students. Build your beam with supports, loads, and internal hinges, then instantly view Shear Force (SFD), Bending Moment (BMD), Rotation (θ), and Deflection (v) diagrams—plus influence lines for key quantities.

What you can do:

Model supports and hinges
Pin, Roller, Fixed supports
Internal hinges (moment release) with correct discontinuities
Apply realistic loads
Point loads, Uniformly Distributed Loads (UDL), Concentrated Moments
Metric (kN, m, mm) and FPS (kip, ft, in) unit systems
Analyze any beam configuration
Determinate solver: matrix/segmental method with automatic discontinuity points
Indeterminate solver: direct stiffness method (Euler–Bernoulli FE) with Hermite interpolation for θ and v, curvature-based M = EI·κ, and M = 0 enforced at hinges
Visualize with clarity
SFD, BMD, Rotation (slope), and Deflection diagrams
Perfect vertical jumps at load/hinge discontinuities
Critical points: automatic max/min detection and display
Interactive grid and touch tracer to read exact values at any position
Influence lines (IL)
Compute IL for reaction, shear, or moment at chosen locations
Determinacy-aware sampling for both determinate and indeterminate beams
Productivity features
Save and load beam configurations for quick reuse
Clean Material You interface with dynamic theming
Engineering details done right:

Consistent sign conventions, including clockwise-positive concentrated moments with correctly oriented BMD spikes
Accurate handling of hinges and fixed supports in both determinate and indeterminate analyses
Who it’s for:

Structural and civil engineers, educators, and students who need quick, reliable beam calculations and diagrams on the go.
Note: Results are intended for education and preliminary design. Always verify against project codes, standards, and professional judgment before final use.

What’s new

Minor bug fixes.