Engineering Tools
Browse focused calculators and teaching utilities for civil engineering review, grouped by subject area.
School Automation
Exam preparation and classroom tools
Quiz Maker for Educators
Author new problem sets with sections, variables, images, formulas, and editable answer choices.
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Offline
Scanner
Scan generated OMR answer sheets with the native camera or imported photos. Detection, review, and scoring work fully offline.
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Structural Theory
Beams, trusses, and frames
Beam Calculator
Calculate reactions for prismatic or non-prismatic beams and draw shear, moment, slope, and deflection diagrams automatically.
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Truss Solver
Solve the reactions, member forces, and joint displacements of truss members.
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3D Equilibrium Solver
Model 3D joints, two-force members, loads, and ball-and-socket or roller supports in a rotatable space diagram.
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Frame Solver
Solve planar frame reactions, member forces, joint displacements, and axial, shear, and moment diagrams.
Open ApplicationReinforced Concrete
Singly reinforced beam tools
Singly Reinforced Beam Designer
Design a singly reinforced rectangular beam, compute required bars, check spacing, and show the reinforcement layout.
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Singly Reinforced Beam Analysis
Analyze an existing singly reinforced beam and compute the neutral axis, steel stress, nominal moment, and ultimate moment.
Open ApplicationStatics of Rigid Bodies
Force and moment visualization
Moment Visualizer
Visualize moments, lines of action, and concurrent force resultants on a scaled Cartesian plane.
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Resultant Force Solver
Add loads by magnitude and angle, Fx/Fy components, or a slope triangle (any two sides), and see scaled arrows, the resultant, and its line of action.
Open ApplicationSurveying
Leveling, curves, and earthworks
Differential Leveling Calculator
Compute height of instrument, elevations, arithmetic checks, and step-by-step differential leveling solutions.
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Earthworks Cross-Section Visualizer
Prepare Station A and Station B coordinate inputs, compute cut areas, and inspect the prismoidal earthwork model in 3D.
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Simple Curve Solver
Input R1, intersection angle I, and one known PC, PI, or PT station to compute the remaining stationing and simple curve elements.
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Compound Curve Solver
Input R1, R2, I1, I2, and one known station to compute common tangent, common chord, PCC, PI, and PT stationing.
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Reverse Curve Illustration
Draw a reverse curve with R1, R2, I1, I2, and an optional intermediate tangent between the opposite arcs.
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Symmetrical Vertical Curve Solver
Input back and forward grades, curve length, and a known PVC, PVI, or PVT to compute and draw a vertical curve.
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Unsymmetrical Parabolic Curve Solver
Set the PVI location with x = L1, compute L2, g3, H, and illustrate the unsymmetrical parabolic curve.
Open ApplicationEarthquake
Structural dynamics and seismic intuition
Resonance
Shake a base slow, medium, or fast — or drag it by hand — and watch which of the short, medium, and tall columns resonates when the shaking matches its natural frequency.
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