Example engineering calculations
Worked, unit-aware calculation worksheets across structural, mechanical, electrical and more. Open any example into your own workspace to edit and reuse.
315 examples
Truss Diagonal Member Force
Axial force in a truss diagonal carrying a panel shear.
Hollow I-Section Second Moment of Area
Second moment of area of a built-up or hollow rectangular (I-type) section.
Wind Pressure on a Surface
Dynamic wind pressure on a surface from the wind speed.
Roof Snow Load
Design snow load on a roof from the ground snow load and a shape coefficient.
Concrete Cylinder Compressive Stress
Compressive stress in a standard concrete test cylinder under load.
Rebar Tension Capacity
Yield tension capacity of reinforcing steel from its area and yield strength.
Shear Reinforcement Capacity
Shear carried by vertical stirrups in a reinforced-concrete beam.
Modular Ratio
Ratio of steel to concrete elastic moduli used in transformed-section analysis.
Belt Capstan (Friction) Tension
Tight-side tension of a belt or rope over a pulley using the capstan equation.
V-Belt Power Transmission
Power transmitted by a belt drive from its tension difference and speed.
Journal Bearing Pressure
Projected bearing pressure of a journal (plain) bearing.
Disc Brake Torque
Braking torque from a disc brake’s friction force and radius.
Torque to Angularly Accelerate
Torque required to angularly accelerate a rotating mass.
Centrifugal Force of a Rotating Mass
Outward centrifugal force on a mass rotating at angular speed.
Hydraulic Cylinder Force
Output force of a hydraulic cylinder from the supply pressure and bore.
Fatigue Endurance Limit (Estimate)
First-estimate endurance limit of a steel from its ultimate tensile strength.
Continuity: Velocity Change
Velocity after a change of pipe area from the continuity equation.
Hydraulic Radius of a Channel
Hydraulic radius of a flow cross-section from its area and wetted perimeter.
Froude Number
Froude number of an open-channel or marine flow.
Rectangular Weir Flow
Discharge over a sharp-crested rectangular weir.
Pump Affinity Law (Flow vs Speed)
New pump flow rate when its speed changes, via the affinity laws.
Pipe Friction Pressure Drop
Frictional pressure drop along a pipe from the Darcy–Weisbach equation.
Capillary Rise
Height a liquid rises in a fine tube by surface tension.
Stokes Drag on a Sphere
Viscous drag on a small sphere moving slowly through a fluid.