EngineeringFormulaSolved Engineering Calculation Examples
Popular engineering calculations broken down into formulas, substitutions, unit conversions, and solved steps. More examples are planned around high-intent calculator searches.
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How to Calculate Concrete Volume
Use length × width × thickness for rectangular pours, convert inches to feet, then add a practical overage before buying bags or ready-mix.
Civil & Structural
How to Calculate Voltage Drop
Calculate conductor voltage loss from current, one-way run length, material resistivity, wire area, and circuit type.
Electrical
How to Calculate Beam Deflection
Calculate maximum beam deflection from load, span, material stiffness, moment of inertia, and the matching support/load case.
Civil & Structural
How to Calculate Wire Size
Size an AWG conductor by checking ampacity first, then upsizing if a long run fails the voltage-drop limit.
Electrical
How to Calculate Ohm's Law
Use V = I × R to solve voltage, current, or resistance when any two values are known in a simple resistive circuit.
Electrical
How to Calculate Force
Use Newton's second law to calculate net force from mass and acceleration, then check direction with a one-dimensional sign convention.
Engineering Mechanics
How to Calculate Reynolds Number
Calculate Re = ρvD/μ from fluid density, velocity, pipe diameter, and dynamic viscosity, then read the flow regime - laminar, transitional, or turbulent.
Fluid Mechanics
How to Calculate Pipe Size
Use Q = A × v and d = √(4Q / πv) to find the minimum inside diameter for a target flow rate and velocity, then pick the nearest standard nominal pipe size.
Fluid Mechanics
How to Calculate Torque
Multiply the applied force by the perpendicular distance from the pivot to get torque: T = F × r. Then match the result to a real-world decision - bolt spec, motor rating, or shaft design.
Engineering Mechanics
How to Calculate HVAC Load
Estimate heating and cooling load by adding envelope conduction, infiltration, solar gain, internal gains, latent load, duct allowance, and sizing margin.
Thermodynamics
How to Calculate Circuit Breaker Size
Add non-continuous load at 100%, continuous load at 125%, then round up to the next standard breaker size while checking conductor ampacity separately.
Electrical
How to Calculate Rebar Weight
Calculate reinforcing bar weight from nominal kg/m or lb/ft, bar length, quantity or spacing layout, and waste allowance.
Civil & Structural