Engineering Calculators
Last updated: September 2026
Pump Power & Efficiency Calculator
Find the shaft power (kW) needed to drive a pump given flow rate, head, fluid density, and combined pump-motor efficiency.
Pipe Flow Friction Loss Calculator
Calculates pressure drop due to friction in straight pipe runs using the Darcy-Weisbach equation.
Pump Head & Power Calculator
Calculates the brake horsepower a pump motor must deliver to move a fluid at a given flow rate against static head and pipe friction losses.
Pipe Flow & Pressure Drop Calculator
Calculates pressure drop along a pipe using the Hazen-Williams equation, accounting for pipe material, flow rate, diameter, length, and elevation change.
Gear Ratio & Torque Calculator
Compute the output torque, gear ratio, and mechanical advantage of a gear pair given tooth counts, input torque, and efficiency.
Power Transmission Calculator
Converts torque (N·m) and rotational speed (rpm) into mechanical power in kilowatts.
HVAC Duct Sizing Calculator
Calculate the required diameter or dimensions of HVAC ducts based on air flow rate and design velocity.
Steel Column Buckling Calculator
Computes the Euler critical buckling load for steel columns under axial compression.
Transformer Losses Calculator
Calculate the operating efficiency of a power transformer at any load factor, accounting for both iron (no-load) and copper (load-dependent) losses.
Electrical Wire Sizing Calculator
Determines the minimum wire cross-sectional area needed to keep voltage drop within safe limits for a given load current and run length.
Convective Heat Transfer Calculator
Calculate convective heat transfer rate from a solid surface to a flowing fluid (or vice versa) using Newton's law of cooling.
Stress and Strain Calculator
Converts an applied force and cross-sectional area into mechanical stress in MPa.
HVAC Heat Load Calculator
Estimates the heating or cooling load for a room or building in BTU/hr based on floor area, ceiling height, insulation quality, temperature difference, and window area.
Heat Conduction Calculator
Compute the steady-state heat flow rate through a flat material layer using Fourier's Law.
Pipe Flow Rate Calculator
Determine the flow rate of water through a pipe using the Hazen-Williams equation.
Concrete Mix Design Calculator
Estimate the total cement mass needed for a concrete batch based on target strength, volume, exposure conditions, and aggregate size.
Pump Power Calculator
Calculate the shaft power and motor input power needed to pump a fluid against a given head.
Thermal Stress & Expansion Calculator
Calculate how much a material expands or the thermal stress it develops when temperature changes, depending on whether it is free to move or constrained.
Beam Deflection Calculator
Compute the maximum mid-span deflection of a simply supported beam under a uniformly distributed load (UDL) using δ = 5wL⁴ / (384EI).
Ohm's Law & Power Calculator
Solve for voltage, current, resistance, or power in any DC circuit by entering just two known electrical values.
Soil Bearing Capacity Calculator
Estimate the ultimate bearing capacity of soil beneath a square footing using Terzaghi's general bearing-capacity equation.
Pipe Pressure Drop Calculator
Compute the friction term f·(L/D)·(v²/2) from the Darcy-Weisbach equation — the specific energy loss per unit mass of fluid flowing through a straight pipe.
Heat Exchanger Effectiveness Calculator
Calculate the actual heat transfer rate of a heat exchanger using the effectiveness-NTU method.
Column Buckling Calculator
Find the safe critical buckling load for a structural column using Euler's formula with a factor of safety.
Ohm's Law Calculator
Compute voltage across a component using Ohm’s Law, V = I·R, given the current flowing through it and its resistance.
Reynolds Number Calculator
Compute the Reynolds number to determine whether pipe or channel flow is laminar, transitional, or turbulent.
Gear Ratio & Speed Calculator
Calculates the output speed of a two-gear meshing pair given the driver and driven tooth counts and the input speed.
Thermal Expansion Calculator
Computes how much a solid expands in length, area, or volume when its temperature changes.
Pressure Vessel Wall Thickness Calculator
Determines the minimum wall thickness required for cylindrical or spherical pressure vessels under internal pressure.
Pump Head Calculator
Determine the total dynamic head and shaft power needed to move fluid through a piping system.