⚙️ Engineering calculators

Flow, pressure, level, temperature and instrumentation. 20 calculators.

• 4–20 mA Scaling CalculatorConvert a 4–20 mA loop current to a process value (and back) for any measuring range — with live scaling chart.
• Cable Voltage Drop CalculatorCalculate voltage drop in copper or aluminium cable for single-phase and three-phase circuits — and the minimum cable size.
• Control Valve Kv / Cv CalculatorSize control valves for liquids — calculate Kv, Cv, flow or pressure drop from any three values.
• DP Flow Square Root CalculatorConvert differential pressure to flow for orifice, venturi and other DP flow meters using square-root extraction.
• Flow Meter K-Factor CalculatorConvert pulse frequency to flow rate (and back) for turbine, positive displacement and other pulse-output flow meters.
• Heat Duty Calculator (Q = ṁ·cp·ΔT)Calculate heating or cooling power from mass flow, specific heat and temperature difference — for heat exchangers, chillers and boilers.
• Horizontal Tank Volume CalculatorCalculate liquid volume in a partially filled horizontal cylindrical tank from its level — and the level for a given volume.
• Hydraulic Cylinder Force CalculatorCalculate push and pull force of a hydraulic cylinder from pressure, bore and rod diameter — or the pressure for a required force.
• Hydrostatic Pressure & Tank Level CalculatorConvert liquid level to hydrostatic pressure and pressure to level for any liquid density — ideal for level transmitter ranging.
• Mass Flow Rate CalculatorConvert volumetric flow to mass flow and back using fluid density — kg/h, t/h, lb/h, m³/h, L/min and more.
• Orifice Plate Flow CalculatorCalculate liquid flow through an orifice plate from differential pressure, bore, pipe size and density — or the DP for a given flow.
• Pipe Flow Velocity CalculatorCalculate fluid velocity in a pipe from flow rate and inner diameter — or the flow rate and pipe size for a target velocity.
• Pipe Pressure Drop Calculator (Darcy–Weisbach)Calculate friction head loss and pressure drop in a pipe from length, diameter, velocity and friction factor.
• Pitot Tube Velocity CalculatorCalculate air or liquid velocity from pitot tube differential pressure — and the flow in a duct or pipe.
• Pt100 / Pt1000 Resistance CalculatorConvert RTD temperature to resistance and resistance to temperature for Pt100, Pt500 and Pt1000 sensors (IEC 60751, 0–850 °C).
• Pump Power CalculatorCalculate hydraulic power and shaft power of a pump from flow rate, head, fluid density and efficiency.
• Reynolds Number CalculatorCalculate the Reynolds number of pipe flow and see whether it is laminar, transitional or turbulent.
• Thermal Expansion CalculatorCalculate how much a pipe, rail or bar expands with temperature for steel, stainless steel, aluminium, copper and PVC.
• Three-Phase Motor Power & Current CalculatorCalculate input power, output power and full-load current of a three-phase motor from voltage, power factor and efficiency.
• Torque, Power & Speed CalculatorConvert between shaft power, torque and rotational speed (rpm) for motors, gearboxes and engines.