Engineering calculators
41 free engineering tools, each with the formula and step-by-step working.
- Air Changes Per Hour CalculatorVentilation rate for a room.
- Battery Runtime CalculatorEstimated runtime from battery capacity and load current.
- Beam Load CalculatorBending moment and deflection for a beam.
- Belt Length CalculatorV-belt length between two pulleys.
- Capacitor Charge CalculatorStored charge and energy in a capacitor.
- Column Buckling CalculatorEuler critical buckling load.
- Conduit Bending CalculatorOffset, saddle and stub-up bend marks.
- Duct Size CalculatorDuct diameter for a target airflow.
- Gear Ratio CalculatorRatio, output speed and torque.
- Gear Ratio CalculatorOutput speed and torque from gear tooth counts.
- Generator Sizing CalculatorMinimum generator size for a set of household or site loads.
- Heat Transfer CalculatorConduction heat loss through a wall.
- HVAC Load CalculatorCooling load in BTU and tons.
- Inductor Energy CalculatorEnergy stored in an inductor's magnetic field.
- Inverter Sizing CalculatorMinimum inverter rating for a set of AC loads.
- kWh Electricity Cost CalculatorRunning cost of an appliance from its wattage and usage.
- LED Resistor CalculatorSeries resistor for any LED.
- LED Resistor CalculatorCurrent-limiting resistor value for an LED circuit.
- Motor Efficiency CalculatorElectric motor efficiency from input and output power.
- Natural Gas Pipe Sizing CalculatorPipe diameter for BTU load and run length.
- Ohm's Law CalculatorVoltage, current, resistance and power from Ohm's law.
- Pipe Velocity CalculatorFlow velocity and pipe sizing.
- Power Factor Correction CalculatorCapacitor kVAr needed to fix power factor.
- Power Factor Correction CalculatorCapacitor size needed to correct a load's power factor.
- Pulley Mechanical Advantage CalculatorMechanical advantage and effort force for a pulley system.
- Pulley RPM CalculatorDriven pulley speed, ratio and belt length.
- Pump Flow Rate CalculatorFlow, head and hydraulic power.
- RC Time Constant CalculatorCharge time and cutoff frequency.
- Resistor Series/Parallel CalculatorTotal resistance for two resistors in series or parallel.
- Resistor Value CalculatorResistance from band values and tolerance.
- RPM to Speed CalculatorVehicle speed from engine RPM.
- Solar Panel Array Sizing CalculatorNumber of solar panels needed for a daily energy target.
- Sound Level CalculatorCombine decibels and distance loss.
- Thermal Expansion CalculatorLength change with temperature.
- Three Phase Power CalculatorkW, kVA and current for 3-phase loads.
- Three-Phase Power CalculatorReal power for a balanced three-phase electrical load.
- Transformer Turns Ratio CalculatorVoltage, current and turns for a transformer.
- Transformer Turns Ratio CalculatorSecondary voltage and current from a transformer's turns ratio.
- Voltage Divider CalculatorOutput voltage, current and power for a two-resistor divider.
- Wire Gauge Ampacity CalculatorSafe current rating for common copper wire gauges.
- Wire Voltage Drop CalculatorVoltage drop over a wire run by length and gauge.
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