Electricity Calculator Group

Electric Motors Calculators

Estimate motor current, speed, slip, torque, starting demand, loading, and drive behavior.

Choose the electrical result you need

Motor nameplate data, duty, enclosure, starting method, load profile, and thermal limits govern final selection.

Open the calculator whose primary output matches the decision at hand. Each worksheet shows its formula, loaded example, input definitions, limitations, and related calculations.

Electric Motors worksheets

Motor Power CurrentCalculate motor current for a defined electrical case.Horsepower KilowattCalculate mechanical power for a defined electrical case.Three-Phase Motor CurrentCalculate line current for a defined electrical case.Motor Starting CurrentCalculate starting current for a defined electrical case.Locked-Rotor kVACalculate locked-rotor kVA for a defined electrical case.Motor EfficiencyCalculate motor efficiency for a defined electrical case.Motor TorqueCalculate shaft torque for a defined electrical case.Synchronous Motor SpeedCalculate synchronous speed for a defined electrical case.Motor SlipCalculate motor slip for a defined electrical case.Motor Poles FrequencyCalculate required pole count for a defined electrical case.VFD Motor SpeedCalculate estimated motor speed for a defined electrical case.VFD Energy SavingsCalculate estimated power after speed reduction for a defined electrical case.Motor CapacitorCalculate capacitive reactance target for a defined electrical case.Motor Overload SettingCalculate overload current setting for a defined electrical case.Motor Cable Power LossCalculate cable loss for a defined electrical case.Motor Service FactorCalculate permitted service-factor load for a defined electrical case.Motor Starting kVACalculate starting demand for a defined electrical case.Motor Energy ConsumptionCalculate motor energy for a defined electrical case.Motor Power FactorCalculate motor power factor for a defined electrical case.Motor Acceleration TimeCalculate acceleration time for a defined electrical case.

Use ratings and measurements deliberately

Keep voltage type, current path, frequency, phase arrangement, operating time, and temperature with the result. A value taken from a nameplate may describe a different condition from a meter reading.

These calculators support arithmetic and comparison. They do not replace electrical codes, equipment instructions, qualified design, safe isolation, or test procedures.