Motors And Starters
Motor FLA, running current, starting current, horsepower, torque, overload, and starter sizing calculators.
Motors And Power Quality
Motor current, starter sizing, VFD checks, transformer kVA, generator load, harmonics, and power quality.
Subcategories
Motors, Starters And VFD
Motor current, torque, inertia, soft starter, bypass rating, VFD cable length, and drive load calculators.
Power Quality And Transformers
Transformer kVA, primary current, secondary current, impedance, inrush, K-factor, generator sizing, and UPS capacity.
Published Calculators
Transformer Current Calculator
Estimates transformer primary and secondary line current from kVA, primary and secondary voltage, and the selected phase model.
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Transformer Impedance Calculator
Converts transformer percent impedance to per-unit and ohmic values, then estimates transformer-limited current on the selected voltage and phase base.
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Power Factor Correction Calculator
Estimates required correction kVAR and apparent-current reduction from kW, current power factor, target power factor, voltage, and phase.
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NEMA Code Letter Calculator
Estimates kVA per horsepower and the matching NEMA-style code-letter range from horsepower, voltage, phase, and locked-rotor current.
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Motor Torque Calculator (hp or kW to lb-ft and N-m)
Convert motor horsepower or kilowatts and rpm into shaft torque in lb-ft and N-m.
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Motor Voltage Drop Calculator
Estimates running and starting voltage drop and remaining motor voltage from current, one-way length, conductor resistance, system voltage, and phase model.
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Motor Overload Calculator
Compares a motor overload setting from nameplate FLA and an entered percentage with a recorded device setting, with motor load shown in kVA.
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Motor Slip Calculator
Estimates induction-motor slip as a speed difference in rpm and as a percentage of synchronous speed from measured rotor speed.
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Motor Disconnect Size Calculator
Compares a motor disconnect current basis with an entered disconnect rating using motor FLA, multiplier, voltage, and phase.
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Motor Efficiency Calculator
Estimates ideal motor efficiency and power loss from electrical input power and mechanical output power.
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Locked Rotor Current Calculator
Estimates motor locked-rotor current from full-load current and a selected multiplier, with an optional comparison against a starting-current reference.
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Harmonic Distortion Calculator
Estimates THD and each listed harmonic as a percentage of the fundamental from entered fundamental and harmonic RMS values.
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Generator Size Calculator
Estimates planning running and surge ratings, plus an apparent-power basis, from running watts, starting loads, power factor, and margin.
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Capacitor Bank Size Calculator
Estimate required power-factor correction kVAR and capacitance per phase from real power, current and target power factor, system voltage, frequency, and capacitor connection.
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Buck-Boost Transformer Calculator
Estimate buck-boost winding and adjusted kVA from supply and target voltage, load current, phase arrangement, and a planning multiplier. Final transformer selection remains a manufacturer and installation review.
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Motor Starter Current Reference Calculator
Estimate starting current, overload reference current, and starter continuous-current discussion values from motor FLA and entered project assumptions.
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Motor Starting Current Calculator
Estimate motor starting current from full-load current and a selected starting multiplier, with a voltage-sag reference for preliminary review.
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Motor Power From Current Calculator
Estimate motor input power, output power, and horsepower from line current, voltage, phase model, power factor, and efficiency.
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Motor Current Calculator
Estimate motor running current from horsepower and operating assumptions for preliminary load, voltage-drop, and feeder review.
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Full-Load Current Estimate Calculator
Estimate motor full-load current from horsepower, voltage, phase count, efficiency, and power factor before verified nameplate or table review.
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Electrical Load Calculator
Estimate apparent power, real power, and reactive-power magnitude from line voltage, load current, phase model, power factor, and utilization.
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