7 calculators in this category
- Three-Phase Power CalculatorBalanced three-phase AC power relations (IEEE Std 1459)Give this calculator the line-to-line voltage, the power factor, and any one of line current, kilowatts or kilovolt-amperes…
- Transformer kVA Sizing CalculatorNEC Article 450 · ANSI/IEEE C57.12 rating seriesTell this calculator what your load is — in kVA, in kilowatts with a power factor, or as measured amps at the secondary voltage…
- Motor Full Load Amps (FLA) CalculatorNEC (NFPA 70) Article 430Enter a motor’s horsepower or kilowatt rating, its supply voltage, phase, efficiency and power factor, and this calculator…
- Motor Overload & Breaker Sizing Calculator (NEC 430)NEC 2023 (NFPA 70) Article 430Motor circuits are protected twice, by two devices with different jobs, sized from two different currents. This calculator does…
- Motor Efficiency CalculatorIEEE 112 efficiency definitions; NEMA MG 1 nameplate valuesTake volts, amps and power factor at the motor terminals, add the shaft power the machine is actually delivering, and this…
- Motor Torque Calculator (HP, kW and RPM)P = Tω, with NEMA MG 1 torque definitionsEnter a motor's rated power and shaft speed and this calculator returns the full-load torque in both pound-feet and…
- Power Factor Correction Capacitor CalculatorNEC 2023 Article 460; IEEE 18 shunt capacitor standardEnter the real power of a load, its present power factor and the power factor you want, and this calculator returns the…
Which one do you need?
- Three-Phase Power Calculator
- Convert between line current, voltage, kW, kVA and kVAR on a balanced three-phase system, and see the winding voltage and current for wye or delta.
- Transformer kVA Sizing Calculator
- Size a single- or three-phase transformer from your connected load, pick the next standard kVA rating, and get primary and secondary full-load currents.
- Motor Full Load Amps (FLA) Calculator
- Convert motor horsepower or kW to full-load amps using voltage, efficiency and power factor, then compare it with the NEC Table 430.250 value you size from.
- Motor Overload & Breaker Sizing Calculator (NEC 430)
- Size motor branch-circuit conductors, overload relay settings and the maximum breaker or fuse for a single motor under NEC Article 430, with the disconnect rating.
- Motor Efficiency Calculator
- Work out an electric motor's measured efficiency, load percentage and losses from volts, amps, power factor and shaft output, with annual energy and cost.
- Motor Torque Calculator (HP, kW and RPM)
- Convert motor horsepower or kilowatts and shaft speed into torque in pound-feet and newton-meters, and convert a measured torque back into power.
- Power Factor Correction Capacitor Calculator
- Find the kVAR of capacitance needed to raise a load's power factor to a target value, with the microfarads per phase and the resulting current reduction.
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