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Both calculators run independently — change the inputs on either side to compare results.

Motor Full Load Current Calculator

Calculate the full load current (FLA) drawn by a single-phase or three-phase AC motor from its horsepower, voltage, efficiency, and power factor. Used for selecting fuses, breakers, wire gauges, and motor starters.

Motor Horsepower (HP)

Motor Voltage

Motor Efficiency (%)

Power Factor

Number of Phases

Fill in the required fields to see your result.

Electrical

Short Circuit Current Calculator

Calculate the available short-circuit fault current at any point in a three-phase electrical system, accounting for transformer impedance and cable length. Use this for sizing breakers, fuses, and switchgear to meet NEC and ANSI interrupt ratings.

System Voltage

Transformer KVA (kVA)

Transformer Impedance (%)

Cable Length to Fault (ft)

Fill in the required fields to see your result.

Key differences

	Motor Full Load Current Calculator	Short Circuit Current Calculator
Category	Electrical	Electrical
Inputs required	5	4
Result	Full Load Current (A)	Short Circuit Current (A)
What it does	Calculate the full load current (FLA) drawn by a single-phase or three-phase AC motor from its horsepower, voltage, efficiency, and power factor. Used for selecting fuses, breakers, wire gauges, and motor starters.	Calculate the available short-circuit fault current at any point in a three-phase electrical system, accounting for transformer impedance and cable length. Use this for sizing breakers, fuses, and switchgear to meet NEC and ANSI interrupt ratings.