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Horsepower to Amps Calculator — DC, 1-Phase & 3-Phase

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Electrical system Motor output (HP) Voltage (V) Efficiency (%) Enter nameplate/manufacturer efficiency when known.Power factor Used for AC modes; ignored for DC.

Calculated result

4.239841 A

Motor output: 746 W

Estimated input power: 828.89 W

Efficiency: 90%

Power factor: 0.85

Show the working

1. Output watts = 1 HP × 746 = 746 W.
2. Input watts = 746 ÷ 0.9 = 828.89 W.
3. 1-phase: I = input W ÷ (V × PF) = 4.239841 A.

This is a running-current estimate from the entered efficiency and power factor. Use nameplate/manufacturer or applicable code data for equipment and conductor sizing.

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