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Amps Calculator
Convert watts to amps or horsepower to amps. Supports DC, AC single-phase, and AC three-phase.
Watts to Amps
Amps
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AC uses power factor of 0.85 (typical motor load).
Horsepower to Amps
Amps
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1 HP = 746 W. Efficiency assumed 90%.
How this was calculated
DC: I = P / V
AC 1-Phase: I = P / (V × PF)
AC 3-Phase: I = P / (√3 × V × PF)
HP to Watts: W = HP × 746 / Efficiency
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Amperage depends on power, voltage, and for AC circuits, the power factor and phase configuration. These calculations are essential for electrical system sizing, circuit breaker selection, and motor installations. Built by Groundwork Analytics.