Horsepower to Amps Calculator
Convert horsepower to amps for DC, AC single‑phase, and three‑phase motors. Enter motor power, voltage, efficiency and power factor for precise electrical calculations.
Step 1: Motor & Voltage
⚡ Conversion formula
DC: Amps = (HP × 746) / (V × η)
AC 1φ: Amps = (HP × 746) / (V × η × PF)
AC 3φ: Amps = (HP × 746) / (V × η × PF × √3)
Step 2: Efficiency & Power Factor
💡 Typical values
Efficiency: 0.8–0.95 · Power factor (AC motors): 0.8–0.92. DC motors have no reactive power (PF=1).
Motor Current & Power Results
Full‑load current (Amps)
Current at common voltage levels
| Voltage (V) | Motor type | Current (A) | kVA |
|---|
Horsepower to Amps formulas
DC motor
\( I = \frac{HP \times 746}{V \times \eta} \)
AC single‑phase
\( I = \frac{HP \times 746}{V \times \eta \times PF} \)
AC three‑phase
\( I = \frac{HP \times 746}{V \times \eta \times PF \times \sqrt{3}} \)
kW = HP × 0.746 · kVA (input) = (HP × 746) / (η × PF × 1000) [three‑phase includes √3 in current]
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