Motor Power & Current Calculator
Calculate motor Full Load Amperes (FLA), inrush starting current, and recommended circuit breaker, overload relay, and copper cable cross-section for 3-phase or 1-phase AC motors.
Induction motors typically 0.80–0.89
IE2/IE3 high-efficiency motors ~85%–94%
Direct-on-Line (DOL) is approx. 5–7x
Results & Sizing
| Rated Power (kW) | — kW |
| Full Load Current In | — A |
| Est. DOL Starting Current | — A |
| Rec. Circuit Breaker (Type D) | — A |
| Thermal Relay Setting Range | — A |
| Min Rec. Copper Cable Size | — mm² |
Formulas
3-Phase: In = P(W) / ( √3 × UL × cosφ × η )
Single Phase: In = P(W) / ( U × cosφ × η )
1 HP ≈ 0.7457 kW
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