line current calculator
Convert power, phase current or voltage into line current for DC, single-phase and three-phase (wye/delta) systems. Includes formulas, examples, and FAQs.
three-phase line current; delta line current
Line current is the current in each supply conductor. For balanced 3-phase, \(I_L=P/(\sqrt{3}V_{LL}PF)\). In delta \(I_L=\sqrt{3}I_{phase}\); in wye \(I_L=I_{phase}\).
Formula & Table Summary:
DC / 1-phase: I = P / (V · PF) 3-phase (balanced): I_L = P / (√3 · V_LL · PF) Apparent power: I (1Φ) = S / V I_L (3Φ) = S / (√3 · V_LL) Delta/Wye: Wye: I_L = I_phase Delta: I_L = √3 · I_phase
Inputs: P (W or kW), S (VA or kVA), V (V), V_LL (V), PF (0–1), I_phase (A). Output: I_L (A).
amps from kW calculator
Determine line current (A) with phase current and phase voltage, or convert power (kW/kVA) and phase current or phase voltage to line current (A) on DC, single-phase and three-phase (wye/delta). Enter AC real power in PF.Phase voltages may also be entered and conversion shown step-by-step in typical cases (kW to A, kVA to A, phase to line). Apply it in checking the panel design, conductor sizing a test, and rapid verification of the load. When sizing breakers or conductors, remember to use power factor of AC loads, and to use code derating of continuous loads in the calculation.
balanced 3-phase current calc
| Type | Input | Values | Formula Used | I_L (A) |
|---|---|---|---|---|
| DC | P,V | 1200 W, 48 V | I=P/V | 25.00 |
| 1-phase AC | P,V,PF | 2300 W, 230 V, 0.8 | I=P/(V·PF) | 12.50 |
| 3-phase (wye) | P,V_LL,PF | 10 kW, 400 V, 0.9 | I_L=P/(√3·V_LL·PF) | 16.04 |
| 3-phase (delta given I_phase) | I_phase | I_phase=30 A | I_L=√3·I_phase | 51.96 |
| 3-phase (from S) | S,V_LL | 50 kVA, 11 kV | I_L=S/(√3·V_LL) | 2.63 |
