3 Phase Power Calculator

Wye: I_line = I_phase and V_L-L = √3 × V_L-N. Delta: V_L-L = V_phase and I_line = √3 × I_phase. This calculator expects line-to-line V and line A—see Delta / Wye table. Example: 17 A line on a Delta load → phase/coil ≈ 9.8 A.

At 400 V line-to-line: 1 kW ≈ 1.44 A at PF 1.0, or ≈ 1.70 A at PF 0.85. Formula: I = (kW × 1000) ÷ (√3 × V × PF). At 480 V and PF 0.85, 1 kW ≈ 1.42 A. Open 1 kW @ 400 V preset or see kW → amps table.

I (A) = (kW × 1000) ÷ (√3 × V_L-L × PF) with line-to-line voltage. Example: 10 kW at 400 V, PF 0.85 ≈ 17 A. For apparent-power workflows, convert kW to kVA first on kW to kVA, then use kVA to amps only when you already know kVA.

1.73 is √3 rounded (≈ 1.732). Balanced three-phase real power with line-to-line voltage and line current is P = √3 × V × I × PF. Example: 400 V, 10 A, PF 0.85 → about 5.9 kW. Omitting √3 under-estimates three-phase power by about 73%. Full derivation and examples: 3 phase power formula · page note Why multiply by 1.73.

I (A) = (kW × 1000) ÷ (√3 × V_L-L × PF), or from apparent power I = (kVA × 1000) ÷ (√3 × V_L-L). Example: 10 kW at 400 V, PF 0.85 ≈ 17 A. Worked equations: 3 phase power formula. Instant check: this calculator or kVA to amps.

Amps depend on line-to-line voltage and PF. At 400 V, PF 0.85: I ≈ 7.5 × 1000 ÷ (√3 × 400 × 0.85) ≈ 12.7 A. At 480 V, PF 0.85: ≈ 10.6 A. Enter your site V and PF above for an instant check—more worked cases on the 3 phase power formula page. Do not size breakers from a single generic “7.5 kW = X A” table alone.

3-phase 240 V usually means 240 V line-to-line (seen on some North American delta / high-leg buses and older plant systems). Balanced real power is still P = √3 × 240 × I × PF ÷ 1000. Do not confuse with single-phase 240 V (no √3) or 208Y/120 V wye—confirm meter/nameplate voltage first. Math and examples: 3 phase power formula · concepts: what is 3 phase power.

A 3 phase power calculator computes balanced kW and kVA from line-to-line voltage, line current, and power factor using P = √3 × V × I × PF. Example: 400 V, 52 A, PF 0.85 ≈ 30.6 kW. Same tool answers “3 phase electrical calculations” and “3 phase AC power calculation” searches.

Yes. Enter line-to-line voltage, line current, and power factor above for balanced kW and kVA using P = √3 × V × I × PF. Formula details: Formula & Explanation on this page · 3 phase power formula guide.

Typical 3 phase electrical calculations convert among kW, kVA, and line amps with P = √3 × V × I × PF and kVA = √3 × V × I ÷ 1000. Enter V, A, and PF above for an instant screen—then size cable/breaker separately. Worked equations: 3 phase power formula & examples.

Line current flows in each supply conductor; phase current flows in each winding. In delta, line current equals phase current times √3; in wye (star), line current equals phase current. Field work usually starts from line quantities.

kVA = kW ÷ power factor. Example: 10 kW at PF 0.85 gives about 11.76 kVA. The calculator shows both once V, I, and PF are set.

Resistive loads are near PF 1.0; motors often 0.8–0.9; electronics often 0.9–0.95. For mixed plants use a weighted average or the lowest PF for a conservative envelope; 0.85 is a common placeholder when data is thin.

Protective devices are sized above steady-state FLA for continuous-duty margins (often 125% where codes require), inrush, coordination, and future load growth—always follow NEC, IEC 60364 family rules, or your local code and manufacturer tables.

Yes. Set System type → Single-phase. Real power uses P = V × I × PF (no √3); from kW, I = kW×1000 ÷ (V × PF). Keep three-phase selected when you need √3 and line-to-line volts.

I (A) = (kW × 1000) ÷ (√3 × V_L-L × PF). Example: 10 kW at 400 V and PF 0.85 is about 17 A. Always use measured V and PF when commissioning.

kW is real power; kVA is apparent power. kW = kVA × PF. Size transformers and generators on kVA; utility demand charges often track both kW and PF.

1 HP ≈ 0.746 kW. Convert HP to kW, then use the three-phase current formula with nameplate PF and efficiency when known; remember locked-rotor and starting multiples are not modeled here.

Use line-to-line (phase-to-phase) voltage. Nominal 380/400/415 V is common in IEC markets; 480 V is common in North America. Prefer measured bus voltage at the equipment terminals when harmonics or long feeders skew the nameplate assumption.

If kW and kVA are known, PF = kW ÷ kVA. If kW, line-to-line voltage, and line current are known, PF = (kW × 1000) ÷ (√3 × V × I). Example: 10 kW at 400 V with 20 A line current is about 0.72 PF. Very low PF may trigger correction or utility penalties.

Mismatch comes from nominal versus measured voltage, true PF versus assumed PF, phase unbalance, harmonics, VFD waveforms, and instrument accuracy. Use clamp-on RMS readings at the load and reconcile with the site energy meter when disputes arise.

A 3 phase current calculator solves line amps from kW or kVA with line-to-line voltage (and PF when starting from kW): I = (kW × 1000) ÷ (√3 × V × PF). This page does that path; if you already know kVA, use kVA to amps.

No. 3 phase voltage is the system line-to-line (or line-to-neutral) rating—an input. 3 phase power is kW/kVA from V, I, and PF. Enter your bus voltage here; do not treat “400 V three-phase” alone as a power result.

S (kVA) = √3 × V_L-L × I ÷ 1000 (balanced). Real power uses the same √3 term with PF: P (kW) = √3 × V × I × PF ÷ 1000. More drills: 3 phase power formula & examples.

Use nameplate or measured P = √3 × V × I × PF × η when efficiency is known; this calculator uses the electrical √3 form without η. Convert HP with 1 HP ≈ 0.746 kW, then solve current or kVA. For transformer kVA from plant kW, use transformer size.

For kVA transformer sizing from load kW and PF, open the kVA transformer calculator. This 3 phase power page computes feeder kW/kVA/current; it does not pick catalog transformer sizes.