CalcPanel

Amps to kW Calculator

Convert amps to kW (or reverse kW to amps) with voltage, phase, and power factor—instant bidirectional A ↔ kW for motor nameplates, feeders, and industrial AC loads.

Calculator

Quick: amps + voltage → kW. Advanced: reverse direction, three-phase √3, and adjustable PF.

Balanced RMS line current. Example: 100 A feeder or motor FLA.
Three-phase: use line-to-line voltage.
Resistive ≈ 1.0; motors/UPS often 0.80–0.95.
Phase

About this calculator

This amps to kW calculator converts line current (A) to real power (kW) using voltage, phase, and PF. It is not an appliance watts converter—use Watts to Amps for watt-scale loads. For √3 teaching and three-phase worked examples, see the 3-Phase Power Calculator. Browse the power calculator hub.

Calculation Results

≈ 70.67 kW (70,668 W)

100 A · 480 V · PF 0.85 · Three Phase

Formula: kW = V × I × √3 × PF ÷ 1000

Balanced-load estimate from real power. Harmonics, motor starting, and continuous-load 125% breaker margins are not applied here.

Continue Your Calculation

Have kW from amps? Continue to kVA conversion for UPS/transformer/feeder sizing (link updates from your result).

kW to kVA →

Amps to kW quick reference

Uses PF and phase. Click a row to load the calculator.

Power Voltage Current
120 V 1φ PF 12.4 kW
240 V 1φ PF 120.83 A
400 V 3φ PF 0.85≈ 29.44 kW
480 V 3φ PF 0.85≈ 70.67 kW
480 V 3φ PF 0.85≈ 14.15 A
400 V 3φ PF 0.85≈ 37.36 A

Amps to kW formula

Single-phase: kW = V × I × PF ÷ 1000  ·  I = kW × 1000 ÷ (V × PF)

Three-phase: kW = V × I × √3 × PF ÷ 1000  ·  I = kW × 1000 ÷ (V × √3 × PF)

  • kW — real power (kilowatts)
  • V — RMS voltage (line-to-line for 3φ)
  • PF — power factor (0–1)
  • I — line current (amps)

Example: 480 × 100 × √3 × 0.85 ÷ 1000 ≈ 70.67 kW.

Need apparent power next? kW to kVA calculator. Need apparent-power amps? kVA to Amps.

When to use which power tool

Goal Tool
Convert amps ↔ kW (real power)This page
Convert watts ↔ amps (appliance scale)Watts to Amps
Convert kVA ↔ amps (apparent power)kVA to Amps
Convert kW ↔ kVA with PFkW to kVA
Three-phase kW/kVA from V·A·PF3-Phase Power

Frequently Asked Questions

How do I convert amps to kW?

Single-phase: kW = V × I × PF ÷ 1000. Three-phase: kW = V × I × √3 × PF ÷ 1000. Example: 100 A at 480 V 3φ PF 0.85 ≈ 70.67 kW.

How do I convert kW to amps?

Single-phase: I = kW × 1000 ÷ (V × PF). Three-phase: I = kW × 1000 ÷ (V × √3 × PF). Example: 10 kW at 480 V 3φ PF 0.85 ≈ 14.15 A.

Do I need power factor for amps to kW?

Yes for AC real power. Resistive loads can use PF ≈ 1.0. Motors and UPS loads often use 0.8–0.95. If you already know kVA, use kVA to Amps instead.

What is 100 A in kW at 480 V 3-phase?

At 480 V three-phase PF 0.85: ≈ 70.67 kW (V × I × √3 × PF ÷ 1000). Use the 100 A preset above.

Is amps to kW the same as kVA to amps?

No. Amps↔kW needs PF (real power). kVA→amps does not. For watt-scale appliances use Watts to Amps; this page owns kilowatt industrial conversions.