3-Phase Systems

kW to Amps 3 Phase Calculator

Convert kilowatts to amps for three-phase electrical systems. Supports Line-to-Line and Line-to-Neutral voltage configurations.

3-Phase Calculator

Enter power and voltage to calculate current

Decimals:

Power (kW)

Voltage (V)

Voltage Type

Power Factor (PF)

Current Result

13.93

Amps (A)

Formula: I = 10000 / (√3 × 415 × 0.85) = 13.93 A

3-Phase Conversion Table

Line-to-Line voltage at PF = 0.85

Power (kW)	380V	400V	415V	440V	480V
1 kW	1.79 A	1.70 A	1.64 A	1.54 A	1.42 A
2 kW	3.57 A	3.40 A	3.27 A	3.09 A	2.83 A
3 kW	5.36 A	5.09 A	4.91 A	4.63 A	4.25 A
5 kW	8.94 A	8.49 A	8.18 A	7.72 A	7.08 A
7.5 kW	13.41 A	12.74 A	12.28 A	11.58 A	10.61 A
10 kW	17.87 A	16.98 A	16.37 A	15.44 A	14.15 A
15 kW	26.81 A	25.47 A	24.55 A	23.16 A	21.23 A
20 kW	35.75 A	33.96 A	32.73 A	30.87 A	28.30 A
25 kW	44.69 A	42.45 A	40.92 A	38.59 A	35.38 A
30 kW	53.62 A	50.94 A	49.10 A	46.31 A	42.45 A
50 kW	89.37 A	84.90 A	81.84 A	77.19 A	70.75 A
75 kW	134.06 A	127.36 A	122.75 A	115.78 A	106.13 A
100 kW	178.75 A	169.81 A	163.67 A	154.37 A	141.51 A

Understanding Three-Phase Power

Line-to-Line vs Line-to-Neutral

In a three-phase system, Line-to-Line voltage is measured between any two phases, while Line-to-Neutral is measured from one phase to the neutral point.

The relationship between them is: V_LL = √3 × V_LN

Common Applications

• Industrial motors and machinery
• Commercial HVAC systems
• Large pumps and compressors
• Data centers and server rooms

Calculator

Frequently Asked Questions

How many amps is 1 kW?+

It depends on voltage and system type. For DC: I = 1000 W ÷ V (e.g., at 230 V, ≈ 4.35 A). For AC single-phase: I = 1000 ÷ (V × PF). For three-phase (L-L): I = 1000 ÷ (√3 × VLL × PF).

How many kilowatts is 1 ampere?+

For DC: kW = (V × 1 A) ÷ 1000. For example, at 240 V → 0.24 kW. For AC systems, multiply by the power factor and use the correct single-phase or three-phase formula.

How many amps make 1 kWh?+

kWh is energy, not current. To relate amps to kWh you must include voltage, power factor (for AC), and time. For example, 10 A at 230 V, PF 1 for 1 hour ≈ 2.3 kWh.

What is 5 kW in amps?+

It depends on voltage, system, and PF. Single-phase 240 V at PF 0.9 → I ≈ 5000 ÷ (240 × 0.9) ≈ 23.15 A. Three-phase 400 V L-L at PF 0.9 → I ≈ 5000 ÷ (√3 × 400 × 0.9) ≈ 8.01 A.

Can you convert kW to amps?+

Yes! You can convert kW to amps if you know the voltage and power factor. Use our calculator above or apply the formula: I = P ÷ (V × PF) for single-phase, or I = P ÷ (√3 × V × PF) for three-phase systems.

What is the kW to amps formula?+

For DC: I = P ÷ V. For single-phase AC: I = P ÷ (V × PF). For three-phase AC (line-to-line): I = P ÷ (√3 × V × PF). P is power in watts, V is voltage, and PF is power factor.

How to calculate kW to amps at 240V?+

At 240V single-phase with PF 0.9: Amps = (kW × 1000) ÷ (240 × 0.9). For example, 5 kW = 5000 ÷ 216 = 23.15 A. Use PF = 1.0 for resistive loads like heaters.

What power factor should I use?+

Use PF 1.0 for resistive loads (heaters, incandescent lights). Use PF 0.85-0.95 for motors, and 0.9-0.98 for modern LED lighting. When in doubt, use 0.85 for a conservative estimate.

What is the difference between single-phase and 3-phase conversion?+

Single-phase uses I = P ÷ (V × PF). Three-phase includes √3 (≈1.732) factor: I = P ÷ (√3 × V × PF). Three-phase carries more power at lower current, making it more efficient for high-power applications.

How to convert generator kW to amps?+

For generator sizing, use the same formulas based on phase type. A 10 kW single-phase generator at 240V, PF 0.9 provides about 46.3 A. For three-phase at 415V, PF 0.85, it provides about 16.4 A per phase.

What is the difference between kW and kWh?+

kW (kilowatts) measures power — the rate of energy use at any instant. kWh (kilowatt-hours) measures energy — total power consumed over time. 1 kW running for 1 hour = 1 kWh.

How to convert kW to amps at 440V three-phase?+

At 440V three-phase (L-L) with PF 0.85: Amps = (kW × 1000) ÷ (1.732 × 440 × 0.85). For 10 kW: 10000 ÷ 647.5 = 15.44 A per phase. This is common for industrial motors.