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kW to Amps
Generator Sizing

Generator kW to Amps Calculator

Convert generator kilowatt ratings to amps to properly size cables and transfer switches. Supports single and three-phase generators.

Generator Load Calculator

Typical generators run at 0.8 Power Factor

Note: Check if your rating is kW or kVA

Default 0.8 for most diesel generators

Estimated Current Output
36.08
Amps (A)

Generator Amps Chart

Values based on PF 0.8 (Standard for Generators)

Generator kW 120V (1-Phase) 240V (1-Phase) 400V (3-Phase) 480V (3-Phase)
5 kW 41.67 A* 20.83 A* 9.02 A 7.52 A
10 kW 83.33 A* 41.67 A* 18.04 A 15.04 A
15 kW 125.00 A* 62.50 A* 27.06 A 22.55 A
20 kW 166.67 A* 83.33 A* 36.08 A 30.07 A
25 kW 208.33 A* 104.17 A* 45.11 A 37.59 A
30 kW 250.00 A* 125.00 A* 54.13 A 45.11 A
40 kW 333.33 A* 166.67 A* 72.17 A 60.14 A
50 kW 416.67 A* 208.33 A* 90.21 A 75.18 A
60 kW 500.00 A* 250.00 A* 108.25 A 90.21 A
80 kW 666.67 A* 333.33 A* 144.34 A 120.28 A
100 kW 833.33 A* 416.67 A* 180.42 A 150.35 A
125 kW 1041.67 A* 520.83 A* 225.53 A 187.94 A
150 kW 1250.00 A* 625.00 A* 270.63 A 225.53 A
200 kW 1666.67 A* 833.33 A* 360.84 A 300.70 A
250 kW 2083.33 A* 1041.67 A* 451.05 A 375.88 A
300 kW 2500.00 A* 1250.00 A* 541.27 A 451.05 A
400 kW 3333.33 A* 1666.67 A* 721.69 A 601.41 A
500 kW 4166.67 A* 2083.33 A* 902.11 A 751.76 A
800 kW 6666.67 A* 3333.33 A* 1443.38 A 1202.81 A
1000 kW 8333.33 A* 4166.67 A* 1804.22 A 1503.52 A

*Small single phase portable generators are usually rated at 1.0 PF, while larger units are 0.8.

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.