Amps to kW Calculator

Q: How many kW is 100 amps at 240 V?

DC or resistive: 100 × 240 ÷ 1,000 = 24 kW. AC at PF 0.85: 20.4 kW.

Q: How many kW is 32 amps?

At 230 V single-phase with PF 1, 7.36 kW; at PF 0.9, 6.62 kW. At 400 V three-phase with PF 0.85, 18.8 kW.

Q: How many amps is 1 kW?

At 230 V single-phase and PF 1: 4.35 A. At 120 V: 8.33 A. Use the kW to amps calculator for other cases.

Q: Is amps × volts kW or kVA?

On DC circuits it is watts (divide by 1,000 for kW). On AC circuits it is VA, and you multiply by the power factor to get watts.

Convert amps to kilowatts (kW) for DC, single-phase and three-phase circuits. Multiply current by voltage (and power factor and √3 for AC) and divide by 1,000.

CIRCUIT TYPE

⚡ CURRENT

🔌 VOLTAGE

REAL POWER

4.8 kW

IN WATTS

4,800 W

CIRCUIT

FORMULA

kW=(I×V)/1000

💡 How to Convert Amps to kW

To convert amps to kW, multiply the current by the voltage, then by the power factor for AC (and also by √3 for three-phase), and divide by 1,000. For DC circuits, kW is simply amps × volts ÷ 1,000.

Amps to kW formulas

DC: kW = I × V ÷ 1,000
Single-phase AC: kW = I × V × PF ÷ 1,000
Three-phase AC: kW = I × V_L-L × PF × √3 ÷ 1,000

Worked examples

DC battery system: 100 A at 48 V = 4.8 kW.
Single-phase 32 A circuit at 230 V (PF 0.95): 32 × 230 × 0.95 ÷ 1,000 = 6.99 kW.
Three-phase 63 A supply at 400 V (PF 0.85): 63 × 400 × 0.85 × 1.732 ÷ 1,000 = 37.1 kW.

Amps to kW table

120 V column assumes a resistive load (PF 1.0); 230/240 V columns use PF 0.9; three-phase columns use PF 0.85.

Amps	120 V (PF 1)	230 V 1φ	240 V 1φ	400 V 3φ	480 V 3φ
5	0.6	1.03	1.08	2.94	3.53
10	1.2	2.07	2.16	5.89	7.07
15	1.8	3.1	3.24	8.83	10.6
16	1.92	3.31	3.46	9.42	11.31
20	2.4	4.14	4.32	11.78	14.13
30	3.6	6.21	6.48	17.67	21.2
32	3.84	6.62	6.91	18.84	22.61
50	6	10.35	10.8	29.44	35.33
63	7.56	13.04	13.61	37.1	44.52
100	12	20.7	21.6	58.89	70.67
200	24	41.4	43.2	117.78	141.34

Why power factor matters for AC

On AC circuits, amps × volts gives apparent power (VA). Only the in-phase part of the current does useful work, so real power in kW is lower by the power factor. Resistive loads like kettles and heaters have a PF close to 1, so amps × volts is very close to watts for them. Motors and older fluorescent lighting have lower power factors.

Checking a supply's capacity

Converting a breaker or service rating to kW shows how much load it can carry. A 100 A single-phase service at 240 V can carry 24 kVA, which is about 21.6 kW at PF 0.9. Continuous loads are usually limited to 80% of the breaker rating.

Related conversions: kW to amps · amps to watts · amps to kVA

AC single-phase kW = amps × volts × PF ÷ 1,000. DC kW = amps × volts ÷ 1,000. 20 A at 240 V DC = 4.8 kW.