Choose Solve for to calculate current, power, voltage, or amps per kilowatt. This model applies to steady DC or single-phase AC at power factor 1, using RMS voltage and current.

Uses P = V × I for steady DC, or single-phase AC at power factor 1 using RMS values. Does not model other AC power factors or three-phase power.

Electrical power at the circuit, not mechanical output power.

Amps Per Kw Formula

The amps per kW calculation is based on the basic electrical power formula. This calculator uses watts, volts, and amps as the base units, then converts your selected units as needed.

I = P / V
  • I = current in amps (A)
  • P = power in watts (W)
  • V = voltage in volts (V)

To calculate amps from kilowatts, first convert kilowatts to watts:

P(W) = P(kW) × 1000

Then divide watts by volts:

I(A) = (P(kW) × 1000) / V

Choose the unknown in Solve for and enter the displayed known values. Amps per kilowatt needs voltage only: A/kW = 1000/V. The calculator can also solve for power or voltage:

P = V × I
V = P / I
  • Calculate current: enter power and voltage to find amps.
  • Calculate power: enter voltage and current to find watts, kilowatts, or megawatts.
  • Calculate voltage: enter power and current to find volts, kilovolts, or megavolts.
  • Unit conversion: power is converted to watts, voltage to volts, and current to amps before the formula is applied.

Common Amps for 1 kW at Different Voltages

This table assumes DC or single-phase AC at power factor 1. It compares current for a 1 kW electrical load.

Power Voltage Current
1 kW 12 V 83.33 A
1 kW 24 V 41.67 A
1 kW 120 V 8.33 A
1 kW 240 V 4.17 A
1 kW 480 V 2.08 A

Power and Current Unit Conversions

Unit Equivalent Use in Formula
1 kW 1,000 W Convert to watts before using P = V × I
1 MW 1,000,000 W Convert to watts
1 kV 1,000 V Convert to volts
1 mA 0.001 A Convert to amps
1 kA 1,000 A Convert to amps

Example Calculations

Example 1: Find amps from kilowatts and volts

You have a 2.5 kW DC or unity-power-factor single-phase load connected to 240 V.

I = (2.5 × 1000) / 240
I = 2500 / 240 = 10.4167 A

The current is about 10.42 amps.

Example 2: Find power from volts and amps

You have a DC or unity-power-factor single-phase circuit with 120 V and 8 A.

P = 120 × 8
P = 960 W = 0.96 kW

The power is 960 watts, or 0.96 kilowatts.

FAQs

How many amps are in 1 kW?

There is no single amp value for 1 kW because amps depend on voltage and, for AC, phase configuration and power factor. Under this calculator’s DC or unity-power-factor single-phase assumption, At 120 V, 1 kW is 8.33 A. At 240 V, 1 kW is 4.17 A. Higher voltage means lower current for the same power.

Why does the calculator need voltage to find amps?

Amps measure current, while kilowatts measure power. Voltage links the two values. The formula is amps = watts ÷ volts, so the voltage must be known before current can be calculated.

Does this include power factor or three-phase power?

No. This calculation uses the basic formula P = V × I. It is suitable for simple DC calculations or ideal single-phase cases where power factor is treated as 1. For AC loads with power factor or three-phase systems, additional terms are needed.