Calculator InputLive calculation
kW to Amps Single Phase Calculator
Pre-configured for single-phase AC circuits. Adjust values below.
Conversion Result
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Enter values to calculate
Formula Used
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Watts
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Milliamps
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Horsepower
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BTU/hr
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How kW to Amps Single Phase Works
1
Enter the power in kilowatts (kW)
This is the real power consumed by the load. Check the equipment nameplate or energy meter for the kW rating.
2
Enter the voltage in volts (V)
Measure the voltage between the line and neutral conductors with a multimeter. Common single-phase voltages are 120V, 220V, and 240V.
3
Enter the power factor (PF)
Power factor ranges from 0 to 1. Resistive loads like heaters have PF close to 1.0. Motors and compressors typically have PF between 0.7 and 0.9.
4
Read the result in amps
The calculator divides watts by the product of voltage and power factor to give the current draw in amperes.
kW to Amps Single Phase Formula
Single-Phase ACI = (kW × 1000) ÷ (V × PF)
Primary formula for single-phase circuits. Divides power in watts by voltage times power factor.
With PF = 1I = (kW × 1000) ÷ V
Simplified version when the load is purely resistive (PF = 1.0).
ReversekW = (I × V × PF) ÷ 1000
Convert amps back to kilowatts by multiplying current, voltage, and power factor.
The single-phase kW to amps formula uses 3 variables: power (kW), voltage (V), and power factor (PF). The formula is I = (kW × 1000) ÷ (V × PF).
For example, a 5 kW load at 220V with a power factor of 0.8 draws: I = (5 × 1000) ÷ (220 × 0.8) = 28.41 amps. The same 5 kW load at PF 1.0 draws only 22.73 amps.
Single-phase power is used in residential wiring, small commercial buildings, and portable equipment. The NEC requires calculating the full-load current to select proper wire gauge and circuit breaker sizing.
Frequently Asked Questions
Single-phase power uses one alternating voltage waveform delivered between a line conductor and neutral. It is the standard power supply in homes and small businesses.
Use PF 0.8 as a general-purpose default. Resistive loads (heaters, incandescent lights) use PF 1.0. Motors and fluorescent lighting typically operate at PF 0.7 to 0.9.
3 kW at 220V single-phase with PF 0.8 equals 17.05 amps. With PF 1.0, it equals 13.64 amps.
Yes. Most residential outlets provide single-phase AC power. In the US, this is typically 120V or 240V. In most other countries, it is 220V or 230V.
Yes. Enter 110 in the voltage field. The calculator works for any voltage value from 1V to 999V.