Watts (W) to Amps (A) Conversion Calculator

Converting amps to watts can be done using the Watt's Law power formula. The Watt's Law formula is all that's needed for this conversion. You can calculate Amps using the relationship between Amps, Volts and Watts. To calculate Watts to Amps, simply use our free calculator.

Watts To Amps Calculator

Current type

Real Power (Watts)

Select Voltage Type:

Voltage (volts)

Power factor (≤1)

Current (amps)

Current (milliamps)

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Conversion using the Watts to Amps Formula

DC Watts to Amps Calculation formula

The current I in amps A is calculated as the Real Power in watts w, divided by voltage in volts v. Plug these values into the formula:

Current(I) = Real Power(P) Voltage(V)

or, I(A) = P(W) V(V)

or, Amps = Watts Volts

For Example, Let's convert 160 watts to current using a DC circuit with 12 volts of Voltage.

Single Phase Watts to Amps Calculation formula

The Current I in amps A is calculated as the Real Power p in Watts w, divided by the power factor in pf times the RMS voltage in volt v. Plug these values into the formula:

Current(I) = Real Power(P) Voltage(V) × Power factor (pf)

or, I(A) = P(W) V(V) × pf

or, Amps = Watts Volts × pf

For Example, let's convert 1400 watts to current for an AC electrical circuit with 230 volts of Voltage and a power factor of 0.8.

3-Phase Watts to Amps Calculation formula

Calculation with Line to Line voltage

The 3 Phase Current I in amps A is Calculated as the Real Power P in watts w, divided by the square root of 3 times the power factor in pf times the line-to-line RMS voltage V_L-L in volts v. Plug these values into the formula:

Current(I) = Real Power(P) 3 × Voltage(V) × Power factor (pf)

or, I(A) = P(W) 3 × V(Line-Line) × pf

or, Amps = Watts 3 × Volts × pf

For Example, let's convert 1600 watts to current for an AC Electrical circuit with 440 volts of Voltage and a power factor of 0.8.

Calculation with Line to Neutal voltage

The 3 Phase Current I in amps A is Calculated as the Real Power P in watts w, divided by the 3 times the power factor in pf times the line-to-neutral RMS voltage V_L-N in volts v. Plug these values into the formula:

Current(I) = Real Power(P) 3 × Voltage(V) × Power factor (pf)

or, I(A) = P(W) 3 × V(Line-Neutral) × pf

or, Amps = Watts 3 × Volts × pf

For Example, let's convert 1400 watts to current for an AC electrical circuit with 440 volts of Voltage and a power factor of 0.8.

How to use Watts to Amps Calculator?

To use the above "Watts to Amps Conversion Calculator" follow the below steps:

1. Select Phase Type: Choose between DC Line, Single Phase Line, or 3 Phase Line by choosing the appropriate option from the dropdown.

2. Enter Real Power: Input the Real Power in watts or Load watts value in the specific input box. You can enter the value in millivolts mw, Watts W, kilowatts KW, & Megawatts MW by choosing the appropriate option from the dropdown.

Fig-2: How to Use Watts to Amps Calculator

3. Enter Supply Voltage: Input the supply voltage or Load voltage value in the specified input box. You can enter the value in millivolts mV, Volts V, Kilovolts kV & MegaVolt MV by choosing the appropriate option from the dropdown.

4. Select Voltage Type: Choose between Line to Line Voltage or Line to Neutral Voltage by choosing the appropriate option from the dropdown.

5. Enter Power Factor: Input the power factor of the Load in the provided input box. The power factor is a unitless value typically between 0 and 1.

6. Reset: Click the Reset If you want to reset the calculator to perform another conversion, you can click the Reset button, and all input fields will be cleared.

7. Calculate: Click the Calculate button to obtain the results. The calculated results will be displayed in the Results: section.

8. Swap: If you want to Swap the calculated to Exchange conversion, you can click the Swap button, and Calculate will be Exchange.

9. Result: The calculated "Result" will be displayed in the respective Result In output Amps output field.

Watts to Amperes DC line Comparison and Sizing Table

Input		Output
Watts [W]	Voltage [V]	Amps [A]
10 Watts	24 Volts	0.4166 Amps
20 Watts	24 Volts	0.8333 Amps
30 Watts	24 Volts	1.2500 Amps
40 Watts	24 Volts	1.666 Amps
50 Watts	24 Volts	2.0833 Amps
60 Watts	24 Volts	2.5 Amps
70 Watts	24 Volts	2.91 Amps
80 Watts	24 Volts	3.33 Amps
90 Watts	24 Volts	3.75 Amps
100 Watts	24 Volts	4.166 Amps
120 Watts	24 Volts	5 Amps

Watts to Amperes Single Phase line Comparison and Sizing Table

Input			Output
Watts [W]	Volts [V]	Power factor [PF]	Amps [A]
100W	220V	0.8PF	0.568A
200W	220V	0.8PF	1.1363A
300W	220V	0.8PF	1.7045A
400W	220V	0.8PF	2.2727A
500W	220V	0.8PF	2.8409A
600W	220V	0.8PF	3.4090A
700W	220V	0.8PF	3.977A
800W	220V	0.8PF	4.5454A
900W	220V	0.8PF	5.1136A
1000W	220V	0.8PF	5.681A
1200W	220V	0.8PF	6.8181A

Watts to Amperes 3 Phase line Comparison and Sizing Table

Input			Output
watts [W]	volts [V]	power factor [PF]	amps [A]
400W	380V	0.9PF	0.6752A
500W	380V	0.9PF	0.844A
600W	380V	0.9PF	1.0128A
700W	380V	0.9PF	1.1817A
800W	380V	0.9PF	1.350A
900W	380V	0.9PF	1.5193A
1000W	380V	0.9PF	1.6881A
1200W	380V	0.9PF	2.0257A
1300W	380V	0.9PF	2.1946A
14000W	380V	0.9PF	2.3634A
1500W	380V	0.9PF	2.5322A

Typical power factor values

Do not use typical power factor values for accurate calculations.

Equipment and appliances				cos θ	tan θ
Motor	Common induction motor	loaded at	0 %	0.17	5.80
			25%	0.55	1.52
			50 %	0.73	0.94
			75 %	0.80	0.75
			100 %	0.85	0.62
Lamps	Incandescent lamps			1.0	0
	Fluorescent lamps (uncompensated)			0.5	1.73
	Fluorescent lamps (compensated)			0.93	0.39
	Discharge lamps			0.4 to 0.6	2.29 to 1.33
Ovens	Ovens using resistance elements			1.0	0
	Induction heating ovens (compensated)			0.85	0.62
	Dielectric type heating ovens			0.85	0.62
Welding	Resistance-type soldering machines			0.8 to 0.9	0.75 to 0.48
	Fixed 1-phase arc-welding set			0.5	1.73
	Arc-welding motor-generating set			0.7 to 0.9	1.02 to 0.48
	Arc-welding transformer-rectifier set			0.7 to 0.8	1.02 to 0.75
Arc furnace				0.8	0.75
Power Factor Value Conversion Table

Frequently Asked Questions - FAQs for Watts to Amps Calculator

What is 1 amp?

1 ampere is the current in which one coulomb of charge travels across a given point in 1 second. That's why an average lightning bolt carries around 5 coulombs of charge, even though its current may be tens of thousands of amps.

Amperes (A) = Watts (W) ÷ Volts (V)

Therefore, 1000 watts equate to approximately 4.54 amperes at a voltage of 220 volts.

What is 2 watt current?

2 watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of 2 volt (V), meaning the watt is equivalent to the volt-ampere.

What is a kW?

A kW or kilowatt is a unit of measurement for the rate of power an electrical device or load uses. The higher the kW of a device, the more electrical power is needed to operate it. A kilowatt is 2000 watts (W). 2000 W = 2 kW.

Is kW and kVA the same?

KVA is used to represent apparent power and Kilowatts (kW) is used to represent the Real power of an electrical system. Its usage differs in electrical circuits because of the difference between AC and DC circuits. When considering a DC circuit, the kW and kVA are equal because the current Flow does not get out of the phase line.

About the Author

Md Jony Islam

Jony is a passionate writer and web developer. He enjoys sharing insights about technology, web development, and design. When he's not writing, he loves hiking and exploring the outdoors.

Watts (W) to amps (A) Conversion Calculator | Watts to Amps Convert | Watts to amps formula