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Amps to Watts Calculator & Conversion – DC/AC (1 & 3 Phase)

How to Convert Amperes (A) to Watts (W)? Simple and Advanced Calculators

You can use the following two calculators (Simple and Advance) to calculate the electric power in watts from electric current in amperes and electric voltage in volts.

In Simple Amps to Watt calculator, you can calculate any value of Power in Watts, Current in Amperes and Voltage in Volts by entering any two known values for P, V or I.

In Advanced Amps to Watts Calculator, you can calculate the electric power in watts, milliwatts or kilowatts from electric current in amperes, milliamperes and kiloamperes and RMS voltage in volts for DC circuits, AC 1-Phase Circuits and AC 3-Phase circuits having the Line to Line voltage (Delta Connection), Line to Neutral voltage (Star Connection) and Power Factor (P.F). You may read more about the difference between Star and Delta Connections – Comparison Of Y/Δ.

Note 1: If you are on mobile phones, click on the “…” dotes beside the “Advanced Calculator” to select another simple calculator. For better experience through mobile phones, use the calculator in landscape position.

Advanced Amps to Watts Calculator

  
W
kW
mW
Simple Amps to Watts Calculator

Volt
Watts
      

Note 2: For higher values like, 3×103, 5×10-6, 1.5 x1012, enter the value like this for scientific notation as 3e3, 5e-6, 1.5e12 etc.

DC Current in AMP to Watt Conversion

P = V x I

AC Single Phase Current in AMP to Watt Conversion

P = V x I x Cosθ

AC Three Phase Current in AMP to Watt Conversion

Conversion with Line to Line Voltage (VL-L)

P = √3 x VL-L x I x Cosθ

Conversion with Line to Neutral Voltage (VL-N)

P = 3 x VL-N x I x Cosθ

Where:

  • P = Power in Watts
  • V = Voltage in Volts
  • I = Current in Amperes
  • Cosθ = Power factor in AC circuits
  • VL-L = Line to Line Voltage in 3-Phase Circuits
  • VL-N = Line to Neutral Voltage in 3-Phase Circuits

Typical Power Factor Values for Equipment and Appliances

For accurate calculation, use the exact value of power factor instead of the typical value by calculation or check the nameplate data rating of the appliance.

Electrical Equipment and AppliancesP.F = Cosθ
Motor & TransformerInduction Motor at No Load0.35
Induction Motor at Full Load0.85
Transformer at No Load0.15
LampsIncandescent Lamps1.0
Fluorescent Lamps (Uncompensated)0.5
Fluorescent Lamps (Compensated)0.9
Discharge Lamps0.4 to 0.6
Mercury Vapor Lamp0.5
Sodium Vapor Lamp0.6-0.7
OvensOvens using Resistance Elements1.0
Induction Heating Ovens (Compensated)0.85
Dielectric Type Heating Ovens0.85
WeldingResistance Type Soldering Machines0.8 to 0.9
Fixed 1-phase Arc Welding Set0.5
Arc Welding Motor Generating Set0.7 to 0.9
Arc Furnace0.8 to 0.9
Arc Welding Transformer Rectifier Set0.7-0.8
AC-DC Drives

& Converters

AC-DC Converters0.95
AC Drive0.4-0.7
DC Drive0.6-0.9
Pure Resistive Load1
Pure Inductive & Capacitive Load0

How to Convert Amps to Watts?

The basic Amps to Watts calculator uses the Watt’s Law which states that “The total power of an electric circuit is equal to the product of electric current and voltage in that circuit”. i.e.

Power (P) in Watts = Voltage (V) in Volts x Current (I) in Amps

P = V x I

If we put the values of V and I in the above equations from Ohm’s law, we mat get the power as follow as well.

P = I2 x R

P = V2 ÷ R

Examples:

Watts = Voltage x Current

  • 120V x 10A = 1200 W
  • 230V x 5A = 1150 W
  • 12V x 3A = 36 W

Amps to Watts Calculator and Conversion

Equivalent Amps and Watts at 120V AC, 230V AC and 12V DC

The following table shows the different values of Wattage for 120V and 230V AC and 12V DC at unity power factor “1”.

Voltage in VoltsCurrent in AmpPower in Watts
120V AC 

1

120 W
230V AC230 W
12V DC12 W
120V AC 

5

600 W
230V AC1150 W
12V DC60 W
120V AC 

10

1200 W
230V AC2300 W
12V DC120 W
120V AC 

15

1800 W
230V AC3450 W
12V DC180 W
120V AC 

20

2400 W
230V AC4600 W
12V DC240 W
120V AC 

30

3600 W
230V AC6900 W
12V DC360 W
120V AC 

50

6000 W
230V AC11500 W
12V DC600 W
120V AC 

70

8400 W
230V AC16100 W
12V DC840 W
120V AC 

100

12000 W
230V AC23000 W
12V DC1200 W

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