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

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

The following two (basic and advanced) calculators can be used to calculate and convert the electric current in amperes from electric power in watts and voltage in volts.

In Advanced Watts to Amps Calculator, We can calculate the electric current in amperes, milliamperes or kiloamperes from electric power in in watts, milliwatts or kilowatts and RMS voltage in volts for DC circuits, AC, 1-Phase and 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 (Y )and Delta (Δ) Connections.

In Simple Watts to Amps calculator, any two known values among three (P, I and V) can be used to calculate power in watts, current in amperes or voltage in volts.

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

Watts to Amps Calculator

Advanced Watts to Amps Calculator

  
A
kA
mA
Simple Watts to Amps Calculator

Watts
Volt
      

Note 2: For higher values like, 5×103, 10×10-6, 1.6 x1012, enter the value like this for scientific notation as 5e3, 10e-6, 1.6e12 etc.

DC Power in Watts to Amps Conversion

I = P ÷ V

AC Single Phase Power in Watts to Amps Conversion

I = P ÷ (V  x Cosθ)

AC Three Phase Power in Watts to Amps Conversion

Conversion with Line to Line Voltage (VL-L)

I = P ÷ (√3 x VL-L x Cosθ)

Conversion with Line to Neutral Voltage (VL-N)

I = P ÷ (3 x VL-N 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

Watts to Amps Calculator and Conversion

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 Watts to Amps?

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.

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

I = P ÷ V

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

I = √(P ÷ R)

I = V ÷ R

Examples:

Current = Power ÷ Voltage

  • I = 600W ÷ 120V = 5 A
  • I = 2070W ÷ 5V = 9 W
  • I = 48W ÷ 12V = 4 A

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

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

Current in AmpPower in WattsVoltage in Volts
1120 W120V AC
230 W230V AC
12 W12V DC
5600 W120V AC
1150 W230V AC
60 W12V DC
101200 W120V AC
2300 W230V AC
120 W12V DC
151800 W120V AC
3450 W230V AC
180 W12V DC
202400 W120V AC
4600 W230V AC
240 W12V DC
303600 W120V AC
6900 W230V AC
360 W12V DC
506000 W120V AC
11500 W230V AC
600 W12V DC
708400 W120V AC
16100 W230V AC
840 W12V DC
10012000 W120V AC
23000 W230V AC
1200 W12V DC

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