Watts To Amps Calculator | Watts To Amps Conversion Formula

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Use this online  converter for converting Electric power(P in watts) to electric current(I) in amps (A) calculator.

Choose current type from drop-down list,input power(P in watts),voltage(in volts) and input the PF and click the Calculate button.

current type:
power in watts: W
voltage in volts: V
Current result in amps: A

How to convert electric power in watts (W) to electric current(I) in amps (A)?

watts to amps calculation formula in case of Direct Current 

I(in Amps) = P(in Watts) / V(in Volts)

So that you can define “Current are equivalent to the power(in watts) divided by volts(V).

amps(A) = watt(W) / volt(V)
or
A = W / V

I=The current I in amps (A)
p=the power P in watts (W)
V=the voltage V in volts (V)

Let’s take an example
Example#1
Wee need to Find out the current(I) in amps where the power(P) is 300 watts and the voltage(V) supply is 100 volts in the circuit.
I = 300W / 100V = 3A

How to convert watts to amps?

watts to amps calculation formula in AC single phase

I= Current in amps (A)
P=the power P in watts (W)
PF=the power factor PF
V=the Root Mean Square voltage V in volts (V)

I(in Amps) = P(in Watts) / (Power Factor × V(in Volts) )

So that you can define Current(in amps) are equal to the Power(in watts) divided by PF times volts(V).

amps(A) = watts(W) / (Power Factor × volts(V))

or you can re-write formula like this

A = W / (PF × V)

Let’s take an example
Example#1
Find out the current(I) in amps where  the power(P) is 300 watts and the PF is 0.8 and the Root Mean Square voltage(V) supply in the circuit is 100 volts
I = 300W / (0.8 × 100V) = 3.75A

watts to amps calculation formula in case of AC three phase line to line voltage

I=The phase current I in amps (A)
P=the real power P in watts (W)
PF=power factor PF
VL-L=the line to line Root Mean Square voltage VL-L in volts (V)

I(A) = P(in Watts) / (1.732 × Power Factor × VL-L(in Volts) )

So that you can define “Current(I) amps are equal to Power(in watts) divided by 1.732 PF times volts”

amps(A) = watts(W) / (√3 × PF × volts(V))

or You can re-write this formula like this

A = W / (√3 × PF × V)

Let’s take an example
Example#2
Find out the current(I) in amps where the power(P) is 300 watts, the PF is 0.8 and the Root Mean Square voltage(V) in the circuit is 100 volts.
I = 300W / (1.732 × 0.8 × 100V) =300/138.56=2.165A

In case of line to neutral voltage

I=The phase current I in amps (A)
P=the real power P in watts (W)
PF=the power factor PF
VL-0=the line to neutral Root Mean Square voltage VL-0 in volts (V)

I(A) = P(in Watts) / (3 × Power Factor × VL-0(in Volts) )

So that you can define Cuurent(I) amps are equal to the power(P in watts) divided by 3 times PF times volts(V).

amps(A) = watts(W) / (3 × PF × volts(V))

or you can rewrite this formula like this

A = W / (3 × PF × V)

Let’s take an example
Example#3
Find out the current(I) in amps where the power(P) is 300 watts, the PF is 0.8 and the Root Mean Square voltage(V) in the circuit is 100 volts
I = 300W / (3 × 0.8 × 100V) =300W/240=1.25A
where DC = Direct Current, AC = Alternating Current

You can easily calculate below conversion using this tool

  • 1 amp = watts
  • Watts to amps calculator AC
  • Watts to amps at 12V
  • Watts to amps 240V
  • Watts to amps at 220V
  • Watts to amps calculator DC
  • 1000 watts to amps

Watts to Amps at 5V
Power (W) Voltage (V) Amps (A)
5 5 1
10 5 2
15 5 3
20 5 4
25 5 5
30 5 6
35 5 7
40 5 8
45 5 9
50 5 10
55 5 11
60 5 12
65 5 13
70 5 14
75 5 15
Watts to Amps at 12V
Power (W) Voltage (V) Amps (A)
12 12 1
24 12 2
36 12 3
48 12 4
60 12 5
72 12 6
84 12 7
96 12 8
108 12 9
120 12 10
132 12 11
144 12 12
156 12 13
168 12 14
180 12 15
Watts to Amps at 110V
Power (W) Voltage (V) Amps (A)
110 110 1
220 110 2
330 110 3
440 110 4
550 110 5
660 110 6
770 110 7
880 110 8
990 110 9
1100 110 10
1210 110 11
1320 110 12
1430 110 13
1540 110 14
1650 110 15
Watts to Amps at 220V
Power (W) Voltage (V) Amps (A)
220 220 1
440 220 2
660 220 3
880 220 4
1100 220 5
1320 220 6
1540 220 7
1760 220 8
1980 220 9
2200 220 10
2420 220 11
2640 220 12
2860 220 13
3080 220 14
3300 220 15
Watts to Amps at 240V
Power (W) Voltage (V) Amps (A)
240 240 1
480 240 2
720 240 3
960 240 4
1200 240 5
1440 240 6
1680 240 7
1920 240 8
2160 240 9
2400 240 10
2640 240 11
2880 240 12
3120 240 13
3360 240 14
3600 240 15

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