# Watts to Amps Calculator

Electric power in watts (W) to electric current in amps (A) calculator.

A
mA

Amps to watts calculator ►

* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12

## DC watts to amps calculation

So The current I in amps (A) is equal to the power  P in watts (W), divided by the voltage  V in volts (V).

I(A) = P(W) / V(V)

#### Example 1

What is the current in amps when the power consumption is 330 watts and the voltage supply is 120 volts?

I = 330W / 120V = 2.75A

#### Example 2

What is the current in amps when the power consumption is 330 watts and the voltage supply is 140 volts?

I = 330W / 140V = 2.35A

## AC single phase watts to amps calculation

So The phase current I in amps (A) is equal to the power  P in watts (W), divided by the power factor  PF times the RMS voltage  V in volts (V).

I(A) = P(W) / (PF × V(V))

So The power factor of resistive impedance load is equal to .

#### Example 1

What is the phase current in amps when the power consumption is 330 watts, the power factor is 0.8 and the RMS voltage supply is 120 volts?

I = 330W / (0.8 × 120V) = 3.4375A

#### Example 2

What is the phase current in amps when the power consumption is 330 watts, the power factor is 0.8 and the RMS voltage supply is 150 volts?

I = 330W / (0.8 × 150V) = 2.75A

## AC three phase watts to amps calculation

#### Calculation with line to line voltage

So The phase current I in amps (A) is equal to the power  P in watts (W), divided by square root of 3 times the power factor  PF times the line to line RMS voltage  VL-L in volts (V).

I(A) = P(W) / (3 × PF × VL-L(V) )

So The power factor of resistive impedance load is equal to .

##### Example 1

What is the phase current in amps when the power consumption is 330 watts, the power factor is 0.8 and the RMS voltage supply is 120 volts?

I = 330W / (3 × 0.8 × 120V) = 1.984A

##### Example 2

What is the phase current in amps when the power consumption is 330 watts, the power factor is 0.8 and the RMS voltage supply is 140 volts?

I = 330W / (3 × 0.8 × 140V) = 1.701A

#### Calculation with line to neutral voltage

So The phase current I in amps (A) is equal to the power  P in watts (W), divided by 3 times the power factor  PF times the line to neutral RMS voltage  VL-N in volts (V).

I(A) = P(W) / (3 × PF × VL-N(V) )

So The power factor of resistive impedance load is equal to .

## Typical power factor values

Do not use typical power factor values for accurate calculations.

Device Typical power factor
Fluorescent lamp 0.95
Incandescent lamp 1
Resistive oven 1
Synchronous motor 0.9

## Watts to amps table (120V)

Power (W) Voltage (V) Current (A)
10 watts 120 volts 0.0833 amps
20 watts 120 volts 0.167 amps
30 watts 120 volts 0.250 amps
40 watts 120 volts 0.333 amps
50 watts 120 volts 0.417 amps
60 watts 120 volts 0.500 amps
70 watts 120 volts 0.583 amps
80 watts 120 volts 0.667 amps
90 watts 120 volts 0.750 amps
100 watts 120 volts 0.833 amps
200 watts 120 volts 1.667 amps
300 watts 120 volts 2.500 amps
400 watts 120 volts 3.333 amps
500 watts 120 volts 4.167 amps
600 watts 120 volts 5.000 amps
700 watts 120 volts 5.833 amps
800 watts 120 volts 6.666 amps
900 watts 120 volts 7.500 amps
1000 watts 120 volts 8.333 amps

Watts to amps calculation ►

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