Watts To Amps Calculator

Watts To Amps Conversion Calculator

Watts Volts Amps

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
Sample Question:

Here is how we can calculate watt to amp. How many amps is 500W?

Solution :
I = P/V

If we input the P = 500 Watts and V = 120 Volts, we get:

I = 500 Watts/120 Volt = 4.17 Amps
Watts: Amps (at 24V):
1 Watt to amps at 24V: 42 mA (milliamps)
10 Watts to amps at 24V: 420 mA
50 Watts to amps at 24V: 2.08 Amps
100 Watts to amps at 24V: 4.17 Amps
200 Watts to amps at 24V: 8.33 Amps
300 Watts to amps at 24V: 12.50 Amps
400 Watts to amps at 24V: 16.67 Amps
500 Watts to amps at 24V: 20.83 Amps
600 Watts to amps at 24V: 25.00 Amps

Simple WATT - AMP - VOLT Formula

Converting watts to amps can be done using the power formula, which states that I = P / E, where P is power measured in watts, I is current measured in amps, and E is voltage measured in volts.

Watts = Amps x Volts

Volt = Watts / Amps

Amps = Watts / Volts

Each of these quantities are measured using different units:

For example, find the amperage of 1200 watts at 120 volts

current = power / voltage
current = 1200W / 120V
current = 10A

AC and DC power systems

The labels AC and DC are used to describe the types of current flow in a circuit. For direct current (DC) the electric current flows only in one direction. However, in alternating current (AC) the electric current changes direction at several times per second.

Single-Phase AC Circuit Watts to Amps Conversion

Converting watts to amps for a single-phase AC circuit with power factor uses a slightly different formula.

I(A) = P(W) / V(V) × PF

Three-Phase AC Circuit Watts to Amps Conversion

Using Line to Line Voltage

For three-phase AC circuits where the line to line voltage is known, the formula to convert watts to amps is:

I(A) = P(W) / VL-L(V) × PF × √3

The current I in amps is equal to the power P in watts divided by the line to line voltage V in volts multiplied by the power factor PF multiplied by the square root of 3.

Using Line to Neutral Voltage

For three-phase AC circuits where the line to neutral voltage is known, the formula to convert watts to amps is:

I(A) = P(W) / VL-N(V) × PF × 3

The current I in amps is equal to the power P in watts divided by the voltage V in volts multiplied by the power factor PF multiplied by 3.

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