Amps to Watts Conversion Calculator

Power in an electrical circuit represents the energy consumed by a load from a source per unit of time. The unit of measurement is the Watt [W]. Current reflects the amount of charge passing through a conductor per unit of time. It is measured in Amperes [A]. Voltage (potential difference) is measured in Volts [V].

To calculate the Amps / Watts ratio, Ohm's Law is used. Power is numerically equal to the product of the current flowing through the load and the voltage applied to it. The basic formula is: P = I × U.

Consequently, to determine power when the amperage is known, use the formula: W (Watts) = A (Amps) × V (Volts). For the reverse conversion (power to current), divide Watts by Volts. If the calculation is for a three-phase network (380V), a coefficient of √3 (approx. 1.73) must be taken into account.

How many Watts are in 1 Amp and Amps in a Watt?

To convert Watts to Amps for AC or DC voltage (for resistive loads), you need the formula:

I = P / U, where:

• I – current in Amps;
• P – power in Watts;
• U – voltage in Volts.

If the network is three-phase (380V), the formula is: I = P / (√3 × U).

Based on the formulas: one Watt is approximately 4.5 mA (1 A = 1000 mA) at 220 Volts and 0.083 A at 12 Volts.

When it is necessary to convert current to power (to find out how many Watts are in 1 Amp), apply the formula:

P = I × U (for 1 phase) or P = √3 × I × U (for 3 phases).

For example: in an automotive network (12V), 1 Amp is 12 Watts. In a domestic mains network (220V), a current of 1 A corresponds to a power of 220 W (0.22 kW). In an industrial 380 Volt network, this is about 657 Watts.

Amps – Watts Conversion Table

Why use the calculator

The online calculator allows you to quickly convert consumed current (Amps) into power (Watts) for any device at 12, 220, or 380 Volts.

This calculation is necessary when selecting a generator, a car battery, or when installing home wiring and choosing circuit breakers. With the calculator, you can sum the power of all electrical components to understand the total load on the network.

How to use

To use the quick conversion tool and recalculate Amps to Watts:

1. Enter the network voltage value.
2. Specify the consumed current value (you can choose Amps or mA).
3. The conversion result will appear in the adjacent field (default is in Watts, but can be switched to kW).

The conversion works both ways: enter the power of the device to find out the amperage.

Frequently Asked Questions

• How many Watts in an Amp?

  In an automotive network (12V), 1 Amp = 12 Watts. In a domestic mains network (220V), 1 Amp equals 220 Watts. In a three-phase 380 Volt network, 1 Amp corresponds to approximately 657 Watts (with a resistive load).

• How many Watts is 12 Amps?

  Power at 12 Amps depends on the voltage: in a 12V network, it is 144 W; in a 220V network – 2640 W; in a 380V network – about 7890 W.

• How many Amps is 220 Watts?

  Current for a 220 Watt consumer: about 18 A at 12 Volts; 1 A in a 220 Volt network; and about 0.33 A in a three-phase 380 Volt network.

• How many Watts is 5 Amps?

  We use the formula P = I × U. At 12V, this is 60 W. At 220V, the power will be 1100 W. In a three-phase 380V network, a current of 5 A corresponds to a power of approximately 3290 W.