Convert voltage (V) and current (A) to power in watts (W) instantly using P = V × I
Converting voltage (V) and current (A) to power in watts (W) is a fundamental electrical calculation. The relationship is given by the power formula: P = V × I, where P is power in watts, V is voltage in volts, and I is current in amperes. This formula applies to DC circuits and resistive AC circuits. Our free Volts to Watts calculator makes this conversion quick and easy, providing instant and accurate results.
The formula P = V × I is one of the most basic in electrical engineering. Voltage represents the electrical potential difference that drives current through a circuit; current is the flow of electric charge. Multiplying them gives the rate at which energy is consumed or delivered—power in watts. For example, 230 V and 10 A give P = 230 × 10 = 2300 W (2.3 kW). For AC circuits with reactive components, power factor may be needed; for simple resistive loads, P = V × I is sufficient.
This conversion is used in many applications: calculating power consumption of devices, sizing circuit breakers and wiring, designing electrical circuits, determining load requirements, and understanding electrical system behavior. Whether you work with residential, commercial, or industrial systems, converting volts and amps to watts is essential for safe and efficient electrical design.
Our calculator takes voltage and current as inputs, applies P = V × I, and displays the result in watts. No registration required. Whether you're a student, electrician, or engineer, the Volts to Watts calculator delivers accurate results for your electrical calculations.
230 V and 5 A gives P = 230 × 5 = 1150 W. 120 V and 10 A gives P = 1200 W. 24 V and 2 A gives P = 48 W. A 230 V appliance drawing 4.35 A consumes 230 × 4.35 ≈ 1000 W (1 kW).