Watts to Volts Calculator
Convert watts to volts using either the current (V = W ÷ A) or the resistance (V = √(W × R)), for DC, single-phase, and three-phase. WattSimple also names the nearest standard US system voltage, so you can tell straight away whether the answer describes a real circuit.
Watts alone do not set a voltage — a 1,500 W load is 1,500 W whether it runs on 120 V or 240 V. You need the current or the resistance to pin the voltage down. In practice you rarely calculate a supply voltage; you read it off the system and use it to find the current instead.
Voltage
120 V
- Power
- 1,500 W
- Current
- 12.5 A
- In kilowatts
- 1.5 kW
Nearest standard system voltage
120 V — standard receptacle / lighting — your result is +0% from 120 V.
A result far from every nominal voltage usually means the current or resistance figure is off. Utilization equipment is built to tolerate roughly ±5% of nominal (ANSI C84.1 Range A).
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Open converterSources & standards
This tool's methodology and data follow US standards and authoritative public datasets: