Watts to Volts Calculator
To get volts you need both the watts and the amps: volts = watts ÷ amps. (Most of the time people actually want watts→amps at a known voltage — but if you have the current, this is the one.)
120 volts
1500 watts at 12.5 amps means about 120 volts.
Runs in your browser — nothing is sent anywhere. Estimates assume nominal voltage and ideal conditions; confirm with a licensed electrician and local code before sizing wire or breakers.
The formula
Divide the watts by the amps. Volts = Watts ÷ Amps.
Example: A 1,500-watt load drawing 12.5 amps: 1500 ÷ 12.5 = 120 volts — a standard outlet.
Common questions
- How do I find volts from watts?
- You need the current too: volts = watts ÷ amps. Watts alone can't give voltage.
- What's the voltage of a 1500W, 12.5A load?
- 1500 ÷ 12.5 = 120 volts — a standard US outlet.
- Isn't voltage usually fixed?
- Yes — in practice your supply is 120V or 240V, so most people want watts→amps at that voltage instead. Use this when you've measured current and want to confirm the voltage.