How to use the Watts to Volts Calculator
The Formula
Voltage = watts ÷ amps: V = W ÷ A. If a load draws 1,800 W at 15 A, the system voltage is 120 V.
Practical Example
Useful when you know appliance wattage and measured current but need nominal circuit voltage, or when verifying inverter output.
About Watts to Volts Calculator
Watts to volts formula
Voltage = watts ÷ amps: V = W ÷ A. If a load draws 1,800 W at 15 A, the system voltage is 120 V.
When this helps
Useful when you know appliance wattage and measured current but need nominal circuit voltage, or when verifying inverter output.
Frequently asked questions
Q: Can current be zero? A: No—division by zero is undefined. Enter a positive current value.