Skip to main navigation.

Appliance Power Costs

To calculate the wattage for any appliance, use the formulas below:

Most appliances and other electrical equipment have a nameplate that indicates the power requirements.

For single phase equipment (any residential equipment):

Watts = volts x amps

For three phase equipment (found in some commercial and most industrial equipment):

Watts = volts x amps x 1.732 (1.732 is the square root of 3)


To determine the cost of running an appliance, use these formulas:

Wattage x Hours Used / 1000 = kWh

kWh x cost of electricity = cost

Powered by Touchstone Energy Cooperatives Logo