Electricity cost calculator (kWh)

Enter the power of an appliance, the hours it runs and the price per unit to see the energy used and the cost.

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Questions students ask

What is a kilowatt-hour?

The energy used by a 1 kW appliance running for one hour, 3.6 million joules. It is the "unit" on electricity bills and tokens.

What formula does it use?

Energy (kWh) = power (kW) × time (h); cost = kWh × price per unit.

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