What does this tool do?
The kWh figure on a bill is power multiplied by time. This calculator converts rated watts and daily runtime into monthly energy, cost and annual consumption.
The Formula
kWh = Watts × Hours ÷ 1,000; Cost = kWh × Electricity rateFrequently Asked Questions
Does rated wattage reflect real use?
The label shows maximum draw. Appliances that cycle, such as fridges and ovens, average less than the rating, so treat the result as an upper estimate.
How do I find my electricity rate?
Divide the total bill by the kWh used on the same bill. That gives an all-in rate including fixed charges, which is usually higher than the advertised supply rate.