How to use this calculator
Use average operating power for a device that cycles on and off. Maximum nameplate power may overestimate a refrigerator’s actual consumption.
The estimate includes energy charges only. Add standing charges and taxes separately if they are not part of the price you entered. Variable tariffs require separate calculations for each period.
The formula
Energy (kWh) = watts ÷ 1000 × daily hours × days. Cost = energy × price per kWh.
A worked example
A 1,000 W appliance used two hours a day for 30 days consumes 60 kWh, costing 15 at 0.25/kWh.
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