Appliance running-cost worksheet

Estimate electricity use for a scenario you define by entering power, operating time and your own tariff. Record whether the wattage is a measured average, a stated rating or another assumption. Keep that distinction visible because the calculation treats the entered power as constant while the appliance is running.

Choose the number of days and hours of operation for this comparison, then record the tariff source and check date. The result covers only the electricity represented by those inputs. It does not predict cycling behaviour, future tariff changes or other household charges, and it does not claim that one appliance will perform better.

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This tool does not save your entries automatically. Download a copy to keep your work, and clear the worksheet on a shared device before leaving. Do not enter passwords, account numbers or other sensitive personal information.

Power and operating pattern

Use the exact appliance and operating mode covered by your assumption.

Appliance model and mode

Assumed power while operating, watts

Power basis

Assumed operating hours per day

Number of days in the scenario

Enter your tariff

Copy your own applicable unit rate; no live tariff is supplied.

Electricity unit rate, pence per kWh

Use the rate applicable to this scenario and record whether applicable tax is included.

Tariff source and date checked

Time-of-use or other conditions and tax basis

Record limitations

Identify assumptions the constant-power calculation does not model.

Power observation or official source and check date

Cycling, standby or varying-power behaviour not represented

Charges excluded from the calculation

Using your worksheet

Use a measured average when available and label a rated wattage used as a scenario assumption.
Enter only hours during which the stated power assumption applies.
For different power modes or tariff periods, calculate separate scenarios rather than averaging them silently.
Use the result as a cost estimate alongside the recorded power and tariff basis.

Assumptions and limits

Constant power and one unchanged unit rate are assumed for the selected operating hours.

Standing charges and other household costs are excluded unless represented in a separate comparison.

The worksheet supplies no tariff, efficiency, health or appliance-performance claim.