Start with an appliance, your usage and the price you pay per kWh.
Use the price you pay per kWh. Where to find it
No currency conversion. Include variable charges you want to model; fixed fees are separate.
No rate applied yet.
Use operating time, not just time plugged in. For a fridge, heater or variable-speed appliance, measured kWh or a suitable energy label is usually more useful.
Match the period printed on the label or recorded by your meter. An energy label describes test conditions.
Fractional cycles are fine: 2.5 per week means about five cycles every two weeks. Use the same programme as the energy figure.
Enter your rate and appliance details to see daily, monthly and annual energy costs.
Rated watts may be a maximum. Appliances with thermostats, compressors or variable speed rarely draw that power continuously.
A plug-in energy meter can capture operating and standby use over a representative period. Seasonal use still needs care.
If the label says kWh per 100 cycles, use the cycle input and the same test programme. Read the label guide.
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